The compression index of a normally consolidated clay is obtained from the slope of the:
Correct answer: D. Void ratio versus logarithm of effective stress curve
- A. Stress versus strain curve
- B. Shear stress versus displacement curve
- C. Water content versus dry density curve
- D. Void ratio versus logarithm of effective stress curve
Explanation
The compression index is the magnitude of the slope of the virgin compression line on a plot of void ratio against logarithm of effective stress. The other curves describe different soil behaviours and do not directly define the compression index.
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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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