The problem of the stability of a rock slope containing a three-dimensional wedge resting on two intersecting discontinuities is analyzed by means of engineering graphics, using spherical projections and analytically. The effects of an obliquely inclined upper slope surface, a tension crack behind the slope face, water within the tension crack and on the sliding surfaces and an external force, due for example to a cable anchor, are included in the analysis. Resistance to sliding results from both friction and cohesion on the sliding surfaces.

A worked example, using all three methods, is given.

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