Problem $3(25\%)$ :

The figure below shows a soil profile. The uniformly distributed load on the ground surface is $=1200l\frac{b}{f}{t}^2.$

Given: $H_1=6ft,H_2=10ft,$ and $H_3=12ft.$ Also,

Sand: ${}_{ms}=107l\frac{b}{f}{l}^3,{}_{sen}=112l\frac{b}{f}{t}^3$

Clay: $1=1221\frac{b}{A}{t}^3,LL-50,e=0\mathrm{.}9.$ Note: $C$~~$0\mathrm{.}009(LL-10),C_5$~~$\frac{C}{5}$

Part a $(5\%)$: Calculate the in situ effective stress $((\frac{b}{f}r)$ at the middle of the clay layer.

Part b $(10\%)$: Estimate the primary consolidation settlement $($f$)$ if the clay is normally consolidated. is $2500l\frac{b}{f}{t}^2.$