Abstract
The classification of rock slope is based on the mode of failure. In many cases, the slope failures in rock masses are governed by joints and occur across surfaces formed by one or several joints. Some common modes of failures are briefly described in this chapter, such as 3D wedge failure and circular failure. Wedge failure occurs along two joints of different sets when these two discontinuities strike obliquely across the slope face and their line of intersection daylights in the slope face. The wedge failure depends on joint's attitude and conditions and is more frequent than planar failure. The safety factor of a rock wedge to slide, increases significantly with the decreasing wedge angle for any given dip of the intersection of its two joint planes. Whereas, circular failure occurs along a surface, which only partially develops along joints, but mainly crosses them. These failures can only happen in heavily jointed rock masses with a very small block size and/or very weak or heavily weathered rock.
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