Question

A \(30\) cm diameter friction pile is embedded \(10\) m into a homogeneous consolidated clay deposit. Unit skin friction developed between clay and pile shaft is \(7\) t/m\(^2\) and adhesion factor is \(0.7\). Assuming end bearing is zero, the safe load for factor of safety \(3\) will be

• A. \(7.7\) t
• B. \(15.4\) t
• C. \(22\) t
• D. \(11\) t

Hint:

For friction piles, \[ Q_u=\alpha c(\pi DL) \] and \[ Q_{safe}=\frac{Q_u}{FOS}. \] Always verify whether the examination uses unit skin friction directly or as undrained cohesion while solving pile capacity problems.

Answer 1

The Correct Option is C