The quicksand condition in a saturated soil occurs when:
Correct answer: A. Effective stress becomes nearly zero
- A. Effective stress becomes nearly zero
- B. Total stress becomes zero
- C. Pore pressure becomes zero
- D. The soil reaches maximum dry density
Explanation
Quicksand occurs when upward seepage reduces the effective stress to nearly zero, so the soil loses its shear strength. Total stress may still exist, and maximum dry density is related to compaction rather than seepage failure.
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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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