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Degree of Consolidation

The identical...

Question

The identical clay samples of the same size, designated as A and B are subjected to consolidation test under identical loading conditions. Drainage takes place through one face in sample A and through both the faces in sample B. 50% consolidation of sample A occurs in 10 minutes. The time required for 50% consolidation to occur in sample B will be

A

40 minutes

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B

10 minutes

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C

5 minutes

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D

2.5 minutes

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Solution

The correct option is D 2.5 minutes
The sample A is single drained and sample B is double drained. The sample B will take only $\frac{1}{4}$ of time that required is sample A.

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