$F=\frac{c^{\text{'}}{L}_a+tan{}^{\text{'}}{\displaystyle \underset{i}{\overset{?}{}}}(W_{i}cos{}_i-u_i{l}_i)}{{\displaystyle \underset{i}{\overset{?}{}}}{W}_{i}sin{}_i}$

For the given failure surface as shonw in Figure Q$-2,$ determone whether the slope is stable

based on Fellenius Method of Slice $($expression of Factor of Safety, pre$-$EC$7$ is given above$).$

The characteristic unit weight of the soils is taken as $21k\frac{N}{m^3},$ and the characteristic shear

strength parameters are $c^{\text{'}}=8$kPa, and ${}^{\text{'}}=32.$

Design according to EC$7.$

Hint$-$a$.$ You can assumed $7-8$ vertical slices of $4m$ width each.

b$.$ You may also want to setup a TABLE with columns of various terms in the given

expression to aid in the computation. The examples of the table is as follow: