Worked examples

The worked examples in this chapter involve verification of strength of an infinite soil slope overlying permeable rock (Example 9.1); an infinite soil slope overlying impermeable rock (Example 9.2); a road cutting designed using charts and slope stability software (Examples 9.3 and 9.4); and a road embankment over an alluvial flood plain (Example 9.5).

Specific parts of the calculations are marked O, ©, ©, etc., where the numbers refer to the notes that accompany each example.

9.8.1 Infinite soil slope overlying permeable rock

Example 9.1 considers an infinite soil slope overlying permeable rock, with no groundwater in the slope owing to vertical seepage into the underlying rock, as shown in Figure 9.9.

Figure 9.9. Infinite soil slope overlying permeable rock

This example highlights the effects of applying partial factors to material properties and the ambiguities that arise when partial factors are applied to actions. In particular, there are difficulties where an action can have both favourable and unfavourable effects. For slope stability problems, this is a

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