Negative skin friction (NSF) on a pile occurs when:
Choose the correct answer
The pile settles more than the surrounding soil
The surrounding soil settles more than the pile
The pile is loaded in tension
The pile is too short
Correct Answer
B. The surrounding soil settles more than the pile
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NSF (drag) occurs when the surrounding soil settles more than the pile (e.g., due to consolidation of a clay layer through which the pile passes). This downward movement of soil relative to pile generates a downward frictional force (drag) on the pile.
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