For a normally consolidated clay layer, the primary consolidation settlement can be calculated using:
Correct answer: C. H Cc/(1 + e0) log10((σ0' + Δσ')/σ0')
- A. H Cc/(1 + e0) log10(σ0'/σ0')
- B. H Cs/(1 + e0) log10((σ0' + Δσ')/σ0')
- C. H Cc/(1 + e0) log10((σ0' + Δσ')/σ0')
- D. H Cc(1 + e0) log10((σ0' + Δσ')/σ0')
Explanation
For normally consolidated clay, the virgin compression index Cc is used and the stress ratio is the final effective stress divided by the initial effective stress. The other expressions either omit the stress increase or use the wrong compression parameter or factor.
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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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