⚙ ADMIN
🔓 Upgrade to Premium
GeoLearn
Japan
Japan
地質・地盤工学学習システム
Master Geotechnical & Geophysical Engineering for Japanese licensing. 22 interactive topics — including full modules for Borehole Camera, Pressuremeter, GPR, Plate Load Test & RQD — plus animations, field calculators, and exam prep.
MYO NAING TUN / MYO_Geo_Orgs
© 2026 All Rights Reserved · Proprietary Software
© 2026 All Rights Reserved · Proprietary Software
22
Topics
60
Flashcards
75
Quiz Questions
—
Best Quiz Score
// STUDY TIMER
00:00:00
// LICENSE TARGETS 資格目標
🔭
現場調査技術者
Field Investigation Engineer
0% Coverage
→ Open Roadmap
📋
地質調査技士
Geological Survey Engineer
0% Coverage
→ Open Roadmap
🌊
物理探査技士
Geophysical Exploration Engineer
0% Coverage
→ Open Roadmap
🎓
技術士補
Associate Professional Engineer
0% Coverage
→ Open Roadmap
🏆
技術士
Professional Engineer
0% Coverage
→ Open Roadmap
Study Modules
// 学習モジュール — Select a topic to begin
// SOIL MECHANICS 土質力学
Effective Stress
有効応力
The stress carried by the soil skeleton. Foundation of all soil strength analysis.
σ' = σ - u
Shear Strength
せん断強さ
Mohr-Coulomb criterion. Controls slope stability, bearing capacity, and retaining walls.
τ = c' + σ'tanφ'
Consolidation
圧密
Time-dependent compression of saturated clay. Terzaghi 1D consolidation theory.
Tv = cv·t/H²
Liquefaction
液状化
Saturated loose sand loses strength during earthquake. Critical for Japanese construction.
FL = Rl/L
// WAVE PROPAGATION 波動伝播
P-Wave (Primary)
P波（縦波）
Compressional wave. Travels through solids and liquids. Used in seismic refraction surveys.
Vp = √(M/ρ)
S-Wave (Shear)
S波（横波）
Shear wave. Cannot travel through liquids. Key for Vs30 calculation and site amplification.
Vs = √(G/ρ)
Vs30 & Site Class
地盤種別
Average shear wave velocity in top 30m. Japanese seismic design classification.
Vs30 = 30/Σ(hi/Vsi)
// IN-SITU TESTING 原位置試験
SPT (Standard Penetration Test)
標準貫入試験
N-value from 63.5kg hammer drop. Most common soil investigation in Japan.
N60 = N·(ER/60)
CPTu (Cone Penetration Test)
コーン貫入試験
Continuous profile of tip resistance, sleeve friction, and pore pressure.
Ic = √((3.47-log Qt)²+...)
PS Logging
PS検層
Downhole or crosshole measurement of P and S wave velocities in borehole.
Vs = d/Δt
// GEOPHYSICAL METHODS 物理探査
Seismic Refraction
屈折法地震探査
Surface seismic method mapping velocity layers. Uses first arrival times.
t = x/V1 + 2h·cosθc/V1
Electrical Resistivity Survey
電気探査
Wenner, Schlumberger, dipole-dipole arrays. Map subsurface resistivity variations.
ρ = 2πa·(V/I)
MASW Surface Wave Survey
表面波探査・微動探査
Surface wave analysis for Vs profiling. MASW and H/V spectral ratio methods.
Vs(z) from dispersion
Ground Penetrating Radar
地中レーダー探査
Electromagnetic pulses detect shallow features: voids, utilities, bedrock, buried objects.
d = v·t/2
// BOREHOLE INVESTIGATION 孔内調査
Borehole Camera
孔内カメラ
Visual inspection of borehole walls. Reveals fractures, joints, weathering, groundwater inflow.
Fracture orientation & RQD
Pressuremeter Test
孔内水平載荷試験
Inflatable probe measures lateral stress-strain in borehole. Gives Em and limit pressure PL.
Em = 2(1+ν)·V·ΔP/ΔV
Rock Quality Designation (RQD)
岩盤品質指標
Core-based index of rock mass quality. Foundation of RMR and Q-system classification.
RQD = Σ(≥100mm)/L × 100%
// LOAD TESTING 載荷試験
Plate Load Test
平板載荷試験
Direct measurement of bearing capacity and settlement modulus at foundation level. JIS A 1215.
K30 = p/s · (1/0.125)
CPTu (Cone Penetration Test)
コーン貫入試験
Continuous profile of tip resistance, sleeve friction, and pore pressure.
Ic = √((3.47-log Qt)²+...)
SPT (Standard Penetration Test)
標準貫入試験
N-value from 63.5 kg hammer drop. Most common soil investigation in Japan.
N60 = N·(ER/60)
Engineering Animations
// インタラクティブアニメーション
Field Test Calculator
// 原位置試験インタープリター
🔨 SPT Analysis
📡 Vs30 Calculator
💧 Liquefaction FL
🏗 Bearing Capacity
⚙️ SPT N-value Correction
Field N-value (実測N値)
Overburden Stress σ'v (kPa)
Energy Ratio ER (%)
Fines Content FC (%)
N₆₀ (energy corrected)—
(N₁)₆₀ (stress norm.)—
(N₁)₆₀cs (clean sand)—
Soil Classification—
Relative Density Dr (%)—
Bearing Capacity (kPa)—
📊 Soil Profile Visualization
Click "Add Layer" to build a soil column profile
Flashcards
// フラッシュカード — Spaced Repetition Learning
0
Studied Today
0%
Accuracy
0
Day Streak
0
Mastered
All
Soil
Foundation
Earthquake
Geophysics
Investigation
👆 tap to reveal answer
1 / 40
Quiz System
// クイズ — Test your knowledge
⚡
Ready to Test?
60 questions across all topics. Choose your category.
Memory Match
// マッチングゲーム — Match terms to definitions
0
Score
0
Matches
0
Attempts
0s
Time
Resource Library
// 参考文献・リソース
// FREE TEXTBOOKS & LECTURES
MIT OCW — Advanced Soil Mechanics
Complete graduate course with lecture notes, PDFs covering consolidation, shear strength, permeability, slope stability.
ocw.mit.edu/courses/1-361-advanced-soil-mechanics-fall-2004/
Open ↗
Free Geotechnical Engineering PDFs
Collection of free geotechnical engineering books covering soil mechanics, foundations, and geotechnics.
infobooks.org/free-pdf-books/engineering/geotechnical-engineering/
Open ↗
// PROFESSIONAL ORGANIZATIONS 学会
地盤工学会 (JGS)
Japanese Geotechnical Society. Primary organization for geotechnical engineering in Japan.
jiban.or.jp
Open ↗
Society of Exploration Geophysicists
International organization. Papers, resources on seismic, EM, and geophysical methods.
seg.org
Open ↗
物理探査学会 (SEGJ)
Japanese Society of Exploration Geophysics. Key for 物理探査技士 license resources.
segj.org
Open ↗
// JAPANESE STANDARDS 基準・規格
📋 Key Japanese Standards
JIS A 1219標準貫入試験 SPT
JIS A 1220ロータリーボーリング
JGS 0121液状化強度試験
JGS 3511PS検層
道路橋示方書Road Bridge Specification
建築基礎構造設計指針Architectural Foundation Design
🔬 Key Seismic Design References
地震動予測地図Seismic Hazard Map (NIED)
告示1457号Site amplification classification
ISO 22476Geotechnical Investigation
Vs30分類Shear velocity site classes
液状化判定法FL method (道路橋示方書)
Career Roadmap
// キャリアロードマップ — Japan Geotechnical Career Path
🔭
STAGE 01
Field Investigation Engineer
現場調査技術者
Entry-level role conducting boreholes, SPT, CPT, and sampling. Works under supervision on site investigation projects.
¥250,000–350,000 /month
SPT Operation / SPT操作
Soil Logging / 地質柱状図記録
Safety Management / 安全管理
AUTOCAD Basic / AutoCAD基礎
→ Open Study Roadmap
📋
STAGE 02
地質調査技士 Certified
Geological Survey Engineer License
Licensed field supervisor for geological investigations. Leads site investigation teams. Required for public works contracts in Japan.
¥350,000–480,000 /month
地質調査技士 License
Borehole Supervision
地盤調査
Report Writing
→ Open Study Roadmap
🌊
STAGE 03
物理探査技士 Certified
Geophysical Exploration Engineer License
Specialist in seismic surveys, PS logging, microtremor, and electrical resistivity. Processes geophysical data and produces interpretations.
¥400,000–550,000 /month
物理探査技士 License
MASW / Refraction
PS検層
Data Processing
SeisImager / ReSIS
→ Open Study Roadmap
🎓
STAGE 04
技術士補 Associate Professional
Junior Professional Engineer (JABEE / PE Exam Part I)
First step toward full 技術士 license. Demonstrates fundamental engineering competence. Required experience accumulation period begins.
¥420,000–580,000 /month
技術士補
Foundation Design
Liquefaction Analysis
Project Management
→ Open Study Roadmap
🏆
STAGE 05
技術士 Professional Engineer
Geotechnical / Geophysical Professional Engineer
Top-level Japanese engineering license. Independent practice rights. Senior technical reviewer for major infrastructure projects nationwide.
¥600,000–900,000+ /month
技術士 License
Expert Witness
Research & Development
International Work
Risk Assessment
→ Open Study Roadmap
現場調査技術者 Roadmap
// Field Investigation Engineer Roadmap — 現場調査技術者ロードマップ
← Career Roadmap
🔭 Stage 01 — Entry Level / 初級
Field Investigation Engineer
現場調査技術者
現場調査技術者
Japan's entry-level geotechnical field role. Conducts boreholes, SPT, CPT, and soil sampling under licensed supervision. This roadmap guides you from zero experience to field-ready professional practice. / 日本の地盤工学入門現場職種。ボーリング、SPT、CPT、土質試料採取を資格技術者の監督のもとで行います。
Learning Progress / 学習の進捗
0 / 18 tasks done
0%
Check off tasks below to track your progress / 以下のタスクにチェックを入れて進捗を記録
1 — Role Overview / 職種概要
What a 現場調査技術者 does in Japan / 日本での現場調査技術者の役割
▶
A 現場調査技術者 (Field Investigation Engineer) is an entry-level geotechnical professional who performs ground investigation work under the supervision of a licensed engineer. This role is the foundation of Japan's geotechnical industry — every major construction project begins with field investigation.
現場調査技術者は、資格を持つ技術者の監督のもとで地盤調査業務を行う初級地盤技術者です。この役割は日本の地盤工学産業の基盤であり、すべての主要建設プロジェクトは現場調査から始まります。
CORE FIELD RESPONSIBILITIES / 主要現場業務
Borehole Operations / ボーリング操作
- Set up and operate drilling equipment / 削孔機器の設置・操作
- Monitor borehole depth and diameter / ボーリング深度・径の管理
- Record drilling parameters / 削孔パラメータの記録
- Maintain casing and core recovery / ケーシングとコア回収の管理
SPT & CPT Testing / SPT・CPT試験
- Perform Standard Penetration Tests / 標準貫入試験の実施
- Count and record N-values / N値の計測・記録
- Operate Cone Penetration Tests / コーン貫入試験の操作
- Calibrate test equipment / 試験機器の校正
Soil Sampling / 土質試料採取
- Collect disturbed and undisturbed samples / 乱した・乱さない試料の採取
- Label and store samples correctly / 試料の正確なラベル・保管
- Describe soil color and texture / 土の色・組織の記述
- Transport samples to laboratory / 試料の実験室への搬送
Field Documentation / 現場記録
- Complete daily field log sheets / 現場日誌の記録
- Sketch borehole column diagrams / ボーリング柱状図のスケッチ
- Record groundwater levels / 地下水位の記録
- Photograph site conditions / 現場状況の写真撮影
Site Safety / 現場安全管理
- Follow site safety protocols / 現場安全規則の遵守
- Use personal protective equipment / 保護具の着用
- Identify and avoid hazards / 危険の特定・回避
- Report incidents immediately / 事故の即時報告
Equipment Care / 機器管理
- Clean and maintain field tools / 現場工具の清掃・整備
- Check equipment before use / 使用前の機器点検
- Report equipment faults / 機器の不具合報告
- Store equipment safely / 機器の安全な保管
LEARNING TASKS / 学習タスク
2 — SPT Operation / 標準貫入試験操作
Standard Penetration Test procedures and N-value recording / 標準貫入試験手順とN値記録
▶
The Standard Penetration Test (SPT / 標準貫入試験) is the most commonly used in-situ test in Japan. It measures the number of hammer blows (N-value / N値) required to drive a split-spoon sampler 300mm into soil. The N-value directly correlates with soil density, bearing capacity, and liquefaction resistance.
標準貫入試験（SPT）は日本で最もよく使われる原位置試験です。スプリットスプーンサンプラーを土中に300mm貫入させるために必要なハンマー打撃回数（N値）を測定します。N値は土の密度、支持力、液状化抵抗と直接相関します。
INTERACTIVE TOOLS / インタラクティブツール
🎬
ANIMATION
Watch SPT hammer drop & N-value counting in real time
→ Open Animations ▶
📊
FIELD DATA LAB
Interpret a real 10-layer SPT borehole log with soil classification
→ Open SPT Log ▶
🧮
FIELD CALCULATOR
Compute N₆₀, (N₁)₆₀, Dr, bearing capacity & liquefaction FL
→ Open SPT Calculator ▶
TEST PROCEDURE / 試験手順 (JIS A 1219)
1
Borehole Preparation / ボーリング孔の準備
Advance borehole to test depth using rotary drilling. Flush cuttings and stabilise the borehole. Lower the split-spoon sampler on drill rods to the bottom. / 回転削孔で試験深度まで掘進。削り屑を洗い流し、孔壁を安定させる。スプリットスプーンサンプラーをドリルロッドで孔底まで降下。
2
Seating Drive / 予備打ち (150 mm — not counted)
Drop the 63.5 kg hammer from 760 mm to drive the sampler 150 mm. This seating phase seats the sampler past disturbed material and is NOT included in the N-value. / 63.5kgハンマーを760mm落下させてサンプラーを150mm貫入。この予備打ちはN値に含まない。
3
Main Drive — N-value Recording / 本打ち・N値記録
Drive sampler through two 150 mm intervals (total 300 mm). Count blows per 150 mm and record as N₁ + N₂. N-value = N₁ + N₂. If 50 blows < 300 mm penetration → record as "50/Xmm" (refusal). / サンプラーを150mm×2区間（計300mm）打撃。各区間の打撃数を記録。N値 = N₁ + N₂。50回打撃で300mm未達の場合→「50/Xmm」と記録（貫入不能）。
4
Sample Recovery & Description / 試料回収・記述
Retrieve split-spoon sampler. Open it and describe the soil: colour (色調), texture (粒度), consistency (コンシステンシー), odour. Place soil in a labelled sample jar for lab testing. / サンプラーを回収・開口し、土質を記述。色調、粒度、コンシステンシー、臭気を記録。ラベル付き試料瓶に入れて室内試験へ。
5
Advance & Repeat / 掘進・繰り返し
Re-attach drill rods, advance borehole to next 1 m depth interval, repeat from Step 1. Standard intervals: every 1 m in Japan (JIS A 1219). N-values are plotted vs depth to create the borehole log. / ドリルロッドを再接続し、次の1m深度まで掘進して手順1から繰り返す。日本の標準間隔：1mごと（JIS A 1219）。N値を深度に対してプロットして柱状図を作成。
EQUIPMENT & TERMINOLOGY / 機器と用語
| Japanese / 日本語 | English | Spec / Description |
|---|---|---|
| 標準貫入試験 | Standard Penetration Test | JIS A 1219 — Japan's primary in-situ test / 主要な原位置試験 |
| N値 | N-value / Blow Count | Blows for 300 mm penetration (N₁+N₂) / 300mm貫入打撃回数 |
| スプリットスプーン | Split-spoon Sampler | OD 51 mm, ID 35 mm, length 812 mm / 外径51mm、内径35mm |
| ハンマー重量 | Hammer Weight | 63.5 kg (±0.5 kg) / 63.5kgドロップハンマー |
| 落下高 | Drop Height | 760 mm free fall / 760mm自由落下 |
| 予備打ち | Seating Drive | First 150 mm — excluded from N-value / 最初の150mm（N値除外） |
| 本打ち | Main Drive | Next 300 mm (2×150 mm) — N = N₁+N₂ / 次の300mm |
| 貫入不能 | Refusal | 50 blows < 300 mm penetration → record 50/Xmm / 50回で300mm未満 |
| エネルギー効率 | Energy Ratio (ER) | Japan donut hammer ER≈72% → correction to N₆₀ / 日本のドーナツ型ER≈72% |
| N₆₀ 補正値 | Corrected N₆₀ | N₆₀ = N×(ER/60) — standard energy correction / 標準エネルギー補正 |
| 上載圧補正 | Overburden Correction | (N₁)₆₀ = N₆₀×Cₙ, Cₙ=√(100/σ'ᵥ) / 有効土被り圧補正 |
| 地下水位 | Groundwater Level (GWL) | Depth to water table — affects σ'ᵥ and liquefaction / 地下水面深度 |
N-VALUE INTERPRETATION / N値の解釈
N-VALUE CORRECTIONS / N値補正式
① Energy Correction / エネルギー補正
N₆₀ = N × (ER / 60)
Japan donut hammer: ER ≈ 72%
日本ドーナツ型ハンマー：ER≈72%
日本ドーナツ型ハンマー：ER≈72%
② Overburden Correction / 上載圧補正
(N₁)₆₀ = N₆₀ × Cₙ
Cₙ = min(1.7, √(100/σ'ᵥ))
Cₙ = min(1.7, √(100/σ'ᵥ))
σ'ᵥ = effective vertical stress (kPa)
有効鉛直応力（kPa）
有効鉛直応力（kPa）
③ Fines Correction / 細粒分補正
(N₁)₆₀cs = (N₁)₆₀ + ΔN
ΔN = f(FC%)
ΔN = f(FC%)
FC = fines content (%) — for liquefaction
細粒分含有率（液状化判定用）
細粒分含有率（液状化判定用）
④ Liquefaction Check / 液状化判定
FL = CRR₇.₅ × MSF / CSR
FL < 1.0 → liquefaction likely
FL < 1.0 → 液状化の可能性あり
FL < 1.0 → 液状化の可能性あり
💡 Tip: Use the Field Calculator → SPT Analysis tab to compute all corrections automatically. / フィールド計算機→SPT解析タブで自動計算できます。
LEARNING TASKS / 学習タスク
3 — Soil Logging / 地質柱状図記録
Field classification and borehole log preparation / 現場分類とボーリング柱状図の作成
▶
Soil Logging (地質柱状図記録) is the process of visually examining and describing recovered soil samples to create a borehole log (柱状図). This is a critical skill — accurate logs are the foundation of all geotechnical analysis and design.
