Question

A single pile, 50 cm in diameter and 15 m long is driven in clay having an average un-confined compressive strength of $100kN/m^2$. The ultimate bearing capacity of the pile, neglecting end bearing, if any, and assuming shear mobilization factor of 0.8 around the pile is

• A. 942 kN
• B. 1884 kN
• C. 1177.5 kN
• D. 1334.5 kN

Answer 1

The correct option is A 942 kN

The skin friction resistance,

$f_s=\alpha c_u$

$c_u=100/2=50kN/m^2$

Ultimate bearing capacity $=\alpha c_{u}PL$

$=0.8\times 50\times (\pi \times 0.5)\times 15$
= 942.5 kN