Consider the wall in an active state below. Determine the factor of satety against overturning at the toe of the wall. The wall is $2\mathrm{.}5$ m thick. $y=m==250Nm$

Question $4[20$ Marks$]$

A $9$ m thick clay layer with water table at the surface, drains only at the top and is subjected to a $120$ kPa distributed load.

$c_v=7\frac{m^2}{?}$ year, $m_v=0\mathrm{.}8MP{a}^{-1},y_{\text{b}\text{o}\text{u}\text{k}}=16\mathrm{.}5k\frac{N}{m^3}$ and $,Y_{\text{s}\text{a}\text{t}}=19k\frac{N}{m^3}$

$4\mathrm{.}1$ Calculate the excess pore pressure at depths $3m,6m$ and $9$ m after $2$ years. $(9)$

$4\mathrm{.}2$ Calculate the consolidation settlement $($in mm $)$ after $2$ years.

$(6)$

$4\mathrm{.}3$ Determine the total pore pressure $($u$)$ for each depth at $4\mathrm{.}1.$

$(5)$