Example

Figure 5.26 gives details of the cross-section of an embankment. The soil has the following properties: cj>' = 35°, c' = 10kN/m2, 7 = 16kN/m3.

For the slip circle shown, determine the factor of safety for the following values of ru: 0.2, 0.4 and 0.6. Plot the variation of F with ru.

Solution

The calculations were based on the rigorous method and are shown in Fig. 5.27.

| slice

z(m)

J b(m)

0 0

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