According to Darcy's law, the discharge velocity through a saturated soil is directly proportional to the:
Correct answer: D. Hydraulic gradient
- A. Degree of saturation only
- B. Specific gravity of solids
- C. Plasticity index
- D. Hydraulic gradient
Explanation
Darcy's law gives discharge per unit area as q = ki, where k is the coefficient of permeability and i is the hydraulic gradient. The other properties may affect soil behaviour but are not the direct gradient term in Darcy's law.
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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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