Which of the following factor(s) can affect the bearing capacity of soil?
Try it first: pick an option, then read the explanation.
Correct answer: D. All options are correct
Asked in SSC JE 02/03/2017 (Morning)
Detailed Explanation
Bearing capacity is not a fixed property of a soil alone. It depends on both the soil and the footing placed on it.
Why “All options are correct” Is Correct
- Grain size and soil type decide c and φ — coarse, dense soils carry more.
- Shape of footing — strip, square and circular footings have different shape factors (e.g. 1.3cNc for square).
- Size of footing — the width B appears in the ½γBNγ term, so wider footings on sand carry more.
All three affect bearing capacity: option (d).
Why the Other Options Are Wrong
- A. Grain size of the soil: True, but shape and size also matter.
- B. Shape of footing: True, but grain size and size also matter.
- C. Size of footing: True, but grain size and shape also matter.
Key Point
Bearing capacity depends on soil (c, φ, γ, density, water table) and footing (shape, size, depth).
Key Concepts for Students
- Depth of footing increases capacity through the γD_f·N_q term.
- Water table reduces capacity of sands.
- Eccentric and inclined loads reduce bearing capacity.
Practice more: this is question 42 in Shallow and Deep Foundation MCQs – Part 3. Try the whole set and check every answer instantly.