Under-reamed piles are particularly suitable for foundations on:
Correct answer: D. Expansive clay subject to seasonal movement
- A. Loose clean sand above the water table
- B. Uniform gravel with negligible volume change
- C. Hard rock with no weathered zone
- D. Expansive clay subject to seasonal movement
Explanation
Under-reamed piles have enlarged bulbs that are placed below the active zone of expansive soil, reducing the effects of seasonal swelling and shrinkage. They are not selected specifically because of the absence of volume change in sands, gravels or hard rock.
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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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