土質記録（地質柱状図記録）は、回収された土試料を目視で検査・記述してボーリング柱状図を作成するプロセスです。正確な柱状図はすべての地盤工学的分析と設計の基盤となります。
| Japanese / 日本語 | English | Description / 説明 |
|---|---|---|
| 柱状図 | Borehole Log | Graphical record of soil layers / 土層のグラフィック記録 |
| 土質分類 | Soil Classification | Identifying soil type and properties / 土の種類と性質の特定 |
| 粒度 | Grain Size | Particle size distribution / 粒子サイズの分布 |
| 色調 | Soil Color | Munsell color notation used in Japan / 日本ではマンセル記号使用 |
| コンシステンシー | Consistency | Stiffness of cohesive soils / 粘性土の硬さ |
| 地層境界 | Stratigraphic Boundary | Depth where soil type changes / 土質が変化する深度 |
LEARNING TASKS / 学習タスク
4 — Safety Management / 安全管理
Construction site safety in Japan / 日本の建設現場の安全
▶
Safety Management (安全管理) is mandatory on all Japanese construction sites. Japan's Labour Safety and Health Act (労働安全衛生法) sets strict requirements for site safety. Field investigation engineers must know these rules before starting any work.
安全管理は日本のすべての建設現場で義務付けられています。労働安全衛生法は現場安全に対して厳格な要件を設けています。現場調査技術者は作業開始前にこれらの規則を知っておく必要があります。
| Japanese / 日本語 | English | Description / 説明 |
|---|---|---|
| 労働安全衛生法 | Labour Safety and Health Act | Japan's main workplace safety law / 日本の主要な職場安全法 |
| 保護具 | Personal Protective Equipment | Hard hat, gloves, boots required / ヘルメット・手袋・安全靴が必要 |
| 危険予知 | Hazard Identification (KY) | Pre-work hazard assessment / 作業前危険予知活動 |
| 作業手順書 | Work Procedure Manual | Step-by-step safety procedures / 段階的安全手順 |
| 緊急連絡先 | Emergency Contacts | Site emergency reporting chain / 現場緊急連絡体制 |
| ヒヤリハット | Near-Miss Report | Mandatory incident reporting / 義務的なインシデント報告 |
LEARNING TASKS / 学習タスク
5 — AutoCAD Basic / AutoCAD基礎
Drawing tools for field reports and borehole logs / 現場報告書・柱状図の作成ツール
▶
AutoCAD is the standard drawing software used in Japanese geotechnical firms to produce borehole logs (柱状図), site plans (配置図), and geological cross-sections (地質断面図). Entry-level engineers are expected to assist with basic drafting tasks.
AutoCADは日本の地盤工学会社でボーリング柱状図、配置図、地質断面図を作成するために使用される標準製図ソフトウェアです。初級技術者は基本的な製図業務を補助することが期待されます。
| Japanese / 日本語 | English | Description / 説明 |
|---|---|---|
| 柱状図 | Borehole Column Diagram | Graphical soil layer diagram / 土層のグラフィック図面 |
| 配置図 | Site Layout Plan | Plan view of borehole locations / ボーリング位置の平面図 |
| 地質断面図 | Geological Cross-Section | Side view of soil layers / 土層の側面図 |
| レイヤー | Layer | Drawing layer management / 図面レイヤー管理 |
| 縮尺 | Scale | Drawing scale (1:100, 1:200, etc.) / 図面の縮尺 |
| ブロック | Block | Reusable symbol library / 再利用可能なシンボルライブラリ |
LEARNING TASKS / 学習タスク
6 — Career Progression / キャリアアップ
Path to Stage 02 — 地質調査技士 Certification / 地質調査技士資格への道
▶
After gaining 2–3 years of field experience as a 現場調査技術者, you can sit for the 地質調査技士 (Geological Survey Engineer) national examination. This license is required to independently supervise ground investigation for public works contracts.
現場調査技術者として2〜3年の現場経験を積んだ後、地質調査技士の国家試験を受験できます。この資格は公共工事契約での地盤調査を独立して監督するために必要です。
Requirements for Stage 02 / Stage 02の要件
- 2+ years field experience / 2年以上の現場経験
- Pass 地質調査技士 written exam / 地質調査技士筆記試験合格
- Pass practical assessment / 実技審査合格
- JGSEE membership / JGSEE会員
Skills to Develop / 習得すべきスキル
- Independent borehole logging / 独立したボーリング記録
- Report writing in Japanese / 日本語での報告書作成
- 地盤調査 planning skills / 地盤調査計画能力
- Team leadership basics / チームリーダーシップの基礎
→ Next Step: Open the 地質調査技士 Roadmap to see Stage 02 in detail.
→ 次のステップ：地質調査技士ロードマップを開いてStage 02の詳細をご覧ください。
→ 次のステップ：地質調査技士ロードマップを開いてStage 02の詳細をご覧ください。
LEARNING TASKS / 学習タスク
地質調査技士 Roadmap
// Professional Field Engineer Roadmap for Japan — 地質調査技士資格ロードマップ
← Career Roadmap
📋 JGSEE Certification
Geological Survey Engineer
地質調査技士
地質調査技士
Japan's national license for geological field investigation. Required for supervising ground investigation on public works projects. This roadmap guides foreign engineers from fundamentals to exam-ready professional practice.
Learning Progress
0 / 19 tasks done
0%
Check off tasks in the Learning Roadmap below to track your progress
1 — Purpose of the Profession
What a 地質調査技士 actually does in Japan
▶
A 地質調査技士 (Geological Survey Engineer) is a licensed field professional who leads and supervises geological ground investigations throughout Japan. This engineer is the technical authority on site — responsible for data quality, safety, and accurate interpretation of subsurface conditions.
CORE FIELD RESPONSIBILITIES
Ground Investigation
- Supervise boring drilling operations
- Monitor drilling parameters and progress
- Record drilling fluid conditions
- Ensure investigation meets design spec
Boring Supervision
- Oversee equipment setup and operation
- Verify borehole depth and alignment
- Direct SPT and sampling procedures
- Maintain drilling records and N-values
Geological Logging
- Classify soil and rock samples on site
- Draw 地質柱状図 (borehole logs)
- Identify stratigraphic boundaries
- Describe color, texture, consistency
Soil Testing
- Direct in-situ test procedures (SPT, CPT)
- Collect undisturbed samples for lab tests
- Measure and record groundwater levels
- Conduct plate load tests if required
Groundwater Observation
- Install observation pipes in boreholes
- Record water level during and after drilling
- Identify artesian or confined conditions
- Monitor water rise after drilling stops
Investigation Reports
- Compile 調査報告書 (investigation reports)
- Draw geological cross sections
- Summarize investigation findings
- Provide engineering recommendations
HOW THIS WORK SUPPORTS JAPAN'S INFRASTRUCTURE
Building Foundations
建物基礎
Tunnel Construction
トンネル工事
Slope Stability
斜面安定
Earthquake Safety
耐震安全性
License Categories: The 地質調査技士 exam has three categories — Surface Investigation (表層地質調査), Boring Investigation (ボーリング調査), and Physical Exploration (物理探査). The Boring Investigation category is the most common entry point for field engineers.
2 — Real Daily Work on Site
Typical workflow of a geological investigation engineer
▶
Field geological investigation in Japan follows a disciplined daily structure. Understanding this workflow will help you perform confidently on any 地盤調査 project.
🌅
MORNING — 朝
- Safety meeting (朝礼 · chōrei) — attendance, hazard briefing, day's plan
- Inspect drilling equipment — check rig, rods, casing, hammer condition
- Confirm investigation plan (調査計画) — borehole depth, test intervals, sampling depths
- Mark borehole positions and set up cordoned safety perimeter
- Verify PPE: safety helmet, vest, steel-toed boots, gloves
🔩
FIELD WORK — 作業中
- Monitor boring drilling progress (ボーリング掘削) — depth, speed, drill fluid return
- Perform Standard Penetration Test (標準貫入試験 · N値) at required depth intervals
- Collect soil samples (試料採取) — disturbed split-spoon or undisturbed thin-wall tube
- Record groundwater level (地下水位測定) when drilling pauses
- Perform in-situ tests as required — vane shear, piezocone, pressure meter
- Photograph soil samples and record observations in field notebook
📋
AFTERNOON / END OF DAY — 午後
- Geological logging (地質柱状図作成) — classify and describe all samples from the day
- Compile borehole log data (ボーリング柱状図) — depth, N-value, soil type, water level
- Label and store soil samples for laboratory transport
- Write daily site report (日報) and share with project supervisor
- Site cleanup, equipment maintenance, safety sign-off
Key Tip: On Japanese sites, the 朝礼 is a formal daily ritual — not optional. Always attend, stand in line, and participate. This shows professional discipline (職業的誠実さ) and is critical for team trust.
3 — Japanese Technical Vocabulary
Essential terms for daily site communication
▶
Master these terms to communicate professionally on Japanese investigation sites. Grouped by usage context.
| Japanese / Reading | English | Field Usage |
|---|---|---|
| ボーリング調査bōringu chōsa | Boring Investigation | Drilling ground to investigate subsurface soil and rock layers |
| 標準貫入試験hyōjun kannyū shiken | Standard Penetration Test (SPT) | Hammer-driven soil strength test — N-value is the hit count per 30 cm |
| コア採取koa saishu | Core Sampling | Collecting cylindrical rock/soil samples from the borehole |
| 地層chisō | Soil / Rock Layer | Natural underground stratigraphy — you identify layers during logging |
| 地下水位chikasui-i | Groundwater Level | Water level inside borehole — measured when drilling stops |
| 地質柱状図chishitsu chūjōzu | Borehole Log | Drawn record of soil layers, N-values, and sample depths along a borehole |
| 斜面安定shamen antei | Slope Stability | Stability analysis of slopes — investigation targets weak layers and groundwater |
| 試料採取shiryō saishu | Sample Collection | Collecting soil/rock samples at specified depths for field or lab analysis |
| 地盤調査jiban chōsa | Ground Investigation | General term for subsurface investigation — covers boring, testing, and reporting |
| 不攪乱試料fu-kakuran shiryō | Undisturbed Sample | Sample collected without disturbing natural structure — used for lab strength tests |
| 圧密試験atsumitsu shiken | Consolidation Test | Lab test measuring settlement behavior of cohesive soils under load |
| 地質断面図chishitsu danmenzu | Geological Cross Section | Subsurface profile drawn by connecting boreholes — shows layer geometry |
| 原位置試験gen'ichi shiken | In-Situ Test | Tests conducted in the ground during investigation (SPT, CPT, vane shear, PMT) |
| 朝礼chōrei | Morning Safety Meeting | Daily formal site meeting — attendance mandatory, led by site supervisor |
| 日報nippō | Daily Report | Written daily record of work performed, samples collected, and site conditions |
| 現場監督genba kantoku | Site Supervisor | Engineer in charge of on-site operations — a 地質調査技士 often fills this role |
| 粒度分析ryūdo bunseki | Particle Size Analysis | Lab test classifying soil by grain size — sieve + hydrometer for fine-grained soils |
| 地耐力ji-tairyoku | Bearing Capacity | Maximum load the ground can support — critical output of investigation reports |
| 調査報告書chōsa hōkokusho | Investigation Report | Final report summarizing all investigation data, analysis, and recommendations |
| 液状化ekijōka | Liquefaction | Soil loss of strength during earthquake — assessed using SPT N-values and grain size |
| せん断強度sendan kyōdo | Shear Strength (τ) | τ = c + σ tanφ — 三軸圧縮試験 (さんじくあっしゅく) や一軸圧縮試験 (いちじくあっしゅく) で測定。地盤安定性の基本指標。 |
| 有効応力yūkō ōryoku | Effective Stress (σ') | σ' = σ − u — テルツァーギの原理 (Terzaghi's principle)。全ての地盤計算の基礎となる概念。 |
| 孔内水平載荷試験kōnai suihei saika shiken | Pressuremeter Test (PMT) | Borehole test measuring lateral soil stiffness (変形係数 E) by expanding a cylindrical probe against the borehole wall. |
| 岩盤分類ganban bunrui | Rock Mass Classification | RMR (Rock Mass Rating) / Q-system / 日本の地山等級 — used for tunnel support design and slope cutting. |
| 安全率anzen-ritsu | Factor of Safety (Fs) | Ratio of resisting force to driving force in stability analysis. Fs ≥ 1.5 for slopes (斜面). Fs ≥ 3 for foundations (基礎). |
4 — Core Skills Required
Four skill domains for professional competence
▶
🧪 Engineering Knowledge
Soil mechanics — consolidation, shear strength, permeability
Rock mechanics — RQD, core recovery, rock classification
Engineering geology — stratigraphy, geological mapping, fault zones
Geotechnical seismology — Vs30, liquefaction assessment, site amplification
🔩 Field Investigation Skills
Boring investigation supervision — rig operation and quality control
SPT execution — hammer energy, blow count recording, N-value correction
Soil and rock sampling — disturbed, undisturbed, core sampling techniques
Groundwater observation — standpipes, recovery tests, artesian conditions
📊 Data Analysis Skills
Stratigraphy interpretation — layer correlation between multiple boreholes
Soil classification — JGS and Unified Soil Classification systems
Geological cross sections — drawing subsurface profiles from borehole data
N-value interpretation — bearing capacity, liquefaction potential, SPT correlations
📝 Professional Skills
Report writing — Japanese 調査報告書 format and technical documentation
Safety management — Japanese construction site safety laws and protocols
Investigation planning — borehole layout, test selection, scope management
Site communication — Japanese technical vocabulary and team coordination
5 — Step-by-Step Learning Roadmap
Check off tasks as you complete them — progress updates automatically
▶
L1
Basic Understanding
Geology · Soil Mechanics · Japanese Technical Vocabulary
0/3
Geology Basics
Understand rock types (igneous, sedimentary, metamorphic), geological formations common in Japan, quaternary deposits, and basic stratigraphic principles. Study how Japan's geology relates to earthquakes and ground behavior.
Soil Mechanics
Master consolidation theory, shear strength (Mohr-Coulomb), permeability, and effective stress. Understand how these properties connect to field investigation results and engineering decisions.
Japanese Technical Vocabulary
Learn the 20 essential field vocabulary terms in Section 3 above. Practice using them in context — drilling operations, morning meetings, and daily reports. Communication confidence comes from vocabulary mastery.
L2
Field Investigation
Boring · SPT · Sampling · Groundwater Observation
0/4
Boring Investigation (ボーリング調査)
Learn rotary drilling methods used in Japan, casing installation, drill fluid management, and borehole stabilization. Understand JIS A 1219 standard requirements for boring operations and quality control procedures.
Standard Penetration Test — SPT (標準貫入試験)
Master the full SPT procedure: hammer drop height, blow count recording, split spoon sampler, N-value interpretation. Learn JIS A 1219 specifications and how N-values are used for bearing capacity and liquefaction assessment in Japan.
Soil Sampling (試料採取)
Understand disturbed vs undisturbed sampling methods. Practice thin-wall tube sampling (JIS A 1202), Denison sampler use, and sample labeling. Learn how to assess sample quality and decide sampling intervals based on investigation objectives.
