ABSTRACT
Chapter 9 discusses the stability of slopes in closely fractured or weathered rock where the shape of the sliding surface is defined by a large-radius circle. The stability of these slopes is analysed using limit equilibrium methods in which the slide mass is divided into a series of slices, and the ratio of the sum of the resisting forces, defined by the cohesion and friction angle of the sliding surface, to the sum of the resisting forces is the factor of safety. Details of the Bishop and Janbu methods of slices stability analysis are described. A series of design charts to find the factor of safety for circular failure are included; the charts incorporate the slope height and angle, friction and cohesion, and water pressure. Three-dimensional analysis is also discussed. Example problems are included.
