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STABILITY OF DEVELOPMENT ROCK PILE <br />The stability of the development rock pile was analyzed under <br />several loading conditions to determine its factor of safety against a <br />mass rotational failure of the base materials and shallow surface <br />failures in the development rock. These studies indicate that a 1.5:1 <br />slope on the development rock pile is stable under all loading <br />conditions which can be anticipated at the site. <br />In order to assess the stability of the development rock pile, <br />three general conditions were investigated for two exterior slope <br />angles on the development rock pile. The cases investigated were: <br />A cohesive foundation soil for the development rods pile, <br />A granular foundation soil for the development rock pile, <br />A shallow slope failure in the development <br />infinite slope analogy. <br />Each of the basic physical conditions was investigated under <br />static loading conditions and three pseudostatic earthquake <br />coefficient loadings. The slope stability analyses were conducted <br />a computer program which performs the simplified Bishop method of <br />analysis. The configuration of the slopes analyzed, the strength <br />parameters and the various data input into the stability analysis are <br />shown in detail on Figs. 23 and 24 for exterior slope angles of 1.5:1 <br />. 2:1, respectively. A summary of the stability analyses is <br />?resented on Fig. 22. Subsequent to the computer analyses, the <br />critical loading conditions were Checked by hand utilizing the <br />c.nplified Bishop method. <br />(1) <br />(2) <br />(3) <br />-42- <br />rock pile based on <br />the <br />by <br />