GATE CE 2022 Set 1 — Question 55
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Geotechnical Engineering → Consolidation → Time Rate of Consolidation
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Question
A raft foundation of is proposed to be constructed at a depth of in a sand layer. A thick saturated clay layer exists below the base of the raft foundation. Below the clay layer, a dense sand layer exists at the site. A thick undisturbed sample was collected from the mid-depth of the clay layer and tested in a laboratory oedometer under double drainage condition. It was found that the soil sample had undergone consolidation settlement in .The time (in days) required for consolidation settlement of the raft foundation will be ____________________. (round off to the nearest integer)
Correct answer
1730 to 1740
Solution
Given:
For , .
Since is constant for the same soil:
Converting to days:
Rounding to the nearest integer, we get 1736 days.
- Lab sample thickness , double drainage .
- Lab time for .
- Field clay layer thickness . Since there is sand above (2 m layer) and dense sand below, it is a double drainage condition .
- We need field time for .
For , .
Since is constant for the same soil:
Converting to days:
Rounding to the nearest integer, we get 1736 days.
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