Groundwater Observation (地下水位測定)
Learn standpipe installation, water level measurement with electrical probes, and recovery test procedures. Understand the difference between static water table, artesian pressure, and perched water conditions common in Japan's alluvial plains.
L3
Data Interpretation
Stratigraphy · Soil Classification · Cross Sections
0/3
Stratigraphy Interpretation
Learn to read 地質柱状図 (borehole logs), identify stratigraphic boundaries, correlate layers between multiple boreholes, and recognize geological anomalies. Understand Japan's common alluvial sequences — sands, gravels, clays, and volcanic ash layers.
Soil Classification (地盤分類)
Master the JGS soil classification system used in Japan. Learn to classify soils by particle size, plasticity, consistency, and color using standardized Japanese descriptions. Understand how Japanese classifications map to international Unified Soil Classification (USC) codes.
Geological Cross Sections (地質断面図)
Practice drawing and interpreting geological cross sections from borehole data. Learn how to interpolate between boreholes, show fault zones, represent groundwater levels, and present findings clearly in Japanese investigation report formats.
L4
Investigation Planning
Borehole Layout · Test Selection · Report Structure
0/3
Borehole Layout Design
Learn to determine the number, spacing, and depth of boreholes based on project type — building foundations, road embankments, tunnels, slopes. Study Japanese public works investigation standards (道路土工調査指針, 建築基礎設計指針) for minimum borehole requirements.
Selecting Investigation Methods
Understand when to use SPT vs CPT vs geophysical methods. Learn cost-effectiveness considerations, ground condition suitability, and Japanese procurement rules for public investigation contracts. Practice selecting investigation programs for different ground conditions and project objectives.
Investigation Report Structure (調査報告書)
Study the standard sections of Japanese 地質調査報告書: introduction, investigation purpose, methods, results (borehole logs, cross sections), analysis, and engineering conclusions. Practice formatting N-value tables, attaching lab test results, and writing professional Japanese technical summaries.
L5
Professional Practice
Report Writing · Engineering Judgement · Safety Management
0/3
Report Writing (調査報告書)
Develop professional-level report writing skills using Japanese geotechnical report conventions. Learn how to present data objectively, write technical conclusions that clients and designers can act on, and structure deliverables according to contract requirements and JGS guidelines.
Engineering Judgement
Learn to handle ambiguous site data, unusual ground conditions, and unexpected findings during investigation. Develop decision-making skills for when to extend borehole depth, request additional testing, or halt operations due to unexpected hazards. Practice identifying anomalies from real Japanese case studies.
Safety Management (安全管理)
Study Japanese construction site safety laws (労働安全衛生法). Learn daily safety protocols: 朝礼 procedures, KY (危険予知) risk identification activities, PPE requirements, borehole edge protection, underground utility checks, and emergency response procedures specific to drilling operations.
L6
Exam Preparation
Past Questions · Case Studies · Investigation Design Problems
0/3
Past Exam Questions (過去問)
Review written exam questions from previous 地質調査技士 examinations. Focus on topics including SPT procedures, soil classification, geological logging, groundwater, report writing, and Japanese investigation standards. The Japan Foundation Engineering Association (地盤工学会) publishes past exam materials.
Case Studies (事例研究)
Analyze real Japanese ground investigation scenarios — foundation failures, slope instabilities, liquefaction events. Study how adequate investigation could have identified risks early. Japanese Geotechnical Journal (地盤工学会誌) contains published case studies from actual projects.
Investigation Design Problems
Practice designing complete ground investigation programs from project brief to deliverable plan. Given a project description (building type, site location, ground conditions), produce a borehole layout, test schedule, sampling plan, and report outline. This is the core competency tested in the practical exam portion.
6 — Progress Overview
Your learning status across all 6 levels
▶
EXAM ELIGIBILITY REQUIREMENTS
To apply for the 地質調査技士 exam, candidates must demonstrate field investigation experience. University graduates need 2 years; college graduates need 4 years; high school graduates need 7 years of documented geological investigation work. The examination is held annually, typically in October.
EXAM STRUCTURE
Written Exam: Multiple choice — geology, soil mechanics, investigation methods, standards, and safety.
Practical Exam: Investigation planning problem — design a ground investigation from a project brief.
Passing score: typically 60% or above on each section.
物理探査技士 Roadmap
// Geophysical Exploration Engineer Roadmap for Japan — 物理探査技士資格ロードマップ
← Career Roadmap
🌊 物理探査技士
Geophysical Exploration Engineer
Master Japan's geophysical survey methods — seismic, electrical, EM, GPR, and gravity — for the national licensing exam
Overall Progress
0%
0 / 19 tasks
1 — Purpose of the Profession
Why geophysical engineers matter · responsibilities · license categories
▶
物理探査技士 (Butsuri Tansa Gishi) are licensed geophysical engineers responsible for planning and executing non-invasive subsurface investigations using elastic waves, electricity, electromagnetism, gravity, and magnetism. They provide critical data for civil engineering, foundation design, earthquake hazard assessment, and natural resource evaluation — all without drilling a single borehole.
Subsurface Imaging
Produce 2D/3D images of underground structure without excavation
Produce 2D/3D images of underground structure without excavation
Velocity Profiling
Determine P-wave and S-wave velocity distributions for earthquake response analysis
Determine P-wave and S-wave velocity distributions for earthquake response analysis
Resistivity Mapping
Map groundwater, clay layers, and contamination plumes via electrical methods
Map groundwater, clay layers, and contamination plumes via electrical methods
Utility Detection
Locate buried pipes, cables, and voids using GPR and EM methods
Locate buried pipes, cables, and voids using GPR and EM methods
Civil Engineering Support
Foundation assessment, slope stability, tunnel face evaluation
Earthquake Engineering
Site amplification, liquefaction potential, Vs30 determination
Environmental Surveys
Groundwater monitoring, contamination mapping, landfill assessment
Resource Exploration
Mineral, geothermal, and aggregate deposit identification
License Categories (部門): The exam covers two specialization tracks —
探査技術部門 (Survey Technology — field operations) and
総合技術監理部門 (Integrated Technical Management — senior supervisory role).
Most field engineers first qualify in the Survey Technology category.
2 — Daily Work on Site
What a geophysical engineer actually does day-to-day in the field
▶
朝礼 (Morning)
Site Setup & Safety Briefing
Conduct KY (危険予知) risk identification. Lay out measurement lines (測線), mark receiver/electrode positions, check equipment calibration, confirm utility clearance with client.
午前 (Field Work)
Data Acquisition
Operate seismographs (震源・受振器), resistivity meters, GPR antenna, or gravity meters depending on the survey type. Trigger seismic sources (hammer blow/vibrator), record waveforms, check signal quality in real time.
昼休み (Midday)
Field QC Check
Review raw data on laptop — check shot gathers, verify geophone coupling, identify noise sources. Re-acquire bad records. Document measurements in field log (野帳).
午後 (Afternoon)
Data Processing & Pack-up
Begin first-pass processing on-site: pick first arrivals, apply filters, generate preliminary velocity model. Pack equipment, restore measurement lines, complete field record forms (フィールドシート).
事務所 (Office)
Analysis & Reporting
Process full dataset using specialized software (SeisImager, ReSIS-2D, REFLEXW). Generate velocity cross-sections, resistivity tomography images, interpreted geological profiles. Draft technical report.
3 — Japanese Technical Vocabulary
20 essential geophysical survey terms in Japanese
▶
| 日本語 | 読み方 | English | Field Meaning |
|---|---|---|---|
| 物理探査 | ぶつりたんさ | Geophysical Exploration | Non-invasive subsurface investigation using physical properties |
| 弾性波探査 | だんせいはたんさ | Seismic Survey | Uses elastic wave propagation to image subsurface structure |
| 屈折法 | くっせつほう | Refraction Method | Seismic refraction for determining shallow velocity layers |
| 反射法 | はんしゃほう | Reflection Method | Seismic reflection for imaging deep geological structures |
| 表面波探査 | ひょうめんはたんさ | Surface Wave Survey | MASW method — derives S-wave velocity (Vs) profile from surface waves |
| 電気探査 | でんきたんさ | Electrical Survey | Measures subsurface resistivity using injected electrical current |
| 比抵抗 | ひていこう | Resistivity (Ω·m) | Electrical property indicating rock/soil type and saturation |
| 電磁探査 | でんじたんさ | Electromagnetic Survey | EM induction methods for conductive layer mapping |
| 地中レーダー | ちちゅうレーダー | GPR (Ground Penetrating Radar) | High-frequency radar for shallow utility and void detection |
| 重力探査 | じゅうりょくたんさ | Gravity Survey | Measures density contrast anomalies in the subsurface |
| 走時曲線 | そうじきょくせん | Travel-Time Curve | Plot of seismic wave arrival time vs. source-receiver distance |
| 受振器 | じゅしんき | Geophone | Ground motion sensor planted along measurement line |
| PS検層 | ピーエスけんそう | PS Logging | Borehole measurement of P-wave and S-wave velocities |
| 常時微動 | じょうじびどう | Microtremor | Ambient ground vibration used for site amplification analysis |
| 速度構造 | そくどこうぞう | Velocity Structure | Layered model of seismic wave velocities in the ground |
| 比抵抗断面図 | ひていこうだんめんず | Resistivity Section | 2D tomographic image of subsurface electrical resistivity |
| ノイズ除去 | ノイズじょきょ | Noise Removal | Signal processing step to improve data quality (filtering) |
| 地下水位 | ちかすいい | Groundwater Level | Depth to phreatic surface — affects resistivity and seismic response |
| 異常値 | いじょうち | Anomaly Value | Deviation from background that indicates subsurface feature |
| 解析断面図 | かいせきだんめんず | Interpreted Section | Final geological cross-section drawn from processed geophysical data |
| Vs30 | ブイエスさんじゅう | Average S-wave Velocity (0–30 m) | 30m深さまでの平均S波速度 (へいきんエスはそくど)。地盤種別判定 (じばんしゅべつはんてい) の基準。道路橋示方書で必須。 |
| 地盤増幅率 | じばんぞうふくりつ | Site Amplification Factor | 地震動が地盤を伝わる際に増幅される倍率 (ばいりつ)。H/V スペクトル比 (Nakamura法) で評価。 |
| 固有周期 | こゆうしゅうき | Natural Period (T) | 地盤が最も揺れやすい振動周期 (しんどうしゅうき)。T = 4H/Vs で近似。建物との共振 (きょうしん / resonance) を避ける設計に必須。 |
| 測線 | そくせん | Measurement Line / Survey Profile | 探査機器を並べるライン。測線長 (そくせんちょう) と受振器間隔 (じゅしんきかんかく) が探査深度と分解能を決める。 |
| 開口亀裂 | かいこうきれつ | Open Fracture / Void | 地中レーダー (GPR) の反射波パターンで検出される地下の空洞 (くうどう) や亀裂 (きれつ)。双曲線 (そうきょくせん / hyperbola) 形状が指標。 |
4 — Core Skills Required
Technical competencies for qualified geophysical exploration engineers
▶
Seismic Methods
Refraction & reflection survey operation
MASW surface wave analysis (Vs profiling)
PS logging interpretation
Travel-time curve picking & inversion
Electrical & EM Methods
Resistivity tomography (2D inversion)
Wenner / Schlumberger electrode arrays
GPR antenna selection & data interpretation
EM induction for conductive layer mapping
Data Processing
SeisImager, ReSIS-2D, REFLEXW software
Noise removal & filtering techniques
Velocity model building & inversion
Cross-section construction & geological interpretation
Professional Skills
Survey design for project objectives
Japanese technical report writing
Equipment maintenance & calibration
Site safety management (安全管理)
5 — 6-Level Learning Roadmap
Step-by-step path from geophysics fundamentals to exam readiness
▶
L1
Foundation Knowledge
Geophysics Basics · Wave Theory · Exploration Methods Overview
0/3
Geophysics Fundamentals (物理探査の基礎)
Study the four main branches of geophysical exploration: seismic (弾性波), electrical (電気), electromagnetic (電磁), and gravity/magnetic (重力・磁気). Understand the physical properties being measured — density, velocity, resistivity, susceptibility — and how they relate to soil and rock types in Japan. Learn the JGS (地盤工学会) geophysical survey standards.
Wave Theory (弾性波理論)
Understand P-waves (縦波/圧縮波) and S-waves (横波/せん断波): propagation, velocity (Vp, Vs), Snell's law of refraction, reflection coefficients, and wave mode conversion. Study how velocity contrasts between geological layers produce refracted and reflected arrivals. Derive Vs30 (30m平均S波速度) used in Japanese seismic design codes.
Survey Method Overview (探査手法概論)
Survey all major geophysical methods used in Japanese practice: seismic refraction (屈折法), MASW surface waves (表面波), electrical resistivity tomography (電気探査), GPR (地中レーダー), PS logging (PS検層), microtremor (常時微動), and gravity surveys (重力探査). For each, understand the target depth, resolution, required site conditions, and typical cost/time.
L2
Field Investigation Methods
Seismic · Electrical · PS Logging · Surface Waves
0/4
Seismic Refraction Survey (屈折法弾性波探査)
Learn the full workflow: lay out measurement line (測線), plant geophones (受振器) at regular intervals, trigger seismic source (hammer or drop weight), record seismograms. Understand cross-over distance, critical distance, and how to identify first arrivals from different layers. Practice on Japanese project case data with 24-channel setups.
Electrical Resistivity Survey (電気探査)
Master the Wenner and Schlumberger electrode array configurations used in Japan. Understand how to inject current through C electrodes and measure potential at P electrodes to compute apparent resistivity. Practice 2D ERT (Electrical Resistivity Tomography) data collection along profiles. Learn how groundwater, clay content, and contamination affect resistivity values in Japanese geological settings.
PS Logging (PS検層)
Study borehole geophysical logging: up-hole (上方向), down-hole (下方向), and suspension PS logging (サスペンション検層). Learn to trigger seismic sources at surface and record waveforms in borehole at multiple depths to measure interval P-wave and S-wave velocities. Understand how PS data integrates with SPT N-values and soil classification in Japanese foundation engineering.
Surface Wave Survey — MASW (表面波探査)
Learn the MASW (Multichannel Analysis of Surface Waves) method widely used in Japan for Vs profiling without boreholes. Understand Rayleigh wave dispersion — how different frequencies sample different depths. Study the full MASW workflow: shot gather acquisition, frequency-velocity spectrum (f-v panel), dispersion curve picking, and Vs inversion. Compare results with PS logging data.
L3
Data Analysis & Interpretation
Travel-Time Analysis · Resistivity Inversion · Anomaly Identification
0/3
Seismic Data Analysis (弾性波データ解析)
Learn first-arrival picking on seismograms, travel-time curve (走時曲線) construction, and intercept-time method for layer velocity/thickness calculation. Practice plus-minus method (±法) and generalized reciprocal method (GRM) for refractor mapping. Use SeisImager software to compute velocity models. Understand typical Vp and Vs ranges for Japanese alluvial, diluvial, and rock formations.
Resistivity Data Interpretation (電気探査データ解析)
Study apparent resistivity pseudosection construction, smoothness-constrained least-squares inversion (ReSIS-2D), and interpretation of the resulting true resistivity cross-section. Learn to identify geological features: low-resistivity zones (clayey/wet layers, contamination), high-resistivity zones (rock, dry gravel), and groundwater table position. Compare 2D resistivity sections with borehole log data.
Microtremor & GPR Analysis (常時微動・地中レーダー解析)
Learn H/V spectral ratio (Nakamura method) for site fundamental period (固有周期) and amplification factor estimation from microtremor records. Study GPR two-way travel time (双方向走時) to depth conversion using antenna frequency selection (250 MHz for utilities, 50 MHz for deeper targets). Practice interpreting GPR profiles for buried pipes, rebars, cavities, and layer boundaries.
L4
Survey Planning
Method Selection · Layout Design · Equipment & Safety
0/3
Method Selection (探査手法選定)
Develop the ability to recommend the most appropriate geophysical method(s) given project objectives, target depth, site constraints (urban noise, narrow access, buried utilities), budget, and required resolution. Practice matching survey types: MASW for Vs30 without boreholes, ERT for groundwater mapping, GPR for utility survey, PS logging for building design. Learn how to combine multiple methods for maximum information.
Survey Layout Design (測線計画)
Design optimal measurement line (測線) placement, receiver spacing, array length, and shot point locations for target depth and resolution requirements. Understand how geophone spacing controls the maximum depth of investigation in refraction surveys. Plan electrode spacing for ERT to achieve required penetration depth. Learn how to account for topographic corrections (地形補正) in hilly terrain surveys.
Equipment & Site Safety (機器管理・安全管理)
Study geophysical instrument specifications: seismograph channels and dynamic range, resistivity meter current injection limits, GPR antenna frequencies. Learn pre-survey equipment checks (機器点検) and field calibration procedures. Study Japanese road traffic management (交通規制) required for roadside surveys, buried utility locating procedures (埋設物確認), and electrical safety requirements for ground electrode surveys near power infrastructure.
