A deep pile foundation is generally preferred over a shallow foundation when:
Correct answer: B. The upper soil is weak and a deeper bearing layer is available
- A. A strong bearing layer lies near ground level
- B. The upper soil is weak and a deeper bearing layer is available
- C. The applied load is negligible
- D. The groundwater table is absent
Explanation
Piles are useful when weak or highly compressible near-surface soil cannot safely support the structure. They transfer load through end bearing, skin friction, or both to deeper soil or 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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