Negative skin friction on a pile develops when:
Correct answer: A. The surrounding soil settles relative to the pile
- A. The surrounding soil settles relative to the pile
- B. The pile settles faster than the surrounding soil
- C. The pile tip reaches the water table
- D. The pile is installed in dense sand
Explanation
When surrounding compressible soil settles relative to a pile, interface shear acts downward along the pile shaft. This drag adds load to the pile and is called negative skin friction.
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About Soil Mechanics and Foundations
Soil mechanics examines index properties, phase relationships, classification, permeability, seepage, compaction, consolidation, shear strength and earth pressure. Foundations apply these principles to bearing capacity, settlement and shallow or deep foundation selection, with clear distinction between compaction, which expels air, and consolidation, which expels water over time.
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