Problem $5$:

A square column foundation $1\mathrm{.}5m1\mathrm{.}5m$ is shown in the Figure. It carries an axial load of $446$ kN and has its bottom resting on the ground water table located $1\mathrm{.}4$ m below the ground surface.

a$.$ Compute the average increase in pressure in the clay layer below the center of the foundation using $2$:$1$ Method.

b$.$ Compute the effective pressure at the mid$-$height of the clay layer.

c$.$ Compute the settlement of the clay layer caused by primary consolidation if the preconsolidation pressure of the clay is $96$ kPa $.$