For a normally consolidated, cohesionless soil in Rankine's theory, the coefficient of earth pressure at rest is commonly estimated by:
Correct answer: B. 1 minus sin phi
- A. 1 plus sin phi
- B. 1 minus sin phi
- C. tan squared of 45 degrees plus phi over 2
- D. tan squared of 45 degrees minus phi over 2
Explanation
Jaky's expression for normally consolidated soil is K0 = 1 minus sin phi. The tangent-squared expressions correspond to Rankine active and passive coefficients, not the at-rest condition.
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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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