UPSC Civil Service Exam Questions - Civil Engineering Questions and Answers

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A clay layer 3 m deep is sandwiched by a pervious material. The soil reaches 90% consolidation in 3 years. At another site, the same clay layer is bounded by impervious boundary at the bottom and sand at the top. What is the time taken by this layer to reach 90% settlement ?

9 years

12 years

15 years

21 years

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