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 $100\text{kPa}$

Assuming $100\%$ efficiency, the group side resistance is

• A. $5026.5\text{kN}$
• B. $10000.0\text{kN}$
• C. $10053.1\text{kN}$
• D. $20106.0\text{kN}$

Answer 1

The correct option is C $10053.1\text{kN}$

$Efficiency=100\%$
Assuming this efficiency corresponding to side resistance
Therefore, Group side resistance
= number of pile $\times$ side resistance of single pile
$=16\times (\alpha C_u.\pi DL)$
$=16\times (0.4\times 100\times \pi \times 0.5\times 10)$
$=10053.09$
$=10053.1\text{kN}$