For a pile group driven into soft clay, block failure occurs when the group acts as:
Correct answer: C. A single enlarged pile shaft
- A. A flexible raft above the ground
- B. Separate piles with no interaction
- C. A single enlarged pile shaft
- D. A frictionless column in the soil
Explanation
In block failure, the piles and the enclosed soil move together as one composite block. Treating the group as separate non-interacting piles can overestimate the capacity when the surrounding clay is soft.
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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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