Q$9.$ The pile group loaded with $2500$ kN is as shown in Figure. The length and width of the pile group is $3\mathrm{.}3$ m and $2\mathrm{.}2$ m respectively. Determine the consolidation settlement of pile group if both clays are normally consolidated. Use $2$:$1$ method to estimate the average effective stress in the clay layers due to the external load. $(12$M$)$

Clay

$e_o=0\mathrm{.}75,C_c=0\mathrm{.}25$

${}_{\text{s}\text{a}\text{t}}=19\mathrm{.}0k\frac{N}{m^3}$

$z=24mobrace($ Rock $)$