Q$3.$ An oedometer tests on a saturated clay specimen were conducted and the following

values were determined: Preconsolidation pressure $({}^{\text{'}}p)=325$kPa,$Cc=0\mathrm{.}3,$ and $Cs=0\mathrm{.}1,$

initial void ratio $e_0=0\mathrm{.}65,$ unit weight $=18\mathrm{.}7K\frac{N}{m^3}.$ The initial thickness of the

specimen was $19\mathrm{.}0mm.$

Determine the primary consolidation settlement if the applied load on the footing shown in

Figure $3=632kN.$ Find the time when $50\%$ of consolidation occurred $($Assume the

sample's $t50=20$min.$).$