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December 1986 13 863-2060 <br />• <br />5.0 STABILITY ANALYSES <br />5.1 Method of Analysis <br />Slope stability analyses were performed on a representative sec- <br />tion through Area 9/10 using the Golder Associates stability <br />analysis computer program CSLOPE. This program uses limiting <br />equilibrium methods of slices for analysis of circular or non- <br />circular failure surfaces. It includes automatic search options <br />for locating the critical failure surfaces for both circular and <br />non-circular surfaces. <br />The simplified Bishop method is available for analysis of cir- <br />cular failure surfaces with CSLOPE. This is a widely used <br />analysis method which provides a reliable and efficient measure <br />• of slope stability. Although the method does not satisfy all <br />conditions of equilibrium, it has been found to produce highly <br />accurate results over a wide range of conditions. <br />Sarma's method is used by CSLOPE for all non-circular failure <br />surfaces and can also be used for circular surfaces. The Sarma <br />method satisfies all conditions of equilibrium, and so is in- <br />cluded in the category of "accurate" methods of slices, along <br />with methods such as Morgenstern-Price and Spencer. Sarma's <br />method has the advantage of being more efficient and stable <br />numerically than some other accurate methods. Since all condi- <br />tions of equilibrium are satisfied, the safety factors calculated <br />using Sarma can he considered to be equally correct to those <br />calculated by other "accurate" methods, with minimal margin for <br />error in the analysis. <br />J <br />Golder Associates <br />