GATE CE 2024 Set 2 — Question 23
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Geotechnical Engineering → Consolidation → NC & OC Clays
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Question
Which one of the following saturated fine-grained soils can attain a negative Skempton’s pore pressure coefficient ()?
Correct answer
(D) Over-consolidated clays
Solution
Skempton's pore pressure coefficient is related to the volume change tendency of soil during shear. Over-consolidated clays (with a high OCR) tend to dilate (increase in volume) when subjected to shear stress. In undrained conditions, this tendency to dilate results in a decrease in pore water pressure (negative pore pressure), which leads to a negative value for the coefficient .
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