L5
Professional Practice
Report Writing · Geological Interpretation · Quality Control
0/3
Report Writing (物理探査報告書)
Develop professional-level report writing skills for Japanese geophysical survey reports. Structure: survey purpose, site conditions, method description, data acquisition parameters, processing procedures, results (velocity cross-sections, resistivity sections), geological interpretation, engineering conclusions, and limitations. Learn to present uncertainty and data quality assessment clearly. Practice writing Japanese technical prose that engineers and non-specialists can both understand.
Geological Interpretation (地質解釈)
Develop skills to translate geophysical data (velocity sections, resistivity sections) into engineering geological cross-sections. Learn to correlate geophysical boundaries with geological boundaries — alluvial vs. diluvial deposits, weathered vs. fresh rock. Integrate borehole data with geophysical profiles. Understand how to handle conflicting evidence between methods and how to quantify depth-to-bedrock uncertainty.
Quality Control & Standards (品質管理)
Study Japanese geophysical survey quality standards: JGS 1511 (seismic refraction), JGS 1521 (resistivity), and relevant JSCE/AIJ guidelines. Learn field QC procedures: signal-to-noise ratio checks, repeatability tests (reciprocal shots), electrode contact resistance verification. Understand what constitutes rejectable data and when re-acquisition is required. Study common sources of error: cultural noise, ground coupling problems, electrode polarization.
L6
Exam Preparation
Past Questions · Case Studies · Integrated Survey Design
0/3
Past Exam Questions (過去問演習)
Review written exam questions from previous 物理探査技士 examinations published by the Society of Exploration Geophysicists of Japan (社団法人物理探査学会). Focus on calculation problems: travel-time interpretation, Snell's law, depth estimation from intercept times, apparent resistivity calculation from electrode geometry, and Vs30 computation. Develop speed and accuracy under exam time conditions.
Case Studies (事例研究)
Analyze real Japanese geophysical survey projects — earthquake damage investigations, tunnel face assessments, contamination surveys, river embankment evaluations. Study how the choice of geophysical method was justified, what the data showed, and how results were used in subsequent engineering decisions. The Butsuri Tansa journal (物理探査) publishes peer-reviewed Japanese case studies from active practitioners.
Integrated Survey Design (総合探査設計)
Practice designing complete multi-method geophysical investigation programs from a project brief. Given objectives (e.g., bedrock depth for bridge foundation, groundwater mapping for dewatering design), propose method combination, measurement line layout, acquisition parameters, processing workflow, and deliverable format. This integrative competency is central to the senior examination — demonstrating the ability to synthesize all learned methods into a coherent, cost-effective investigation plan.
6 — Progress Overview
Your learning status across all 6 levels
▶
📋 Exam Information
Administering body: 社団法人物理探査学会 (Society of Exploration Geophysicists of Japan)
Exam format: Written examination + practical skill assessment
Specializations: 探査技術部門 (field operations) · 総合技術監理部門 (management)
Requirements: Practical field experience in geophysical surveys
Exam format: Written examination + practical skill assessment
Specializations: 探査技術部門 (field operations) · 総合技術監理部門 (management)
Requirements: Practical field experience in geophysical surveys
技術士補 Roadmap
// Associate Professional Engineer — Japan PE First Examination 技術士一次試験
← Career Roadmap
🎓 技術士補
Associate Professional Engineer
Pass Japan's 技術士一次試験 (PE First Exam) — covering engineering fundamentals, professional ethics, and geotechnical/geophysical specialisation — to earn the gateway qualification toward full 技術士 registration
Overall Progress
0%
0 / 19 tasks
1 — Purpose of the Qualification
Why 技術士補 matters · exam structure · path to full 技術士
▶
技術士補 (Gijutsu-shi Ho) is the gateway qualification in Japan's two-stage professional engineering registration system, administered by the 公益社団法人日本技術士会 (IPEJ — Institution of Professional Engineers, Japan). Passing the 技術士一次試験 (First Examination) demonstrates mastery of engineering fundamentals and professional ethics — and officially begins your supervised experience period toward the full 技術士 licence.
National Recognition
Legally recognised qualification under the 技術士法 (Professional Engineer Act) of Japan
Legally recognised qualification under the 技術士法 (Professional Engineer Act) of Japan
Experience Clock Starts
4-year supervised experience period under a 技術士 begins after registration
4-year supervised experience period under a 技術士 begins after registration
International Equivalency
Aligns with Washington Accord / JABEE accreditation for global mobility
Aligns with Washington Accord / JABEE accreditation for global mobility
Career Gateway
Required precursor for senior design roles, CPD recognition, and public works contracts
Required precursor for senior design roles, CPD recognition, and public works contracts
基礎科目 Fundamentals
Mathematics, physics, chemistry, information science — 30 questions, choose 15
適性科目 Ethics
Professional ethics, legal obligations, CPD — 15 questions, answer all
専門科目 Technical
35 questions in chosen branch (建設, 応用理学, 環境, etc.) — choose 25
JABEE Exemption
Graduates of JABEE-accredited programmes are exempt from the First Examination
Exam Date & Pass Rate: Held every November · approximately 40–50% overall pass rate ·
After passing, register with IPEJ and begin supervised experience under a designated 技術士 supervisor (指導技術士) · minimum 4 years required before sitting 二次試験
2 — Role After Qualification
What a 技術士補 does on site and in the office during supervised experience
▶
現場補助 (Field Support)
Supervised Investigation Work
Assist licensed 技術士 on geotechnical or geophysical projects. Record data, assist with borehole logging (ボーリング柱状図), help with SPT, sampling, and geophysical equipment operation. Document all observations in field logs (野帳) per JIS/JGS standards.
技術文書 (Technical Docs)
Report Drafting Under Supervision
Draft sections of geotechnical investigation reports, soil classification tables, and boring log sheets. Apply N値 correlation charts, grain size analysis, Atterberg limits, and basic bearing capacity calculations. Supervisor reviews and countersigns all submitted documents.
研修・CPD (Training)
Continuing Professional Development
Attend IPEJ-recognised CPD seminars and workshops. Accumulate CPD points (CPD単位) in technical and ethics subjects. Study for 技術士二次試験 筆記試験 (written exam) topics: engineering problem-solving essays, technical competency demonstrations, and professional ethics scenarios.
設計補助 (Design Support)
Foundation Design Assistance
Calculate bearing capacity (支持力), settlement (沈下量), and liquefaction potential (液状化判定) under supervision. Use software tools (DIPS, GeoStudio, PLAXIS) for stability analysis. Review drawing sets for foundation types: shallow foundations (直接基礎), piles (杭基礎), and improved ground (地盤改良).
業務経歴 (Experience Record)
Experience Portfolio Building
Maintain a detailed 業務経歴書 (professional experience record) documenting all supervised work. Each project entry must include: project purpose, your technical role, methods used, results, and supervisor's evaluation. This portfolio forms the basis of the 二次試験 application and oral examination (口頭試験).
3 — Japanese Technical Vocabulary
25 essential terms spanning exam subjects, ethics, and geotechnical engineering
▶
| 日本語 | 読み方 | English | Technical Meaning |
|---|---|---|---|
| 技術士補 | ぎじゅつしほ | Associate Professional Engineer | Holder of 一次試験 pass; registered under IPEJ to commence supervised experience |
| 技術士一次試験 | ぎじゅつしいちじしけん | PE First Examination | National exam covering 基礎科目, 適性科目, and 専門科目 |
| 基礎科目 | きそかもく | Fundamentals Subject | Group I: Design/information, Group II: Environment, Group III: Materials/mechanics, Group IV: Environment/energy, Group V: Math/statistics |
| 適性科目 | てきせいかもく | Ethics/Aptitude Subject | Professional ethics, public safety obligations, conflict of interest, CPD requirements under 技術士法 |
| 専門科目 | せんもんかもく | Technical Subject | Branch-specific engineering questions — 建設部門 for geotechnical engineers |
| 建設部門 | けんせつぶもん | Construction Branch | Main 技術士 branch for civil, foundation, and geotechnical engineers in Japan |
| 応用理学部門 | おうようりがくぶもん | Applied Science Branch | Covers geology, geophysics, geochemistry — relevant for exploration engineers |
| 公益確保の責務 | こうえきかくほのせきむ | Public Interest Duty | Obligation under 技術士法 Article 45-2 to protect public safety above client interests |
| 守秘義務 | しゅひぎむ | Confidentiality Obligation | Legal duty under 技術士法 Article 45 not to disclose client technical information |
| 継続研鑚 | けいぞくけんさん | Continuing Professional Development (CPD) | Ongoing technical and ethical self-improvement required to maintain registration |
| 指導技術士 | しどうぎじゅつし | Supervising Professional Engineer | Licensed 技術士 who oversees and signs off on 技術士補 experience records |
| 業務経歴書 | ぎょうむけいれきしょ | Professional Experience Record | Portfolio of supervised engineering work submitted with 二次試験 application |
| 支持力 | しじりょく | Bearing Capacity | Maximum load per unit area a foundation soil can safely sustain (kN/m²) |
| 沈下量 | ちんかりょう | Settlement | Vertical compression of soil under load — immediate, consolidation, and secondary types |
| 液状化判定 | えきじょうかはんてい | Liquefaction Assessment | Japanese method (道路橋示方書) evaluating FL value from SPT N-values and grain size |
| N値 | エヌち | SPT N-value | Blow count per 300mm in Standard Penetration Test — key parameter for soil classification and design |
| 圧密沈下 | あつみつちんか | Consolidation Settlement | Time-dependent settlement from gradual expulsion of pore water from cohesive soils |
| せん断強度 | せんだんきょうど | Shear Strength | Maximum shear stress a soil can resist before failure (c + σ tanφ — Mohr-Coulomb) |
| 有効応力 | ゆうこうおうりょく | Effective Stress | Total stress minus pore water pressure (σ' = σ − u) — governs soil strength and deformation |
| 透水係数 | とうすいけいすう | Hydraulic Conductivity (k) | Rate of water flow through soil per unit hydraulic gradient (m/s) — Darcy's Law |
| 粒度分布 | りゅうどぶんぷ | Particle Size Distribution | Grading curve from sieve + hydrometer analysis — defines soil classification (JIS A 1204) |
| コンシステンシー限界 | コンシステンシーげんかい | Atterberg Limits | LL (液性限界) and PL (塑性限界) define water content boundaries between soil behaviour states |
| 地盤改良 | じばんかいりょう | Ground Improvement | Techniques to enhance soil properties: cement mixing (セメント改良), vibro-compaction, preloading |
| 安全率 | あんぜんりつ | Factor of Safety (FS) | Ratio of resisting force to driving force in stability analysis — typically FS ≥ 1.5 for slopes |
| フローネット | フローネット | Flow Net | Graphical method of seepage analysis — orthogonal equipotential lines and flow lines in soil |
4 — Core Skills for the Exam
Technical competencies across all three 一次試験 examination subjects
▶
基礎科目 — Fundamentals
Linear algebra, differential equations, statistics
Statics, dynamics, material mechanics
Thermodynamics, fluid mechanics basics
Information science, algorithm complexity
適性科目 — Ethics
技術士法 Articles 44–47 obligations
Public interest vs. client interest scenarios
Whistleblowing, conflict of interest rules
Environmental impact and sustainability ethics
専門科目 — Geotechnical
Soil classification, phase relations, compaction
Effective stress, seepage, consolidation theory
Shear strength — Mohr-Coulomb, triaxial test
Bearing capacity, slope stability, retaining walls
Calculation Skills
Terzaghi bearing capacity formula application
Consolidation settlement calculation (Cc, Cs, e0)
Liquefaction FL value from N-value and grain size
Slope stability: Bishop simplified method, FS
5 — 6-Level Learning Roadmap
From engineering basics to full 一次試験 readiness
▶
L1
Engineering Fundamentals
Mathematics · Mechanics · 基礎科目 Groups I–V
0/3
Mathematics & Statistics (数学・統計学)
Review all 基礎科目 Group V mathematics topics tested in 一次試験: linear algebra (matrix operations, eigenvalues), differential/integral calculus, ordinary differential equations, Fourier series, probability distributions (normal, binomial, Poisson), hypothesis testing, regression analysis, and descriptive statistics. Focus on recognising question types and applying formulas accurately within the 2.5-hour exam window. Practise with 10 years of past exam questions from IPEJ.
Mechanics & Materials (材料力学・固体力学)
Master 基礎科目 Group III: stress-strain relations (Hooke's Law), principal stresses, Mohr's circle of stress, beam bending (M/I = σ/y), deflection equations, buckling (Euler's formula), fatigue and creep. Understand material properties: Young's modulus (E), Poisson's ratio (ν), and shear modulus (G). These are foundational for the geotechnical 専門科目 — soil mechanics draws directly from continuum mechanics principles.
Fluid Mechanics & Thermodynamics (流体力学・熱力学)
Study 基礎科目 Group IV (environment/energy) fluids and thermodynamics: Bernoulli's equation, continuity equation, Reynolds number, laminar vs. turbulent flow, pipe flow (Darcy-Weisbach), open-channel hydraulics, and Darcy's Law for porous media (直接関連 to geotechnical seepage). Thermodynamics: first and second laws, heat engines, entropy. These topics appear every year in 基礎科目 and connect directly to groundwater and soil-water interaction in 専門科目.
L2
Soil Mechanics Core Theory
Phase Relations · Effective Stress · Consolidation · Shear Strength
0/4
Soil Classification & Phase Relations (土の分類・相関係)
Master the three-phase soil model (solid, water, air). Calculate void ratio (e), porosity (n), degree of saturation (Sr), water content (w), unit weight (γ), and relative density (Dr). Learn JIS A 1202–1210 test procedures: grain size analysis (粒度試験), Atterberg limits (コンシステンシー試験), specific gravity (土粒子の密度試験), and compaction (締固め試験). Classify soils using the unified system (統一分類法) — GW, GP, GM, GC, SW, SP, SM, SC, ML, CL, MH, CH. These form the basis of every borehole log and geotechnical report in Japan.
Effective Stress & Seepage (有効応力・浸透流)
Understand Terzaghi's effective stress principle (σ' = σ − u) and its central role in all geotechnical calculations. Calculate total stress profiles, pore water pressure (hydrostatic and excess), and effective stress with capillary rise and artesian conditions. Study Darcy's Law (q = kiA), coefficient of permeability (k) values for different soil types, seepage force, piping failure (ヒービング、ボイリング), and flow net construction. Learn consolidation theory: Terzaghi 1D consolidation (cv, Tv, Uv) and degree of consolidation calculation.
Consolidation Settlement (圧密沈下)
Calculate primary consolidation settlement (Sc) using compression index Cc (正規圧密) and swelling index Cs (過圧密). Determine preconsolidation pressure (pc') from e-log p curves and Casagrande construction. Calculate settlement time using time factor Tv and drainage path (Hdr). Study secondary consolidation (二次圧密/クリープ), defined by Cα. Practise complete settlement problems: total settlement, time to 90% consolidation (U=90%), and settlement under embankment loading — all common 専門科目 exam questions.
Shear Strength & Failure (せん断強度・破壊理論)
Master Mohr-Coulomb failure criterion (τ = c' + σ' tanφ'): total and effective stress parameters, cohesion intercept (c, c'), and friction angle (φ, φ'). Understand drained (排水) vs. undrained (非排水) conditions and when to apply each. Study laboratory strength tests: triaxial compression (三軸圧縮試験 — UU, CU, CD), unconfined compression (一軸圧縮試験), and direct shear (直接せん断試験). Learn sensitivity ratio (鋭敏比) for Japanese marine clays and thixotropic regain. Apply to bearing capacity, slope stability, and earth pressure problems.
L3
Foundation Engineering
Bearing Capacity · Retaining Walls · Slope Stability · Piles
0/3
Bearing Capacity & Shallow Foundations (支持力・直接基礎)
Apply Terzaghi's bearing capacity equation (qu = cNc + qNq + 0.5γBNγ) for strip, circular, and rectangular footings. Use Meyerhof, Hansen, and Vesic shape/depth/inclination factors. Calculate net allowable bearing capacity (許容支持力) with factor of safety FS = 3. Determine foundation depth requirements from frost depth (凍結深さ) and scour considerations for Japanese climate zones. Calculate immediate settlement (即時沈下) using elastic theory. Study the Japanese design standard 建築基礎構造設計指針 bearing capacity approach.
Earth Pressure & Retaining Structures (土圧・擁壁)
Master Rankine (ランキン) active (Ka) and passive (Kp) earth pressure coefficients for cohesionless and cohesive soils. Apply Coulomb (クーロン) earth pressure with wall friction (δ). Calculate total thrust, point of application, and overturning/sliding stability for gravity retaining walls (重力式擁壁). Study Japanese standard retaining wall design: JRA (道路橋示方書) and NEXCO guidelines. Understand sheet pile walls (矢板), anchored walls, and soil nailing (地山補強土工法) stability mechanisms.
