Figure shows a $5\mathrm{.}0-$m$-$high retaining wall $($back filled with OC sand$).$ Water table is at

$3\mathrm{.}5$m$.$ Calculate the lateral force Po per unit length of the wall. Also, determine the location

of the resultant force.

OCR$=1\mathrm{.}4$

$3\mathrm{.}5$m c$\text{'}=0$ f$\text{'}=35$ unit weight $=$ kN$/$m$3$

$1\mathrm{.}5$m c$\text{'}=0$ f$\text{'}=35,$ Unit weight sat $=$ kN$/$m$3$

sand

Saturated

sand