During standard mechanical compaction of a partially saturated soil, the main material expelled from the voids is:
Correct answer: B. Pore air
- A. Soil minerals
- B. Pore air
- C. Pore water
- D. Organic matter
Explanation
Compaction rapidly densifies soil mainly by expelling air from its voids through mechanical energy. Consolidation is the slower process in which water is expelled from saturated soil under sustained loading.
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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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