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<br /> <br />i <br /> <br />1 <br /> <br />1 <br /> <br /> <br /> <br /> <br /> <br />t <br /> <br />1 <br /> <br />1 <br />involves a circular, or rotational, type of failure. For the <br />purpose of this analysis, all bench soil slopes were assumed to <br />have a circular failure mechanism. <br />For rock slopes of low to moderate height, it is common to find <br />that stability is controlled by structural discontinuities or <br />existing planes of weakness in the rock rather than by intact <br />strength of the rock itself. For this reason, detailed <br />information on the number, spacing and attitude of all existing <br />planes of weakness (bedding planes, joints, fractures, etc.) <br />became extremely important. For the rock cut slope analysis, we <br />looked at the potential for the development of four different <br />failure mechanisms in the rock slopes: <br />• Circular Failures: This failure involves a rotational- <br />type of failure which assumes that the rock will fail <br />based on its overall strength characteristics rather than <br />being dictated by joints, bedding planes, etc. <br />• Plane gailures: These failures involves the movement of <br />a block of rock material on a single weak plane and is a <br />problem which can be analyzed in two dimensions. <br />• Wedae Failures: This type of failure involves the <br />movement of a wedge of rock formed by two or more planes <br />of intersecting discontinuities. This type of problem <br />can be handled in two dimensions, but requires three <br />dimensional modelling. <br />9 <br />