Example $9\mathrm{.}1$: Fig. $9.27$ shows the details of an em$-$

bankment made of cohesive soil with $=0$ and $c=30$

$k\frac{N}{m^2}.$ The unit weight of the soil is $18\mathrm{.}9k\frac{N}{m^3}.$ De$-$

termine the factor of safety against sliding along the

trial circle shown. The weight of the sliding mass is

$360$ kN acting at an eccentricity of $5\mathrm{.}0$ m from the

centre of rotation. Assume that no tension crack de$-$

velops. The central angle is $70.$

Fig. $9\mathrm{.}27$ Trial slip circle $($Ex$.9\mathrm{.}1)$