If the unit skin friction is f av, length L and diameter of circular pile is D, then the expression for frictional resistance exerted by the soil on the pile is
- Afₐᵥ × L × π × DCorrect
- Bfₐᵥ × L × D
- Cfₐᵥ × π × D 2 /4
- DNone of these
Solution
Concept
Frictional resistance
Formula
Qf = fₐᵥ × π D × L
Step-by-step solution
1. Surface area = πDL. 2. Qf = fₐᵥ πDL.
Explanation
Friction × area.
Why the other options are wrong
Other expressions lack π or use wrong area.
Shortcut
Qf = f × πDL.
Correct answer: A) fₐᵥ × L × π × D