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A double draining clay layer, 6 m thick, settles by 30 mm in three years under the influence of a certain loads. Its final consolidation settlement has been estimated to be 120 mm. If a thin layer of sand having negligible thickness is introduced at a depth of 1.5 m below the top surface, the final consolidation settlement of clay layer will be
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- 60 mm
- 120 mm
- 240 mm
- None of these
Correct Option: B
Rate of settlement will not affect final settlement.
Rate of settlement of clay will increase 4 times
But total settlement will be unaffected.
∴ final settlement = 120 mm
