🔍 Geotechnical Site Investigation - Complete Guide

30 Why Site Investigation Is the Foundation of Every Geotechnical Project 31 Regulatory Landscape: ASTM, BS, ISO, and Local Authority Requirements 32 Borehole Drilling Methods: Auger, Wash, Rotary — Selection Criteria 33 Standard Penetration Test (SPT): Execution, Correction, and Common Errors 34 Cone Penetration Test (CPT) Interpretation: qc, fs, and u₂ Profiling 35 Grain Size Analysis: Sieve vs. Hydrometer — When to Use Which 36 Atterberg Limits Lab Protocol and Field Correlations 37 USCS Dual Symbol Classification Logic Tree Walkthrough 38 Triaxial Test Types: CU, CD, UU — Selecting the Right Test for Your Problem 39 Consolidation Test Curve Fitting: Casagrande and Taylor Methods 40 Density Testing Comparison: Sand Cone, Rubber Balloon, Nuclear Gauge 41 Measuring and Interpreting Piezometric Levels in Multi-Aquifer Systems 42 Effective Stress Principle in Partially Saturated Soils 43 Rock Quality Designation (RQD) Field Measurement and Pitfalls 44 RMR vs. Q-System: When to Apply Each and How to Cross-Check 45 Seismic Refraction for Bedrock Depth — Field Setup and Velocity Inversion 46 Electrical Resistivity Imaging (ERI) for Clay Lens Detection 47 Lab-Field Data Discrepancy Diagnosis: Sample Disturbance and Moisture Hysteresis 48 Quantifying Uncertainty in SPT-Based Parameter Estimation 49 SPT-Based Liquefaction Screening: Idriss & Boulanger Methodology 50 CRR Curves and Magnitude Scaling: From Field Data to Design CSR 51 Writing Actionable Geotechnical Recommendations — Not Just Observations 52 Visualizing Subsurface Data: Borehole Logs, Cross-Sections, and 3D Models 53 Ethical Responsibilities in Geotechnical Reporting and Peer Review 54 QA/QC Protocols for Field and Lab Work — ISO 17025 Alignment