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Degree of Consolidation

A clay layer ...

Question

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?

A

9 years

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B

12 years

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C

15 years

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D

21 years

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Solution

The correct option is B 12 years
For same degree of consolidation,

$t_{2} = t_{1} {(\frac{d_{2}}{d_{1}})}^{2}$

$= 4 t_{1} = 4 \times 3 = 12 y e a r s$

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