During primary consolidation of saturated clay, settlement occurs mainly because of:
Correct answer: C. Expulsion of water from soil voids
- A. Expulsion of air from soil voids
- B. Breakage of soil particles
- C. Expulsion of water from soil voids
- D. Thermal expansion of pore water
Explanation
Primary consolidation involves the gradual dissipation of excess pore-water pressure and the associated expulsion of water from the voids. Expulsion of air is the principal mechanism in ordinary mechanical compaction of partially saturated soil.
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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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