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Which one of the following saturated fine-grained soils can attain a negative Skempton’s pore pressure coefficient (A)?

1. Quick clays
2. Normally-consolidated clays
3. Lightly-consolidated clays
4. Over-consolidated clays

Correct answer: Over-consolidated clays

Solution

Over-consolidated clays can exhibit a negative Skempton’s pore pressure coefficient because they have experienced higher pressures in the past, leading to a reduction in pore water pressure during loading, which can result in negative pore pressure responses.

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