A $10\mathrm{.}5m$ deep excavation in clay is to be retained with an $18m$ long sheet pile wall. The excavation will proceed with three levels of horizontal struts at the depths as shown in the following figure. The soil is normally consolidated soft clay and alluvium, and the soil properties are shown.

Following the example of the lecture notes on the braced cut, calculate and draw

pts$.)$

the apparent pressure diagram $($Peck$,1969)$ for points $O$ to $D$ on the right side of

$(4)$ the figure above.

vel

$6v^{\text{'}},u$