A homogeneous silty sand embankment is built on soft clay. The soil
profile is shown in Figure 5.42. A potential critical slip surface is also
shown.
(1) Use the ordinary method of slices to determine the FS on the
assumed failure plane.
(2) Use Bishop’s simplified method of slices to determine the FS on the
assumed failure plane and compare the FS with the one obtained
in (1).
(3) Calculate the average cohesion, friction angle, and unit weight of
the slope and foundation soil.
(4) Use Taylor’s chart to determine the minimum FS of the slope using
the parameters obtained in (3) (Figure 5.42).