Sand drains are used to

Answer: 2. accelerate the consolidation

Sand drains are used to accelerate the consolidation process in the soil.

Solution

Sand drains are used to accelerate the consolidation process in the soil. Sand drains are made by making vertical boreholes by driving a casing into the ground. These holes are then backfilled with a suitable grade of sand. These sand drains provide multiple drainage paths for the pore water in the radial direction in addition to the vertical drainage. Since the soil permeability is substantially higher in the horizontal direction than in the vertical, the consolidation rate increases dramatically.

Hence, sand drains are used to accelerate the consolidation process of highly compressible soils thereby strengthening the soil and reducing the post-construction settlement.

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