Methods of investigating slope stability

Contemporary methods of investigation are based on (a) assuming a slip surface and a centre about which it rotates, (b) studying the equilibrium of the forces acting on this surface, and (c) repeating the process until the worst slip surface is found as illustrated in Fig. 5.5. The worst slip surface is that surface which yields the lowest factor of safety, F where F is the ratio of the restoring

Fig. 5.4 Typical rotational slip in a cohesive soil.
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