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California Bearing Ratio (CBR) Testing for Subgrade Evaluation

📘 Definition

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

🎨 Concept Diagram

Lab TestingField DataReportingSoil ClassificationCBR InterpretationStandard Penetration & Subgrade Evaluation

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⚠️ Common Mistakes

📖 Detailed Explanation

Content for: California Bearing Ratio (CBR) Testing for Subgrade Evaluation. 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
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