A combined footing is commonly provided when:
Correct answer: C. Two columns are sufficiently close together
- A. The soil has no groundwater
- B. A single column carries no load
- C. Two columns are sufficiently close together
- D. The foundation is placed on solid rock only
Explanation
A combined footing supports two or more columns on one slab or base. It is especially useful when columns are close together or when a boundary prevents an individual footing from being centred. The other conditions do not specifically require a combined footing.
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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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