Question

What is the ultimate capacity in $\text{kN}$ of the pile group shown in the figure assuming the group to fail as a single block?

• A. 921.6
• B. 1177.6
• C. 2438.6
• D. 3481.6

Answer 1

The correct option is D 3481.6

Pile group is failing as a single block


size of pile group $1.6\text{m}\times 1.6\text{m}$
Ultimate capacity of pile group = Bearing capacity at base $\times$ base area + frictional resistance $\times$ surface area
$=q_{pu}{A}_b+f_s{A}_s$
$=C{N}_c.A_b+\alpha C_u.A_s$
$=40\times 9\times 1.6\times 1.6+1\times 40\times 4\times 1.6\times 10=3481.6\text{kN}$