GATE CE 2015 Set 2 — Question 48
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Geotechnical Engineering → Consolidation → Consolidation Settlement
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Question
A thick layer of normally consolidated clay has an average void ratio of 1.30. Its compression index is 0.6 and coefficient of consolidation is . If the increase in vertical pressure due to foundation load on the clay layer is equal to the existing effective overburden pressure, the change in the thickness of the clay layer is _______________ mm
Correct answer
313 to 316
Solution
Given:
Initial thickness of clay layer,
Initial void ratio,
Compression index,
Increase in pressure, (where is the existing effective overburden pressure)The formula for primary consolidation settlement (change in thickness) is:Substituting the given values:The change in thickness is approximately 314.12 mm.
Initial thickness of clay layer,
Initial void ratio,
Compression index,
Increase in pressure, (where is the existing effective overburden pressure)The formula for primary consolidation settlement (change in thickness) is:Substituting the given values:The change in thickness is approximately 314.12 mm.
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