Calculator D2

Standard Penetration Test (SPT) Procedure and Limitations

📘 Definition

Standard penetration testing, soil classification, lab/field data interpretation, and reporting frameworks for subsurface characterization.

🎨 Concept Diagram

SPT RodHammer (63.5 kg)Free fall (76 cm)Interpretation• Soil classification• N-value correction• Lab/field correlation• Reporting (ASTM D1586)SPT ProcedureInterpretation & LimitsLimitations: • Sandy silt sensitivity• Disturbed samples

AI-generated illustration for visual understanding

⚠️ Common Mistakes

📖 Detailed Explanation

Content for: Standard Penetration Test (SPT) Procedure and Limitations. Standard penetration testing, soil classification, lab/field data interpretation, and reporting frameworks for subsurface characterization.

📋 Real Project Case

Urban Transit Tunnel Alignment Through Mixed-Soil Stratigraphy

3.2 km cut-and-cover metro extension in Jakarta, Indonesia

Challenge: Variable soil profile (soft clay → weathered volcanic tuff → dense sand) causing differential settle...
Dense Sand (φ′=36.4°, K₀=0.41)Weathered Volcanic TuffSoft Clay (Cv=0.82 m²/yr)InclinometerSecant PilesJet-grouted secant piles (staged excavation)Differential settlement & excavation instabilitySoil Stratigraphy Survey:SPT + CPT + Seismic RefractionDesign Parameters:φ′ = 36.4° | K₀ = 0.41 | Cv = 0.82 m²/yr
Read full case study →