Question

A pile of dia $0.4\text{m}$ fully embedded in a clay strata having 5 layers; each $5\text{m}$ thick as shown in fig. Assuming a constant unit weight of soil $18{\text{kN/m}}^3$ for all the layers using $\lambda$- method ($\lambda =0.15$ for $25\text{m}$ embedment length) and neglecting the end bearing components the ultimate beam capacity (in kN) is

• A. 1625.77

Answer 1

The correct option is A 1625.77
Ultimate bearing capacity

$=\lambda ({\sigma }_{v.av.}+2C_u)A_s$

$Avg,C_u=60{\text{kN/m}}^2$

${\sigma }_{\text{avg}}=225{\text{kN/m}}^2$

Ultimate bearing capacity

$=(60\times 2+225)\times 0.15\times \pi \times 0.4\times 25$

$=1625.77\text{kN}$