Slope Stability & Liquefaction (斜面安定・液状化)
Calculate factor of safety for infinite slopes (無限斜面) in dry and saturated conditions. Apply Bishop simplified method (ビショップ法) for circular slip surfaces — the standard Japanese design method for embankments and cut slopes. Study liquefaction assessment by the Japanese road bridge standard method: calculate FL = RL/L from N-value, grain size (D50, Fc), and overburden stress. Determine liquefaction potential index (PL値). Understand countermeasures: densification (締固め), drainage, cementation (固化処理).
L4
Professional Ethics
技術士法 · Public Safety · Conflict of Interest · CPD
0/3
技術士法 Legal Framework
Study the full text and implications of 技術士法 (Act on Professional Engineers, 1957 as amended). Key articles: Article 2 (definition of 技術士), Article 44 (名称使用制限 — title restriction), Article 45 (守秘義務 — confidentiality), Article 45-2 (公益確保 — public interest obligation), Article 46 (名称表示 — title display rules), Article 47-2 (継続研鑚 — CPD obligation). Understand disciplinary procedures: reprimand (戒告), licence suspension (業務停止命令), and registration cancellation (登録の取消し) for violations.
Ethics Scenarios & Decision-Making
Practise 適性科目 style scenario questions: recognising conflicts of interest (利益相反), deciding when public safety (公衆安全) overrides client confidentiality, responding to pressure to falsify investigation data, handling incomplete site information in reports, and whistleblowing obligations under Japanese law. Study the IPEJ Code of Ethics (技術士倫理綱領) and JABEE ethics guidelines. Review real case studies of engineering failures in Japan where ethics violations contributed: Hanshin Expressway, JR Hokkaido inspection scandals.
Sustainability & Risk Management (持続可能性・リスク管理)
Study 適性科目 Group 3 topics: sustainable development goals (SDGs) in engineering practice, life cycle assessment (LCA), environmental impact assessment (環境影響評価法), risk identification and mitigation in geotechnical projects. Understand the engineering management concepts tested: PDCA cycle, project risk matrix, quality management systems (ISO 9001), and environmental management (ISO 14001). Learn how Japanese infrastructure regulations address climate adaptation — key topic in recent 適性科目 exam papers.
L5
Integrated Problem Solving
Calculation Practice · Mock Exams · Time Management
0/3
Geotechnical Calculation Drills (計算演習)
Build speed and accuracy on the calculation-heavy 専門科目 question types. Drill sets of: (1) settlement calculation from e-log p data, (2) bearing capacity with eccentric/inclined loading, (3) earth pressure on retaining walls with surcharge, (4) slope stability FS using Bishop method, (5) liquefaction FL calculation from borehole data, (6) seepage velocity from flow net, (7) consolidation time factor. Aim to complete each problem type in under 5 minutes. Use IPEJ published解答例 (model answers) as benchmarks.
Full Mock Exams (模擬試験)
Complete at least 3 full timed mock exams simulating the actual 一次試験 format: 基礎科目 60 min (30 questions, choose 15), 適性科目 40 min (15 questions), 専門科目 120 min (35 questions, choose 25). Use IPEJ's official past exam papers (公表問題) from the last 10 years — all available on the IPEJ website. Score each subject separately: passing threshold is 50% per subject (基礎 ≥7.5/15, 適性 ≥7.5/15, 専門 ≥12.5/25). Review every wrong answer and trace it back to a knowledge gap.
Weak Area Intensive Review (弱点補強)
Analyse mock exam results to identify consistently weak topics. Build a personal study plan targeting the lowest-scoring areas — typically: fluid mechanics in 基礎科目, sustainability ethics scenarios in 適性科目, or consolidation theory in 専門科目. Create summary note cards (要点カード) for every formula and concept in weak areas. Study with a study partner or 技術士補 study group (勉強会) — IPEJ and JGS regional branches organise exam preparation seminars annually across Japan.
L6
Exam Readiness & Registration
Past Papers · Application Process · Post-Qualification Planning
0/3
Past Exam Paper Mastery (過去問完全攻略)
Work through all publicly available 一次試験 papers (IPEJ publishes 10+ years on their website). For 専門科目 (建設部門 or 応用理学部門), categorise questions by topic: soil mechanics, foundation design, earth pressure, seepage, ground improvement, geophysics, and construction materials. Identify recurring question patterns — certain problems (liquefaction FL, consolidation settlement, Terzaghi bearing capacity) appear in almost every year. Build a topic frequency table and focus revision time proportionally.
Application & Registration Process (受験申込・登録)
Study the exam application process: submit 受験申込書 to IPEJ (公益社団法人日本技術士会) by the April deadline. Required documents: application form, transcripts (成績証明書) or work experience certificate, exam fee (受験手数料 ¥11,000). After passing (results announced in January): submit 技術士補登録申請書, registration fee (登録手数料 ¥3,000), and select your designated supervising engineer (指導技術士). Understand JABEE alternative pathway: graduates of accredited programmes skip the exam entirely and register directly.
Path to 技術士 — Planning Next Steps
After becoming 技術士補, plan the 4-year pathway to full 技術士 registration. Requirements for 二次試験 application: minimum 4 years supervised experience under a 技術士 (一般部門), or 7 years total experience (総合技術監理部門). Begin structuring your 業務経歴書 from day one: document every project with technical detail, your role, and outcomes. Attend IPEJ study groups and 二次試験 preparation seminars. The 二次試験 筆記試験 tests 必須科目 (engineering management essay) and 選択科目 (technical subject — 2 essay questions). The 口頭試験 (oral exam) follows for successful written candidates.
6 — Progress Overview
Your learning status across all 6 levels
▶
📋 Exam Information
Administering body: 公益社団法人日本技術士会 (IPEJ — Institution of Professional Engineers, Japan)
Exam held: November each year (results announced January)
Three subjects: 基礎科目 (60 min) · 適性科目 (40 min) · 専門科目 (120 min)
Pass threshold: 50% in each subject independently · overall pass rate ~40–50%
Exam held: November each year (results announced January)
Three subjects: 基礎科目 (60 min) · 適性科目 (40 min) · 専門科目 (120 min)
Pass threshold: 50% in each subject independently · overall pass rate ~40–50%
技術士 Roadmap
// Professional Engineer — 技術士二次試験 · Japan's highest engineering licence
← Career Roadmap
🏆 技術士
Professional Engineer — 技術士
Pass the 技術士二次試験 (Second PE Examination) — 必須科目 essay · 選択科目 technical essays · 口頭試験 oral exam — to earn Japan's highest-level engineering qualification and the right to independent practice
Overall Progress / 全体進捗
0%
0 / 19 tasks
1 — 技術士の役割と資格制度 Purpose & Licence System
二次試験の構造 · 業務権限 · 総合技術監理部門 · 指導義務
▶
技術士 (ぎじゅつし) は、技術士法 (ぎじゅつしほう) に基づく日本最高水準の技術者資格です。公益社団法人日本技術士会 (IPEJ) が管理し、21の技術部門 (ぎじゅつぶもん) にわたります。資格保有者は独立した技術判断 (どくりつしたぎじゅつはんだん) を行う権限を持ち、公共工事 (こうきょうこうじ) の技術管理者として法的に認められます。
必須科目 (ひっすかもく)
Engineering management & ethics essay — 択一問題 (30 min) + 記述問題 (90 min, 600字×2)
Engineering management & ethics essay — 択一問題 (30 min) + 記述問題 (90 min, 600字×2)
選択科目 (せんたくかもく)
Technical branch essays — Ⅱ-1 short answer (2問×600字) · Ⅱ-2 problem-solving (1問×1800字) · Ⅲ application (1問×2100字)
Technical branch essays — Ⅱ-1 short answer (2問×600字) · Ⅱ-2 problem-solving (1問×1800字) · Ⅲ application (1問×2100字)
口頭試験 (こうとうしけん)
20-minute oral interview on 業務経歴書 (professional record) and 技術的体験論文 (technical experience essay)
20-minute oral interview on 業務経歴書 (professional record) and 技術的体験論文 (technical experience essay)
総合技術監理部門 (そうごうぎじゅつかんりぶもん)
Senior category: 5-domain integrated management — requires existing 技術士 registration first
Senior category: 5-domain integrated management — requires existing 技術士 registration first
公益確保 (こうえきかくほ)
Public interest obligation — legal duty to prioritise societal safety above client instructions under 技術士法 Article 45-2
守秘義務 (しゅひぎむ)
Confidentiality duty — 技術士法 Article 45; applies for life, even after retirement from professional practice
継続研鑚 (けいぞくけんさん)
Mandatory CPD — 技術士法 Article 47-2; must accumulate CPD単位 (CPD points) every year to maintain professional competence
後進指導 (こうしんしどう)
Mentoring obligation — as 指導技術士 (しどうぎじゅつし), supervise 技術士補 for their 4-year experience period toward 二次試験
試験日程 (しけんにってい) / Exam Schedule:
筆記試験 (ひっきしけん) — July each year · 口頭試験 (こうとうしけん) — January following year ·
合格率 (ごうかくりつ) pass rate ≈ 10–15% overall ·
Passing the written exam is ~20%; oral exam pass rate ~90% for those called
2 — 技術士の業務 Daily Professional Work
独立業務 · 総括技術者 · 専門技術審査 · 国際業務
▶
業務計画 (ぎょうむけいかく) Planning
調査計画立案 (ちょうさけいかくりつあん) — Survey Programme Design
独立した技術判断 (どくりつしたぎじゅつはんだん / independent technical judgement) で調査仕様書 (ちょうさしようしょ / investigation specification) を作成。地盤条件 (じばんじょうけん)、リスク項目 (リスクこうもく)、工期 (こうき / construction period)、予算 (よさん / budget) を総合評価して最適な調査手法 (さいてきなちょうさしゅほう) を選定する。
技術審査 (ぎじゅつしんさ) Review
総括技術者 (そうかつぎじゅつしゃ) — Lead Technical Reviewer
公共工事 (こうきょうこうじ) の設計書 (せっけいしょ / design documents) と地盤調査報告書 (じばんちょうさほうこくしょ / ground investigation report) を技術的に審査 (ぎじゅつてきにしんさ)。設計計算書 (せっけいけいさんしょ / design calculation sheets) の照査 (しょうさ / checking) と技術的所見 (ぎじゅつてきしょけん / technical opinion) の記名押印 (きめいおういん / signed certification) を行う。
論文・報告書 (ろんぶん・ほうこくしょ) Writing
技術報告書作成 (ぎじゅつほうこくしょさくせい) — Technical Report Authorship
地盤解析結果 (じばんかいせきけっか / ground analysis results) と設計提案 (せっけいていあん / design proposal) をまとめた最終報告書 (さいしゅうほうこくしょ) を執筆 (しっぴつ)。技術士として記名 (きめい / signed with name) し、内容に対して技術的責任 (ぎじゅつてきせきにん / technical responsibility) を負う。
鑑定・証言 (かんてい・しょうげん) Expert
専門家証人 (せんもんかしょうにん) — Expert Witness
地盤沈下訴訟 (じばんちんか そしょう / ground settlement litigation)、斜面崩壊事故調査 (しゃめんほうかいじこちょうさ / slope failure accident investigation)、建設紛争 (けんせつふんそう / construction disputes) における専門的鑑定意見書 (せんもんてきかんていいけんしょ / expert opinion report) の作成と裁判所 (さいばんしょ / court) での証言。
国際業務 (こくさいぎょうむ) International
海外プロジェクト技術支援 (かいがいプロジェクトぎじゅつしえん)
ワシントン協定 (Washington Accord) による資格相互承認 (しかくそうごしょうにん / mutual recognition) を活用した海外技術支援。ODA (政府開発援助 / Official Development Assistance) 案件でのJICA技術協力プロジェクト参加。英語技術報告書 (えいごぎじゅつほうこくしょ) 作成と現地エンジニア育成。
3 — 専門用語集 Technical Vocabulary / 日本語・英語対照
