For a cohesionless soil with a friction angle of 30 degrees, Rankine's active earth pressure coefficient is approximately:
Correct answer: B. 0.33
- A. 0.25
- B. 0.33
- C. 0.50
- D. 1.00
Explanation
Rankine's active coefficient is Ka = (1 − sin φ)/(1 + sin φ). For φ = 30 degrees, Ka = 0.5/1.5, which is approximately 0.33.
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About Soil Mechanics and Foundations
Soil mechanics examines index properties, phase relationships, classification, permeability, seepage, compaction, consolidation, shear strength and earth pressure. Foundations apply these principles to bearing capacity, settlement and shallow or deep foundation selection, with clear distinction between compaction, which expels air, and consolidation, which expels water over time.
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