Question

A group of 16 piles of $10\text{m}$ length and $0.5\text{m}$ diameter is installed in a $10\text{m}$ thick stiff clay layer underlain by rock. The pile-soil adhesion factor is 0.4; average shear strength of soil on the sides is $100\text{kPa}$; undrained shear strength of the soil at the base is also $100\text{kPa}$

The base resistance of a single pile is

• A. $40.00\text{kN}$
• B. $88.35\text{kN}$
• C. $100.00\text{kN}$
• D. $176.71\text{kN}$

Answer 1

The correct option is D $176.71\text{kN}$


Base resistance of single pile
$=q_b\times A_b$
$=C{N}_c\times \frac{\pi d^2}{4}$
$=100\times 9\times \pi \times \frac{(0.5{)}^2}{4}$
$=176.7\text{kN}$