25 terms — 二次試験の筆記・口頭試験で必須の専門語彙
▶
| 日本語 (漢字) | 読み方 (ふりがな) | English | 試験での使い方 / Exam Usage |
|---|---|---|---|
| 技術士二次試験 | ぎじゅつしにじしけん | PE Second Examination | 筆記試験 (7月) + 口頭試験 (1月) の2段階。合格率は約10〜15%。 |
| 必須科目 | ひっすかもく | Essential Subject | 択一式30分 + 記述式90分。技術マネジメント・倫理・社会背景を論述。 |
| 選択科目 | せんたくかもく | Technical Subject | Ⅱ-1短答 (600字×2) · Ⅱ-2解答論文 (1800字) · Ⅲ応用 (2100字) |
| 口頭試験 | こうとうしけん | Oral Examination | 筆記合格者のみ受験。業務経歴と技術的体験を20分間の面接で審査。 |
| 業務経歴書 | ぎょうむけいれきしょ | Professional Experience Record | 口頭試験の主な質問元。5件以上の業務経歴を具体的に記載。 |
| 技術的体験論文 | ぎじゅつてきたいけんろんぶん | Technical Experience Essay | 二次試験申込時に提出。口頭試験で詳細に問われる核心書類。 |
| 公益確保の責務 | こうえきかくほのせきむ | Public Interest Duty | 技術士法第45条の2。「公衆の安全、健康及び福利」を最優先する義務。 |
| 有効応力 | ゆうこうおうりょく | Effective Stress (σ') | σ' = σ − u。全ての土質力学計算の基本原理。論文で必ず明示する。 |
| 間隙水圧 | かんげきすいあつ | Pore Water Pressure (u) | 過剰間隙水圧 (Δu) が地盤の不安定化を引き起こす。液状化・圧密と直結。 |
| 圧密沈下 | あつみつちんか | Consolidation Settlement | Sc = Cc/(1+e₀) × H × log(σ'f/σ'₀)。選択科目Ⅱ-1の頻出計算問題。 |
| 過圧密比 | かあつみつひ | Overconsolidation Ratio (OCR) | OCR = pc'/σ'v。OCR>1で過圧密、OCR=1で正規圧密。沈下量に大きく影響。 |
| せん断強度 | せんだんきょうど | Shear Strength (τ) | τ = c' + σ' tanφ' (モール・クーロン式)。斜面安定・支持力計算の基礎。 |
| 液状化対策 | えきじょうかたいさく | Liquefaction Countermeasures | 締固め工法 (サンドコンパクション)・排水工法・固化工法 (深層混合処理) を比較論述。 |
| 深層混合処理 | しんそうこんごうしょり | Deep Mixing Method (DMM) | CDM工法。セメントスラリーを地盤注入し柱状改良体 (ちゅうじょうかいりょうたい) を造成。 |
| 動的解析 | どうてきかいせき | Dynamic Analysis | 地震時の地盤応答 (じしんじのじばんおうとう) を時刻歴解析 (じこくれきかいせき) で評価。SHAKE、DYNEQ等使用。 |
| 地盤反力係数 | じばんはんりょくけいすう | Subgrade Reaction Coefficient (k) | k = p/y。杭・矢板・基礎板の弾性地盤解析に使用。単位 kN/m³。 |
| 負の摩擦力 | ふのまさつりょく | Negative Skin Friction | 軟弱地盤の沈下により杭に作用する下向き摩擦力。杭の支持力を低減させる。 |
| 変形係数 | へんけいけいすう | Deformation Modulus (E₅₀) | プレッシャーメーター試験・平板載荷試験から得る地盤剛性指標。即時沈下算定に使用。 |
| 崩壊機構 | ほうかいきこう | Failure Mechanism | 塑性限界解析 (そせいげんかいかいせき / plastic limit analysis) における破壊モードの特定。斜面・基礎設計で使用。 |
| 法面工 | のりめんこう | Slope Protection Works | 吹付けモルタル (ふきつけモルタル)・グラウンドアンカー・鉄筋挿入工 (てっきんそうにゅうこう) を場面ごとに選定。 |
| 盛土設計 | もりどせっけい | Embankment Design | 安定計算 (Bishop法)・沈下計算・排水設計 (はいすいせっけい) の3要素を統合して設計。 |
| 場所打ち杭 | ばしょうちぐい | Bored Pile / Cast-in-Place Pile | アース ドリル工法・リバース工法・ベノト工法。支持層 (しじそう) への根入れ深さが重要。 |
| 既製杭 | きせいぐい | Precast Pile | 鋼管杭 (こうかんぐい)・PHC杭・H形鋼杭。打込み (うちこみ)・埋込み (うめこみ) 工法で施工。 |
| リスクマネジメント | リスクマネジメント | Risk Management | 必須科目の頻出テーマ。リスク特定 (とくてい)・評価 (ひょうか)・対応 (たいおう)・監視 (かんし) の4プロセスで論述。 |
| 持続可能な開発 | じぞくかのうなかいはつ | Sustainable Development (SDGs) | 技術士の必須科目で必ず問われる概念。環境・社会・経済の3要素のバランスを論述。 |
4 — 二次試験に必要な技術力 Core Exam Competencies
論述力 · 高度技術 · 倫理判断 · マネジメント
▶
論述力 Essay Writing (記述式)
問題提起 (もんだいていき) — Problem identification in 600–2100字
課題解決策 (かだいかいけつさく) — Solution proposals with engineering rationale
リスク評価 (リスクひょうか) — Risk identification and mitigation in essay form
技術的根拠 (ぎじゅつてきこんきょ) — Citing Japanese standards (JIS/JGS/道示)
高度地盤技術 Advanced Geotechnics
FEM地盤解析 (有限要素法) — 地盤変形・浸透・動的解析
液状化対策工法 (えきじょうかたいさくこうほう) selection & design
深層混合処理 (CDM) and 地盤改良効果検証
杭基礎設計 (くいきそせっけい) — 負の摩擦力, 群杭効果 (ぐんくいこうか)
技術倫理 Ethics & Law
技術士法 全条文の適用判断
公益確保 vs 依頼者利益 — scenario decisions
技術者倫理事例分析 (じれいぶんせき) — past failures
内部告発 (ないぶこくはつ / whistleblowing) 義務と限界
技術マネジメント Management
工程管理 (こうていかんり) — PERT/CPM, critical path
品質管理 (ひんしつかんり) — ISO 9001, PDCA, QC7つ道具
コスト管理 (コストかんり) — EVM (出来高管理), VE/VA
安全管理 (あんぜんかんり) — KYK, TBM, ゼロ災運動
5 — 6段階学習ロードマップ 6-Level Study Roadmap
二次試験合格への段階的学習 — 日本語用語を全行に掲載
▶
L1
試験制度の理解 Exam Structure
二次試験の仕組み · 必須科目 · 業務経歴書の書き方
0/3
二次試験の構造理解 (にじしけんのこうぞうりかい) — Exam Architecture
筆記試験 (ひっきしけん) の全科目構成を把握する：
① 必須科目 (ひっすかもく)：択一式 (たくいつしき) 15問×2点 + 記述式 (きじゅつしき) 2問×30点 = 合計90点
② 選択科目Ⅱ-1 (せんたくかもくにのいち)：600字×2問 — 専門知識 (せんもんちしき) の短答論文
③ 選択科目Ⅱ-2 (せんたくかもくにのに)：1800字×1問 — 応用能力 (おうようのうりょく) の問題解決論文
④ 選択科目Ⅲ (せんたくかもくさん)：2100字×1問 — 問題解決能力 (もんだいかいけつのうりょく) と課題遂行能力 (かだいすいこうのうりょく)
合格基準 (ごうかくきじゅん)：必須科目50%以上 + 選択科目各50%以上。科目別に合否判定。
① 必須科目 (ひっすかもく)：択一式 (たくいつしき) 15問×2点 + 記述式 (きじゅつしき) 2問×30点 = 合計90点
② 選択科目Ⅱ-1 (せんたくかもくにのいち)：600字×2問 — 専門知識 (せんもんちしき) の短答論文
③ 選択科目Ⅱ-2 (せんたくかもくにのに)：1800字×1問 — 応用能力 (おうようのうりょく) の問題解決論文
④ 選択科目Ⅲ (せんたくかもくさん)：2100字×1問 — 問題解決能力 (もんだいかいけつのうりょく) と課題遂行能力 (かだいすいこうのうりょく)
合格基準 (ごうかくきじゅん)：必須科目50%以上 + 選択科目各50%以上。科目別に合否判定。
業務経歴書の作成 (ぎょうむけいれきしょのさくせい) — Writing the Experience Record
業務経歴書 (ぎょうむけいれきしょ) は口頭試験 (こうとうしけん) の質問の根拠となる最重要書類。記載要件：
・業務内容 (ぎょうむないよう)：担当した調査・設計・施工管理の具体的内容
・技術的課題 (ぎじゅつてきかだい)：その業務で直面した技術的問題点
・解決策 (かいけつさく)：どのような技術的判断 (ぎじゅつてきはんだん) で解決したか
・成果 (せいか)：定量的 (ていりょうてき / quantitative) な結果と社会的意義 (しゃかいてきいぎ / social significance)
5件以上の業務について「STAR形式」(状況・課題・行動・結果) で記述し、技術的体験論文 (ぎじゅつてきたいけんろんぶん) の素材として磨く。
・業務内容 (ぎょうむないよう)：担当した調査・設計・施工管理の具体的内容
・技術的課題 (ぎじゅつてきかだい)：その業務で直面した技術的問題点
・解決策 (かいけつさく)：どのような技術的判断 (ぎじゅつてきはんだん) で解決したか
・成果 (せいか)：定量的 (ていりょうてき / quantitative) な結果と社会的意義 (しゃかいてきいぎ / social significance)
5件以上の業務について「STAR形式」(状況・課題・行動・結果) で記述し、技術的体験論文 (ぎじゅつてきたいけんろんぶん) の素材として磨く。
必須科目の論述戦略 (ひっすかもくのろんじゅつせんりゃく) — Essential Subject Essay Strategy
必須科目の記述式問題は「社会的背景 (しゃかいてきはいけい) → 技術的課題 (ぎじゅつてきかだい) → 解決策 (かいけつさく) → リスク (リスク) → 倫理的考察 (りんりてきこうさつ)」の流れで論述する。
頻出テーマ：少子高齢化 (しょうしこうれいか) 時代の社会インフラ維持管理 (いじかんり)、カーボンニュートラル (カーボンニュートラル) と建設業の役割、DX推進 (ディーエックスすいしん / Digital Transformation) による業務効率化、気候変動適応策 (きこうへんどうてきおうさく) の実装。
過去10年の問題を分析し、各テーマで600字の骨子 (こっし / outline) を事前作成すること。
頻出テーマ：少子高齢化 (しょうしこうれいか) 時代の社会インフラ維持管理 (いじかんり)、カーボンニュートラル (カーボンニュートラル) と建設業の役割、DX推進 (ディーエックスすいしん / Digital Transformation) による業務効率化、気候変動適応策 (きこうへんどうてきおうさく) の実装。
過去10年の問題を分析し、各テーマで600字の骨子 (こっし / outline) を事前作成すること。
L2
高度地盤工学 Advanced Geotechnics
地盤改良 · 杭基礎 · 液状化対策 · 動的解析
0/4
地盤改良工法 (じばんかいりょうこうほう) — Ground Improvement Methods
選択科目Ⅲで頻出の比較・選定問題。各工法の原理・適用条件・施工管理を習得する：
・深層混合処理工法 (しんそうこんごうしょりこうほう)：CDM/DJM工法。セメント系固化材 (こかざい) を原位置 (げんいち) 混合。改良柱体 (かいりょうちゅうたい) の一軸圧縮強度 (いちじくあっしゅくきょうど qu) を管理指標とする。
・サンドコンパクション工法 (サンドコンパクションこうほう)：砂杭 (すなぐい) 打設による液状化防止 (えきじょうかぼうし) と締固め。相対密度 (そうたいみつど Dr) が改善指標。
・真空圧密工法 (しんくうあつみつこうほう)：バーチカルドレーン (vertical drain) + 真空圧を用いた軟弱地盤の事前圧密 (じぜんあつみつ)。圧密度 (あつみつど U) を管理。
・高圧噴射撹拌工法 (こうあつふんしゃかくはんこうほう)：JSG工法。高圧水と固化材噴射で大径改良体 (だいけいかいりょうたい) 造成。
・深層混合処理工法 (しんそうこんごうしょりこうほう)：CDM/DJM工法。セメント系固化材 (こかざい) を原位置 (げんいち) 混合。改良柱体 (かいりょうちゅうたい) の一軸圧縮強度 (いちじくあっしゅくきょうど qu) を管理指標とする。
・サンドコンパクション工法 (サンドコンパクションこうほう)：砂杭 (すなぐい) 打設による液状化防止 (えきじょうかぼうし) と締固め。相対密度 (そうたいみつど Dr) が改善指標。
・真空圧密工法 (しんくうあつみつこうほう)：バーチカルドレーン (vertical drain) + 真空圧を用いた軟弱地盤の事前圧密 (じぜんあつみつ)。圧密度 (あつみつど U) を管理。
・高圧噴射撹拌工法 (こうあつふんしゃかくはんこうほう)：JSG工法。高圧水と固化材噴射で大径改良体 (だいけいかいりょうたい) 造成。
杭基礎の高度設計 (くいきそのこうどせっけい) — Advanced Pile Foundation Design
・支持力算定 (しじりょくさんてい)：杭先端支持力 (くいせんたんしじりょく) + 周面摩擦力 (しゅうめんまさつりょく) の積み上げ。道路橋示方書 (どうろきょうしほうしょ) の極限支持力 (きょくげんしじりょく) 計算式を習得。
・負の摩擦力 (ふのまさつりょく / Negative Skin Friction)：軟弱地盤の圧密沈下が杭を下方に引く力。中立点 (ちゅうりつてん / neutral plane) 深度の決定方法。
・群杭効果 (ぐんくいこうか / Group Pile Effect)：杭間隔が3D未満で発生する地盤変形の相互干渉。効率係数 (こうりつけいすう η) による支持力低減。
・水平抵抗 (すいへいていこう / Lateral Resistance)：Chang法・Chang-修正法による杭の水平変位と曲げモーメント分布。地盤反力係数 (じばんはんりょくけいすう k) の設定が重要。
・負の摩擦力 (ふのまさつりょく / Negative Skin Friction)：軟弱地盤の圧密沈下が杭を下方に引く力。中立点 (ちゅうりつてん / neutral plane) 深度の決定方法。
・群杭効果 (ぐんくいこうか / Group Pile Effect)：杭間隔が3D未満で発生する地盤変形の相互干渉。効率係数 (こうりつけいすう η) による支持力低減。
・水平抵抗 (すいへいていこう / Lateral Resistance)：Chang法・Chang-修正法による杭の水平変位と曲げモーメント分布。地盤反力係数 (じばんはんりょくけいすう k) の設定が重要。
液状化対策の設計 (えきじょうかたいさくのせっけい) — Liquefaction Countermeasure Design
液状化 (えきじょうか / liquefaction) 判定から対策設計まで一貫して習得する：
① FL値算定 (エフエルちさんてい)：液状化抵抗率 RL / 地震時せん断応力比 L。FL < 1.0で液状化発生。
② PL値 (ピーエルち / Liquefaction Potential Index)：地表面への液状化被害の深刻度評価。PL > 15で甚大被害。
③ 対策工法選定 (たいさくこうほうせんてい)：
・締固め工法 (しめかためこうほう)：SCP (サンドコンパクション)・振動棒 (しんどうぼう / Vibroflotation)
・排水工法 (はいすいこうほう)：グラベルドレーン (gravel drain) による過剰間隙水圧 (かじょうかんげきすいあつ) 消散
・固化工法 (こかこうほう)：深層混合処理による剛性改善
各工法の適用限界 (てきようげんかい)・経済性 (けいざいせい)・施工性 (せこうせい) を論文で比較できるよう整理する。
① FL値算定 (エフエルちさんてい)：液状化抵抗率 RL / 地震時せん断応力比 L。FL < 1.0で液状化発生。
② PL値 (ピーエルち / Liquefaction Potential Index)：地表面への液状化被害の深刻度評価。PL > 15で甚大被害。
③ 対策工法選定 (たいさくこうほうせんてい)：
・締固め工法 (しめかためこうほう)：SCP (サンドコンパクション)・振動棒 (しんどうぼう / Vibroflotation)
・排水工法 (はいすいこうほう)：グラベルドレーン (gravel drain) による過剰間隙水圧 (かじょうかんげきすいあつ) 消散
・固化工法 (こかこうほう)：深層混合処理による剛性改善
各工法の適用限界 (てきようげんかい)・経済性 (けいざいせい)・施工性 (せこうせい) を論文で比較できるよう整理する。
地震時動的解析 (じしんじどうてきかいせき) — Seismic Dynamic Analysis
・地盤応答解析 (じばんおうとうかいせき / Ground Response Analysis)：SHAKE・DYNEQ・FLIP等のプログラムを用いた1次元等価線形解析 (いちじげんとうかせんけいかいせき)。入力地震動 (にゅうりょくじしんどう) の設定と地盤増幅 (じばんぞうふく / site amplification) 評価。
・Vs30 (ブイエスさんじゅう)：地表から30mの平均S波速度 (へいきんエスはそくど)。地盤種別 (じばんしゅべつ) 判定と設計用地震力の基準。国交省・道路橋示方書で規定。
・有効応力解析 (ゆうこうおうりょくかいせき / Effective Stress Analysis)：FLIP・LIQCA等。液状化時の間隙水圧発生 (かんげきすいあつはっせい) と地盤変形を時刻歴 (じこくれき / time history) で追跡。
・地震ハザード解析 (じしんハザードかいせき)：確率論的地震ハザード解析 (PSHA) による設計地震動 (せっけいじしんどう) の設定根拠を理解する。
・Vs30 (ブイエスさんじゅう)：地表から30mの平均S波速度 (へいきんエスはそくど)。地盤種別 (じばんしゅべつ) 判定と設計用地震力の基準。国交省・道路橋示方書で規定。
・有効応力解析 (ゆうこうおうりょくかいせき / Effective Stress Analysis)：FLIP・LIQCA等。液状化時の間隙水圧発生 (かんげきすいあつはっせい) と地盤変形を時刻歴 (じこくれき / time history) で追跡。
・地震ハザード解析 (じしんハザードかいせき)：確率論的地震ハザード解析 (PSHA) による設計地震動 (せっけいじしんどう) の設定根拠を理解する。
L3
構造物・斜面設計 Structures & Slopes
斜面安定 · 盛土 · トンネル · 地下構造物
0/3
斜面安定解析 (しゃめんあんていかいせき) — Slope Stability Analysis
・ビショップ法 (Bishop法)：円弧すべり面 (えんこすべりめん / circular slip surface) の安全率 (あんぜんりつ Fs) 算定。繰り返し計算 (くりかえしけいさん / iteration) で解収束。最小安全率 (さいしょうあんぜんりつ) の探索が重要。
・不円弧すべり (Morgenstern-Price法・Janbu法)：非円弧すべり面 (ひえんこすべりめん / non-circular surface) に対応。岩盤斜面 (がんばんしゃめん) の解析に有効。
・対策工の設計 (たいさくこうのせっけい)：
グラウンドアンカー (ground anchor)：アンカー力 (アンカーりょく) の設計と引抜き試験 (ひきぬきしけん) による確認
杭工法 (くいこうほう)：抑止杭 (よくしぐい / stabilising pile) の水平抵抗設計
鉄筋挿入工 (てっきんそうにゅうこう / soil nailing)：挿入鉄筋の引抜き抵抗と配置設計
・不円弧すべり (Morgenstern-Price法・Janbu法)：非円弧すべり面 (ひえんこすべりめん / non-circular surface) に対応。岩盤斜面 (がんばんしゃめん) の解析に有効。
・対策工の設計 (たいさくこうのせっけい)：
グラウンドアンカー (ground anchor)：アンカー力 (アンカーりょく) の設計と引抜き試験 (ひきぬきしけん) による確認
杭工法 (くいこうほう)：抑止杭 (よくしぐい / stabilising pile) の水平抵抗設計
鉄筋挿入工 (てっきんそうにゅうこう / soil nailing)：挿入鉄筋の引抜き抵抗と配置設計
盛土・軟弱地盤対策 (もりど・なんじゃくじばんたいさく) — Embankment on Soft Ground
・段階施工法 (だんかいせこうほう / Stage Construction)：軟弱地盤上の盛土を圧密強度増加 (あつみつきょうどぞうか / strength gain from consolidation) を確認しながら段階的に施工。安定管理 (あんていかんり) の指標：側方変位 (そくほうへんい / lateral displacement)・盛土中央沈下 (ちゅうおうちんか)・間隙水圧比 (かんげきすいあつひ)。
・圧密促進工法 (あつみつそくしんこうほう)：鉛直ドレーン (vertical drain) を用いた圧密時間の短縮。バーチカルドレーンの設計：ドレーン径 (径 D)・打設間隔 (だせつかんかく S)・排水距離 (はいすいきょり R) の関係。
