A flexible foundation, $10m15m,$ is to be constructed at a depth of $2m$ in a

deposit of $5m$ granular material resting on a $4m$ thick clay layer which in turn

rests on a dense granular layer. The foundation exerts a gross uniform

pressure of $250$kPa. The water table is $3m$ below ground level. The saturated

unit weights of the granular soil and the clay are $18k\frac{N}{m^3}$ and $20k\frac{N}{m^3}$

respectively.

Laboratory testing on samples of the clay yielded the following: $E_u=20M\frac{N}{m^2}$

and $m_v=7{10}^{-2}\frac{m^2}{M}N.$

Calculate the total settlement of the foundation at its plan centre due to both the

elastic and the consolidation settlement of the clay layer.

You can assume that the clay layer undergoes $1-$D consolidation and that the

granular material above the water table remains saturated.

Steinbrenner's and Fadum's Charts apply.