Using Fellenius method of slices determine the factor of safety in terms of effective stress for the circle cut in the slope as shown in Figure 3(Q5). The properties of

the sandy soil are as follows: Ys = 20 kN/m3 and o = 30°. Divide the slope cut into at leas tfour slices. Show your values for the heights of the slices and for a, the inclination of the base to the horizontal both graphically and in a table with the additional information that you need to make the calculation for the factor of safety. Show F_{S}=\frac{\sum\left[(w \cos \alpha-U) \tan \phi_{c i t}^{\prime}\right]}{\sum(w \sin \alpha)}