・軽量盛土工法 (けいりょうもりどこうほう)：EPS (発泡スチロール / Expanded Polystyrene) 盛土や軽量気泡混合土 (けいりょうきほうこんごうど / foamed lightweight soil) による荷重軽減。
・圧密促進工法 (あつみつそくしんこうほう)：鉛直ドレーン (vertical drain) を用いた圧密時間の短縮。バーチカルドレーンの設計：ドレーン径 (径 D)・打設間隔 (だせつかんかく S)・排水距離 (はいすいきょり R) の関係。
・軽量盛土工法 (けいりょうもりどこうほう)：EPS (発泡スチロール / Expanded Polystyrene) 盛土や軽量気泡混合土 (けいりょうきほうこんごうど / foamed lightweight soil) による荷重軽減。
地下構造物・トンネル (ちかこうぞうぶつ・トンネル) — Underground Structures
・シールドトンネル (shield tunnel)：泥土圧 (でいどあつ) ・泥水式 (でいすいしき) シールドの切羽安定 (きりはあんてい / face stability) 管理。テールボイド (tail void) への裏込め注入 (うらごめちゅうにゅう / back grouting) と沈下 (ちんか) 制御。
・山岳トンネル — NATM (New Austrian Tunnelling Method)：岩盤分類 (がんばんぶんるい / rock mass classification) RMR・Q-system・日本の地山等級 (じやまとうきゅう) による支保パターン (しほパターン / support pattern) 選定。吹付けコンクリート (ふきつけコンクリート / shotcrete) とロックボルト (rock bolt) の設計。
・開削工法 (かいさくこうほう / Cut-and-Cover)：土留め工 (どどめこう) — 親杭横矢板 (おやぐいよこやいた)・鋼矢板 (こうやいた / sheet pile)・地中連続壁 (ちちゅうれんぞくへき / diaphragm wall) の選定と根入れ深さ (ねいれふかさ) 計算。
・山岳トンネル — NATM (New Austrian Tunnelling Method)：岩盤分類 (がんばんぶんるい / rock mass classification) RMR・Q-system・日本の地山等級 (じやまとうきゅう) による支保パターン (しほパターン / support pattern) 選定。吹付けコンクリート (ふきつけコンクリート / shotcrete) とロックボルト (rock bolt) の設計。
・開削工法 (かいさくこうほう / Cut-and-Cover)：土留め工 (どどめこう) — 親杭横矢板 (おやぐいよこやいた)・鋼矢板 (こうやいた / sheet pile)・地中連続壁 (ちちゅうれんぞくへき / diaphragm wall) の選定と根入れ深さ (ねいれふかさ) 計算。
L4
技術論文の作成 Technical Essay Writing
論文構成 · 記述技術 · 日本語専門文章 · 過去問分析
0/3
選択科目Ⅱ・Ⅲの論文構成 (ろんぶんこうせい) — Essay Structure for Ⅱ & Ⅲ
選択科目Ⅱ-2 (1800字) の標準構成：
① 問題の背景 (もんだいのはいけい)：なぜこの技術課題が重要か — 社会的・技術的背景を1〜2段落で
② 技術的課題 (ぎじゅつてきかだい)：具体的な課題を3点程度列挙
③ 解決策 (かいけつさく)：各課題への技術的アプローチを 「〜工法を採用し (さいようし)、〜を実施することで〜が期待できる」 形式で記述
④ リスクと対策 (リスクとたいさく)：想定されるリスク (じゃくてん / weakness) と対応策
選択科目Ⅲ (2100字) では上記に加え「技術者としての倫理的考察 (りんりてきこうさつ)」と「社会への影響 (しゃかいへのえいきょう)」を必ず論述。
キーワード：課題解決 (かだいかいけつ)・最適化 (さいてきか)・持続可能性 (じぞくかのうせい)・安全性 (あんぜんせい)・経済性 (けいざいせい)・環境負荷 (かんきょうふか)
① 問題の背景 (もんだいのはいけい)：なぜこの技術課題が重要か — 社会的・技術的背景を1〜2段落で
② 技術的課題 (ぎじゅつてきかだい)：具体的な課題を3点程度列挙
③ 解決策 (かいけつさく)：各課題への技術的アプローチを 「〜工法を採用し (さいようし)、〜を実施することで〜が期待できる」 形式で記述
④ リスクと対策 (リスクとたいさく)：想定されるリスク (じゃくてん / weakness) と対応策
選択科目Ⅲ (2100字) では上記に加え「技術者としての倫理的考察 (りんりてきこうさつ)」と「社会への影響 (しゃかいへのえいきょう)」を必ず論述。
キーワード：課題解決 (かだいかいけつ)・最適化 (さいてきか)・持続可能性 (じぞくかのうせい)・安全性 (あんぜんせい)・経済性 (けいざいせい)・環境負荷 (かんきょうふか)
日本語技術文章の訓練 (にほんごぎじゅつぶんしょうのくんれん) — Japanese Technical Writing Practice
試験は全て日本語 (ぜんてにほんご) で記述。以下の表現パターンを暗記する：
・課題提起：「〜において、〜という問題 (もんだい) が生じている (しょうじている)。この解決には〜が必要である。」
・技術提案：「〜を採用することで (さいようすることで)、〜を低減 (ていげん) し、〜の向上 (こうじょう) が図れる (はかれる)。」
・リスク表現：「〜の懸念 (けねん) があるため (があるため)、〜のモニタリング (モニタリング) を継続的 (けいぞくてき) に実施する (じっしする) 必要がある。」
・倫理表現：「技術者として (ぎじゅつしゃとして)、公衆の安全 (こうしゅうのあんぜん) を最優先 (さいゆうせん) に考慮 (こうりょ) し、〜を判断 (はんだん) する。」
週1本の論文を実際に手書きし、制限時間内に書き切る訓練 (くんれん) を積む。
・課題提起：「〜において、〜という問題 (もんだい) が生じている (しょうじている)。この解決には〜が必要である。」
・技術提案：「〜を採用することで (さいようすることで)、〜を低減 (ていげん) し、〜の向上 (こうじょう) が図れる (はかれる)。」
・リスク表現：「〜の懸念 (けねん) があるため (があるため)、〜のモニタリング (モニタリング) を継続的 (けいぞくてき) に実施する (じっしする) 必要がある。」
・倫理表現：「技術者として (ぎじゅつしゃとして)、公衆の安全 (こうしゅうのあんぜん) を最優先 (さいゆうせん) に考慮 (こうりょ) し、〜を判断 (はんだん) する。」
週1本の論文を実際に手書きし、制限時間内に書き切る訓練 (くんれん) を積む。
過去問分析と頻出テーマ (かこもんぶんせきとひんしゅつテーマ) — Past Paper Analysis
建設部門・土質及び基礎 (どしつおよびきそ) の過去10年の選択科目を分析。頻出テーマ別出現率：
・軟弱地盤対策 (なんじゃくじばんたいさく)：ほぼ毎年出題。圧密・液状化・改良工法をセットで準備。
・斜面崩壊対策 (しゃめんほうかいたいさく)：降雨時 (こうういじ) の斜面不安定化と対策工の設計。
・盛土施工管理 (もりどせこうかんり)：段階施工・安定管理の方法。
・環境への配慮 (かんきょうへのはいりょ)：建設発生土 (けんせつはっせいど) の有効利用・生態系保全 (せいたいけいほぜん)。
・維持管理・更新 (いじかんり・こうしん)：老朽化インフラ (ろうきゅうかインフラ) の診断・補修・更新技術。
各テーマで「課題3点＋解決策3点＋リスク1点」の箇条書き骨子 (こっし / outline) を準備する。
・軟弱地盤対策 (なんじゃくじばんたいさく)：ほぼ毎年出題。圧密・液状化・改良工法をセットで準備。
・斜面崩壊対策 (しゃめんほうかいたいさく)：降雨時 (こうういじ) の斜面不安定化と対策工の設計。
・盛土施工管理 (もりどせこうかんり)：段階施工・安定管理の方法。
・環境への配慮 (かんきょうへのはいりょ)：建設発生土 (けんせつはっせいど) の有効利用・生態系保全 (せいたいけいほぜん)。
・維持管理・更新 (いじかんり・こうしん)：老朽化インフラ (ろうきゅうかインフラ) の診断・補修・更新技術。
各テーマで「課題3点＋解決策3点＋リスク1点」の箇条書き骨子 (こっし / outline) を準備する。
L5
口頭試験対策 Oral Exam Preparation
面接シミュレーション · 業務経歴の深掘り · 倫理事例
0/3
口頭試験の頻出質問 (ひんしゅつしつもん) — Typical Oral Exam Questions
口頭試験 (20分) は主に業務経歴書 (ぎょうむけいれきしょ) をもとに試問される。準備必須の質問パターン：
① 「最も技術的に困難だった業務 (もっともぎじゅつてきにこんなんだったぎょうむ) はどれですか？具体的に説明してください。」
② 「その業務で技術的判断 (ぎじゅつてきはんだん) が求められた場面を教えてください。」
③ 「公益確保 (こうえきかくほ) の観点から難しい判断をした経験はありますか？」
④ 「技術士として今後どのような継続研鑚 (けいぞくけんさん) を行いますか？」
⑤ 「失敗した経験 (しっぱいしたけいけん) とそこから学んだことを教えてください。」
各質問に対して2〜3分で答えられる日本語のスクリプトを準備し、模擬面接 (もぎめんせつ / mock interview) を繰り返す。
① 「最も技術的に困難だった業務 (もっともぎじゅつてきにこんなんだったぎょうむ) はどれですか？具体的に説明してください。」
② 「その業務で技術的判断 (ぎじゅつてきはんだん) が求められた場面を教えてください。」
③ 「公益確保 (こうえきかくほ) の観点から難しい判断をした経験はありますか？」
④ 「技術士として今後どのような継続研鑚 (けいぞくけんさん) を行いますか？」
⑤ 「失敗した経験 (しっぱいしたけいけん) とそこから学んだことを教えてください。」
各質問に対して2〜3分で答えられる日本語のスクリプトを準備し、模擬面接 (もぎめんせつ / mock interview) を繰り返す。
倫理事例の深掘り (りんりじれいのふかぼり) — Ethics Case Study Deep Dive
口頭試験で必ず問われる倫理事例を体系的に準備する：
・データ改竄 (データかいざん / Data Falsification)：地盤調査データを依頼者の都合で書き換えるよう求められた場合の対応。守秘義務 (しゅひぎむ) と公益確保 (こうえきかくほ) のバランス。
・利益相反 (りえきそうはん / Conflict of Interest)：設計者と施工者を兼任する状況での技術的中立性 (ぎじゅつてきちゅうりつせい) の確保。
・危険の告知 (きけんのこくち / Duty to Warn)：施工中に想定外の軟弱層 (なんじゃくそう) を発見した場合の報告義務 (ほうこくぎむ) と施工停止 (せこうていし / work stoppage) の判断。
・内部告発 (ないぶこくはつ / Whistleblowing)：上司が安全基準 (あんぜんきじゅん) を無視している場合の段階的対応 (だんかいてきたいおう)：上司→組織→行政→社会。
実際の判例 (はんれい / court cases) と技術士法違反事例 (ぎじゅつしほういはんじれい) を研究する。
・データ改竄 (データかいざん / Data Falsification)：地盤調査データを依頼者の都合で書き換えるよう求められた場合の対応。守秘義務 (しゅひぎむ) と公益確保 (こうえきかくほ) のバランス。
・利益相反 (りえきそうはん / Conflict of Interest)：設計者と施工者を兼任する状況での技術的中立性 (ぎじゅつてきちゅうりつせい) の確保。
・危険の告知 (きけんのこくち / Duty to Warn)：施工中に想定外の軟弱層 (なんじゃくそう) を発見した場合の報告義務 (ほうこくぎむ) と施工停止 (せこうていし / work stoppage) の判断。
・内部告発 (ないぶこくはつ / Whistleblowing)：上司が安全基準 (あんぜんきじゅん) を無視している場合の段階的対応 (だんかいてきたいおう)：上司→組織→行政→社会。
実際の判例 (はんれい / court cases) と技術士法違反事例 (ぎじゅつしほういはんじれい) を研究する。
CPD計画と継続研鑚 (シーピーディーけいかくとけいぞくけんさん) — CPD Planning
技術士としての継続研鑚義務 (けいぞくけんさんぎむ / mandatory CPD) を満たすための計画を立てる：
・CPD単位 (シーピーディーたんい / CPD credits)：IPEJ認定の講習会 (こうしゅうかい)・技術発表 (ぎじゅつはっぴょう)・論文執筆 (ろんぶんしっぴつ)・現場研修 (げんばけんしゅう) で取得。年間50単位推奨。
・学会発表 (がっかいはっぴょう / Academic Presentation)：地盤工学会 (JGS)・土木学会 (JSCE)・物理探査学会 (SEGJ) での論文投稿と発表。
・国際資格との連携 (こくさいしかくとのれんけい)：ワシントン協定 (Washington Accord) 加盟国のPE資格との相互承認を活用した海外CPD。
・後進育成 (こうしんいくせい / Mentoring)：技術士補の指導技術士 (しどうぎじゅつし) として若手の業務指導。自身の技術力向上にも繋がる。
・CPD単位 (シーピーディーたんい / CPD credits)：IPEJ認定の講習会 (こうしゅうかい)・技術発表 (ぎじゅつはっぴょう)・論文執筆 (ろんぶんしっぴつ)・現場研修 (げんばけんしゅう) で取得。年間50単位推奨。
・学会発表 (がっかいはっぴょう / Academic Presentation)：地盤工学会 (JGS)・土木学会 (JSCE)・物理探査学会 (SEGJ) での論文投稿と発表。
・国際資格との連携 (こくさいしかくとのれんけい)：ワシントン協定 (Washington Accord) 加盟国のPE資格との相互承認を活用した海外CPD。
・後進育成 (こうしんいくせい / Mentoring)：技術士補の指導技術士 (しどうぎじゅつし) として若手の業務指導。自身の技術力向上にも繋がる。
L6
最終仕上げ Final Preparation
模擬試験 · 本番直前確認 · 登録手続き · 総合技術監理
0/3
模擬試験と弱点補強 (もぎしけんとじゃくてんほきょう) — Mock Exams & Weak Point Drills
本番 (7月) の3ヶ月前から以下のスケジュールで総仕上げ：
・月1回の完全模擬試験 (もぎしけん)：必須科目 (120分) + 選択科目 (3.5時間) を通しで実施。手書き (てがき) で字数制限 (じすうせいげん) を守る訓練。
・採点基準 (さいてんきじゅん) で自己評価：IPEJ発表の出題趣旨 (しゅつだいしゅし / question intent) と比較し、技術的正確性 (ぎじゅつてきせいかくせい)・論旨明確性 (ろんしめいかくせい)・倫理考察 (りんりこうさつ) の3点で採点。
・弱点テーマの集中演習 (しゅうちゅうえんしゅう)：模擬試験で低得点だったテーマの追加論文執筆。キーワード帳 (キーワードちょう) に重要用語と定義を整理し、直前まで反復確認 (はんぷくかくにん)。
・受験仲間 (じゅけんなかま / study partners) と相互添削 (そうごてんさく / peer review) を実施。
・月1回の完全模擬試験 (もぎしけん)：必須科目 (120分) + 選択科目 (3.5時間) を通しで実施。手書き (てがき) で字数制限 (じすうせいげん) を守る訓練。
・採点基準 (さいてんきじゅん) で自己評価：IPEJ発表の出題趣旨 (しゅつだいしゅし / question intent) と比較し、技術的正確性 (ぎじゅつてきせいかくせい)・論旨明確性 (ろんしめいかくせい)・倫理考察 (りんりこうさつ) の3点で採点。
・弱点テーマの集中演習 (しゅうちゅうえんしゅう)：模擬試験で低得点だったテーマの追加論文執筆。キーワード帳 (キーワードちょう) に重要用語と定義を整理し、直前まで反復確認 (はんぷくかくにん)。
・受験仲間 (じゅけんなかま / study partners) と相互添削 (そうごてんさく / peer review) を実施。
登録手続きと名称表示 (とうろくてつづきとめいしょうひょうじ) — Registration & Title Use
筆記試験合格 (1月発表) → 口頭試験合格 (3月発表) → 登録申請 (とうろくしんせい) の流れ：
・登録申請書類 (とうろくしんせいしょるい)：技術士登録申請書・合格証書 (ごうかくしょうしょ) のコピー・登録免許税 (とうろくめんきょぜい) ¥30,000 の収入印紙 (しゅうにゅういんし / revenue stamp)。
・名称表示義務 (めいしょうひょうじぎむ)：技術士法第46条。業務書類に「技術士 (建設部門)」と記名・押印 (おういん) する義務。無資格者の名称使用は名称独占 (めいしょうどくせん) 違反 (いはん) で罰則 (ばっそく) 対象。
・登録証 (とうろくしょう) 受領後、IPEJ支部への入会 (にゅうかい) を推奨。CPD管理・技術情報の入手・後進指導 (こうしんしどう) の機会を得られる。
・登録申請書類 (とうろくしんせいしょるい)：技術士登録申請書・合格証書 (ごうかくしょうしょ) のコピー・登録免許税 (とうろくめんきょぜい) ¥30,000 の収入印紙 (しゅうにゅういんし / revenue stamp)。
・名称表示義務 (めいしょうひょうじぎむ)：技術士法第46条。業務書類に「技術士 (建設部門)」と記名・押印 (おういん) する義務。無資格者の名称使用は名称独占 (めいしょうどくせん) 違反 (いはん) で罰則 (ばっそく) 対象。
・登録証 (とうろくしょう) 受領後、IPEJ支部への入会 (にゅうかい) を推奨。CPD管理・技術情報の入手・後進指導 (こうしんしどう) の機会を得られる。
総合技術監理部門への道 (そうごうぎじゅつかんりぶもんへのみち) — Path to Integrated Management
総合技術監理部門 (そうごうぎじゅつかんりぶもん / Integrated Technical Management) は技術士取得後に目指す上位資格。5つの管理視点 (かんりしてん) を統合する能力を証明する：
① 安全管理 (あんぜんかんり)：ゼロ災 (ぜろさい / zero accidents) に向けたリスク特定と制御
② 社会環境管理 (しゃかいかんきょうかんり)：環境影響評価 (かんきょうえいきょうひょうか / EIA) と持続可能な事業実施
③ 経済性管理 (けいざいせいかんり)：LCC (ライフサイクルコスト)・VE (バリューエンジニアリング) による最適化
④ 人的資源管理 (じんてきしげんかんり)：プロジェクトチームの組成・動機付け・能力開発
⑤ 情報管理 (じょうほうかんり)：BIM/CIM・ICT施工・データセキュリティ管理
必須科目は「総合技術監理の視点 (してん) からの技術管理論文」600字×2問。技術士取得から2〜3年の実務経験後に挑戦することを推奨。
① 安全管理 (あんぜんかんり)：ゼロ災 (ぜろさい / zero accidents) に向けたリスク特定と制御
② 社会環境管理 (しゃかいかんきょうかんり)：環境影響評価 (かんきょうえいきょうひょうか / EIA) と持続可能な事業実施
③ 経済性管理 (けいざいせいかんり)：LCC (ライフサイクルコスト)・VE (バリューエンジニアリング) による最適化
④ 人的資源管理 (じんてきしげんかんり)：プロジェクトチームの組成・動機付け・能力開発
⑤ 情報管理 (じょうほうかんり)：BIM/CIM・ICT施工・データセキュリティ管理
必須科目は「総合技術監理の視点 (してん) からの技術管理論文」600字×2問。技術士取得から2〜3年の実務経験後に挑戦することを推奨。
6 — 進捗サマリー Progress Overview
全6レベルの学習進捗 / Learning status across all 6 levels
▶
📋 試験情報 / Exam Information
主管機関 (しゅかんきかん): 公益社団法人日本技術士会 (IPEJ)
筆記試験 (ひっきしけん): 7月実施 · 必須科目 + 選択科目Ⅱ + 選択科目Ⅲ
口頭試験 (こうとうしけん): 翌年1月 · 筆記合格者のみ · 20分面接
合格率 (ごうかくりつ): 全体約10〜15% · 筆記約20% · 口頭約90%
筆記試験 (ひっきしけん): 7月実施 · 必須科目 + 選択科目Ⅱ + 選択科目Ⅲ
口頭試験 (こうとうしけん): 翌年1月 · 筆記合格者のみ · 20分面接
合格率 (ごうかくりつ): 全体約10〜15% · 筆記約20% · 口頭約90%
AI Tutor
// 個人AIチューター — 7-Step Deep Learning · 100% Offline · No API Required
// GEOTECHNICAL ENGINEERING
// JAPANESE LANGUAGE 🇯🇵
Professor Mode
// 11-Step Deep Learning — Engineering Intuition Builder
🌱 M1 Soil Mechanics
🪨 M2 Rock Mechanics
〜 M3 Wave Propagation
🔨 M4 In-situ Testing
⚡ M5 Geophysical Exploration
🏗 M6 Foundation Engineering
💧 M7 Liquefaction
📊 M8 Field Data Interpretation
🔬 M9 Investigation Methods
Field Data Lab
// 原位置データ解析 — Real Data Interpretation Training
🔨 SPT Log
📍 CPTu Graph
📡 PS Logging
🔵 Pressuremeter
🧮 Calc Problems
📊 SPT Borehole Log — BH-01
Depth (m) vs N-value. Click any layer for interpretation.
