In a sand drain system for accelerating consolidation, the diameter of the sand drain affects:
Choose the correct answer
Only vertical consolidation
Radial (horizontal) drainage rate — larger diameter means shorter drainage path and faster consolidation
The consolidation coefficient C_v only
The liquid limit of the soil
Correct Answer
B. Radial (horizontal) drainage rate — larger diameter means shorter drainage path and faster consolidation
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Sand drains (or prefabricated vertical drains/PVDs) accelerate consolidation by providing short radial drainage paths to the drain. The effective drainage radius depends on drain spacing. Larger drain diameter and closer spacing reduce radial drainage paths.
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