🔍 Layer Interpretation
← Click a layer on the log to interpret it.
💡 How to Read an SPT Log
1
Read the N-value trend
Low N (1–4) = very soft/loose. Increasing N with depth is normal. A sudden jump (e.g. N=5→45) often indicates a layer boundary or bedrock approach.
2
Check the groundwater depth
Noted as GWL on logs. Critical for effective stress calculations and liquefaction assessment. In Japan, GWL is commonly 1–3m below surface.
3
Correlate with soil description
N-value alone is not enough. Sandy layers with N<10 below GWL are liquefiable candidates. Clayey layers are assessed for consolidation settlement.
4
Engineering decisions from N
Foundation depth, pile tip depth, liquefaction risk zones, and ground improvement requirements all flow directly from the SPT log interpretation.
Study Plan
// 学習計画 — Structured daily program for exam preparation
DAILY TARGET
2.5 Hours
Concept 40min · Visual 20min · Problems 30min · Flashcards 20min · Field Data 30min
📊 Weekly Progress Tracker
// WEEK 1 — SOIL MECHANICS FOUNDATION 土質力学基礎
// WEEK 2 — WAVE PROPAGATION & FIELD TESTING 波動伝播・原位置試験
// WEEK 3 — GEOPHYSICS & DATA INTERPRETATION 物理探査・データ解析
// WEEK 4 — EXAM SPRINT 試験直前対策
Vocabulary Hub
// 語彙ハブ — Global bilingual technical + JLPT vocabulary system
🔍 Browse
🃏 Flashcard Mode
🔁 Spaced Review
⚡ Vocab Quiz
JLPT Study Hub
// 日本語能力試験 — N2 & N1 comprehensive preparation system
N2
日本語能力試験N2
Upper intermediate Japanese. Required for many engineering firms in Japan.
0 / 6000 vocab · 0% ready
N1
日本語能力試験N1
Advanced mastery. Required for technical report writing and client communication.
0 / 10000 vocab · 0% ready
// JLPT READINESS OVERVIEW
📋
N2 Readiness
—%
Vocabulary
Grammar
Reading
🏆
N1 Readiness
—%
Vocabulary
Grammar
Reading
Progress Analytics
// 学習分析 — Your personalized learning performance dashboard
⚡ Fast Learner Mode
Prioritize equations, advanced content, N1 vocab
🎯 Standard Mode
🔥
0
Day Study Streak
📖
0
Vocab Mastered
⚡
—%
Quiz Accuracy
🎯 JLPT Readiness
N2
0%
N1
0%
Complete quizzes and vocab reviews to improve
⚠️ Weak Topics
// TODAY'S STUDY PLAN
// ENGINEERING QUIZ PERFORMANCE
🌱 Soil Mechanics
No data yet
🌊 Wave Propagation
No data yet
🔬 Field Testing
No data yet
⚡ Geophysics
No data yet
🇯🇵 JLPT Vocabulary
No data yet
📝 Grammar Drills
No data yet
Smart Study
// スマート学習 — AI-powered personalized learning recommendations
// SMART LEARNING ENGINE — TODAY'S RECOMMENDATIONS
🧭 Your Learning Path
📊 Performance Analysis
🎯 Recommended Practice Mode
Daily Focus
// 今日の学習 — JLPT & Engineering License Exam Daily System
TODAY'S GOAL
0%
🇯🇵 JLPT Core
📐 Eng. Vocab
⚙ Concepts
🔁 Review
Block 1 — JLPT Core
Kanji · Vocabulary · Grammar · Reading
25 min
Block 2 — Engineering Japanese
Technical terms · Field vocabulary · Exam kanji
20 min
Block 3 — Engineering Concepts
Theory · Equations · Calculations · Problems
30 min
Block 4 — Review & Flashcards
Spaced repetition · Weak topics · Final quiz
20 min
// POMODORO FOCUS TIMER
25:00
FOCUS
Sessions today: 0/4
Block 1→2→3→4 = 4 Pomodoros = 1 complete study session
// WEAK TOPIC ALERT
// WEEKLY PLAN
// SPACED REPETITION DUE TODAY
Interactive Simulations
// シミュレーション — Change parameters, watch physics respond in real-time
// LIQUEFACTION SIMULATOR 液状化シミュレーター
💧 Soil Liquefaction Simulator
液状化現象 — 砂地盤の間隙水圧と有効応力
STABLE
Relative Density Dr (%)
50
Loose ←→ Dense
Earthquake Intensity (PGA g)
0.25
Weak ←→ Strong
Depth to Water Table (m)
1.0
Shallow ←→ Deep
1.45
FL = CRR/CSR
0.18
CSR (seismic demand)
0.26
CRR (soil resistance)
FL > 1.5: Low liquefaction risk.
// SLOPE STABILITY SIMULATOR 斜面安定解析
⛰ Slope Stability (Bishop Method)
斜面安定 — 安全率 Fs のリアルタイム計算
STABLE
Slope Angle β (°)
30
Cohesion c' (kPa)
20
Friction Angle φ' (°)
30
Rainfall Factor (%)
0
1.82
Fs (Factor of Safety)
54°
Critical slip angle
Fs > 1.5: Stable under current conditions.
// WAVE VELOCITY SIMULATOR 地震波速度
〜 P-Wave & S-Wave Propagation
弾性波の伝播速度シミュレーション
Bulk Modulus K (MPa)
200
Shear Modulus G (MPa)
80
Density ρ (kg/m³)
1800
513
Vp (m/s) P-Wave
211
Vs (m/s) S-Wave
2.43
Vp/Vs ratio
80
G₀ = ρVs² (MPa)
Knowledge Map
// 知識マップ — Click nodes to explore connections. Drag to pan.
Core Concepts
Soil Mechanics
Geophysics
Field Testing
Earthquake Eng.
🔗 Key Relationships
1
Effective Stress → Everything
σ' = σ − u controls shear strength, consolidation, liquefaction, and bearing capacity.
2
Vs → Site Amplification
Shear wave velocity Vs determines Vs30, site class, and seismic design amplification.
3
SPT N-value → Multiple Uses
N-value links to soil density, liquefaction resistance (CRR), and bearing capacity estimates.
📊 Topic Mastery
Real Case Studies
// 実際の事例 — Learn from history's most important geotechnical disasters
1964
M7.5
Niigata Earthquake Liquefaction
📍 新潟市, Niigata, Japan
The 1964 Niigata earthquake triggered massive liquefaction in the city's alluvial plain, causing apartment buildings to tilt and sink into the ground while remaining structurally intact — a defining moment in geotechnical engineering history.
Engineering Lessons
Loose saturated sand with N < 10 is extremely vulnerable to liquefaction
Lateral spreading of ground caused extensive foundation damage
Pioneered Japan's FL-based liquefaction assessment method
2011
Mw9.0
Tōhoku Earthquake — Ground Response
📍 東北地方, Northeast Japan
The Great East Japan Earthquake produced unprecedented ground shaking records. Extensive liquefaction affected Chiba and Tokyo bay areas. Seismic site amplification data from this event reshaped Japanese seismic design codes.
Engineering Lessons
Reclaimed land on Tokyo Bay showed severe liquefaction with sand boils
Vs30 accurately predicted amplification zones across affected regions
Deep alluvial deposits amplified long-period ground motion
1963
LANDSLIDE
Vajont Dam Slope Failure
📍 Dolomites, Italy
A 270 million m³ rockslide into the reservoir created a 250m high wave that destroyed the town of Longarone. The failure occurred along ancient clay-filled joints at residual shear strength — much lower than peak values used in design.
Engineering Lessons
Residual shear strength (φ'r) controls reactivated landslides, not peak φ'
Reservoir filling raised pore pressure in slope, triggering failure
Pre-existing failure surfaces must always be investigated with boreholes
1995
M6.9
Kobe Earthquake — Port Island
📍 神戸市, Kobe, Japan
The Hyogo-ken Nanbu earthquake devastated Kobe's port area with widespread liquefaction on reclaimed land. Port Island — specifically designed with hydraulic fill — suffered catastrophic lateral spreading, tilting quay walls into the harbor by up to 3 meters.
Engineering Lessons
Hydraulic fill has very loose structure — N values < 5 are common
Gravity quay walls on liquefiable backfill are extremely vulnerable
Led to Japan's current ground improvement standards for port structures
2011
SLOPE
Japan Rainfall-Induced Landslides
📍 Various, Japan 日本全国
Japan experiences hundreds of rainfall-induced shallow slope failures annually. Heavy rainfall saturates volcanic ash deposits (火山灰質土) reducing apparent cohesion to near-zero, triggering rapid debris flows on slopes as gentle as 20°.
Engineering Lessons
Volcanic soils lose cohesion rapidly when saturated — piezometer monitoring critical
Slope angle alone doesn't predict failure; pore pressure history matters
Early warning systems based on rainfall thresholds save lives
1173
SETTLEMENT
Leaning Tower of Pisa — Differential Settlement
📍 Pisa, Italy
The tower began tilting during construction due to insufficient foundation depth in soft clay. By 1990, it leaned 5.5° and was at risk of collapse. Engineers carefully removed soil from the north side to reduce the tilt from 5.5° to 3.99° — saving the monument.
Engineering Lessons
Soft clay with variable thickness causes differential consolidation settlement
Terzaghi consolidation theory (1925) explains the 800-year tilting process
Soil extraction is a valid remediation technique for existing structures
Engineering Photos
// 現場写真 — Real-world geotechnical engineering in action
// LIQUEFACTION & EARTHQUAKE DAMAGE
Lateral spreading occurs when liquefied soil flows toward a free face — riverbank or slope. Ground cracks open perpendicular to the flow direction, and structures spanning the zone are torn apart.
Engineers use the Youd et al. empirical model to predict lateral spread displacement from M, R, and N₁₍₆₀₎ values.
Sand boils (砂噴出) are the surface expression of liquefaction. Water and sand erupt from cracks as excess pore pressure dissipates upward. They confirm that σ'→0 occurred at depth during shaking.
The presence of sand boils post-earthquake immediately flags an area for FL assessment and ground improvement before reconstruction.
// BOREHOLE & FIELD INVESTIGATION
The Standard Penetration Test (SPT) remains Japan's most common ground investigation method. A 63.5kg hammer drops 760mm to drive a split-spoon sampler 300mm. The N-value (blow count) characterizes soil density and strength.
Japan's design codes directly use N-value for liquefaction screening, bearing capacity of spread footings, and pile tip resistance estimation.
Thin-walled Shelby tube samples (Osterberg sampler) preserve clay fabric for consolidation and strength tests. Sample quality is assessed by void ratio change and stress history inspection before testing.
Sample disturbance is the #1 source of error in soft clay strength testing — proper handling, wax sealing, and cold storage are essential from field to lab.
// SEISMIC SURVEYS & GEOPHYSICS
MASW (Multichannel Analysis of Surface Waves) deploys geophones in a linear array to measure Rayleigh wave dispersion. Inversion yields a continuous Vs profile to 30m depth without drilling.
MASW is especially valuable in Japan for rapid Vs30 mapping of large construction sites before borehole locations are decided, reducing total investigation cost.
Rock Quality Designation (RQD) is measured directly from drill core: sum of pieces ≥100mm divided by total core run length × 100%. It's the fastest field indicator of rock mass quality for foundation and tunnel design.
RQD 90–100% = Excellent rock. Below 25% = Very Poor. Japanese tunneling practice uses RQD to select support pattern and face advance distance.
// FOUNDATIONS & CONSTRUCTION
Bored cast-in-place piles are the dominant deep foundation type in Japanese urban construction. They pass through soft alluvial layers to reach bearing strata, transferring structural loads through both tip resistance and shaft friction.
Japanese Building Standard Law requires proof loading or integrity testing of at least 1% of piles per project. Ps-logging and cross-hole sonic are standard QA methods.
Deep Soil Mixing (DSM) injects cement slurry while mechanically mixing soil in-situ, creating stiff columns that improve bearing capacity, reduce settlement, and prevent liquefaction by increasing confining stress.
DSM is Japan's most used ground improvement method for reclaimed land. Target unconfined compressive strength qu ≥ 1 MPa is typically specified for liquefaction mitigation.
Activate Premium
// Unlock all advanced engineering features
Upgrade to GeoLearn Premium
Enter your license key to unlock the full GeoLearn Japan platform — virtual labs, advanced calculators, career roadmaps, and complete engineering simulations.
Virtual Geotechnical Lab
Simulate SPT, CPT, and pressuremeter tests in real-time with field data visualisation.
Advanced Calculators
Full suite of soil analysis, bearing capacity, Vs30, and liquefaction assessment tools.
Full Quiz Library
All exam questions for 地質調査技士, 物理探査技士, 技術士補, and 技術士.
Smart Study Tools
AI Tutor, Professor Mode, Smart Study Panel, Daily Focus, and Pomodoro system.
Career Roadmaps
Full certification roadmaps, study plans, and progress analytics for all 4 licenses.
Field Simulations
Liquefaction, slope, and wave simulations plus knowledge maps and case studies.
Enter Your License Key
Your key was provided when you purchased GeoLearn Premium. Format: XXXXX-XXXXX-XXXXX.
🔑 License Key Recovery
Enter the email address used when purchasing GeoLearn Premium. We'll open your email client with a pre-filled recovery request to send to our support team.
Admin Access
⚙ Developer / Admin Login
Enter the master password to enable Admin Mode. Admin mode lets you preview the app as a Free or Premium user without changing your actual activation status.
⚙ Admin Password Recovery
Fill in the form below and your request will be sent directly to the lead developer.
Or email directly: myonaingtun404@gmail.com
⚙ Admin Mode Active
You are in Admin Mode. Use the floating control bar at the bottom of the screen to preview the app as a Free User or Premium User. Your actual localStorage activation is not affected.
🔑 License Key Generator
Generate valid premium license keys to distribute to users.