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<br />CHAPTER IV <br />ENGINEERING ANALYSIS <br />' A. GENERAL <br />This chapter contains the results of the analyses performed in accomplishing <br />' Tasks 4, 5, and 6 as described in Section C of Chapter 1. Detailed descriptions <br />of the methods of slope stability analysis, and a comprehensive presentation <br />' of the results of the analyses are contained in Appendix C of this report. <br />' B, STABILITY OF WASTE DUMP <br /> <br />1 <br />~~ <br />r <br /> <br /> <br /> <br /> <br /> <br />1 <br />Static slope stability analyses consisted of computing factors of safety <br />for the conditions of: 1) major mass instability involving the waste dump <br />foundation, using the "sliding wedge" method of analysis, and 2) shallow <br />slope ravelling using the "infinite slope" method of analysis. <br />In both cases the waste dump was also analyzed for earthquake and mine <br />blasting forces by the "pseudo-static" analysis, wherein a horizontal <br />force based on a given percent of gravity force is assumed to be constantly <br />acting in the direction of instability. In some cases, factors of safety <br />were computed for a range of seismic coefficients in order to show the <br />influence of that parameter on the value of the factor of safety. <br />"Sliding wedge" analyses were performed for a variety of cases in which <br />the slope angle, embankment height, and foundation inclination were varied <br />through reasonable limits. The analyses was performed for the "end-of- <br />construction" condition, in which it is assumed that there is not sufficient <br />time for the slow draining clay foundation to dissipate internal pore water <br />pressures. This is the critical condition for analysis, and is also the most <br />conservative approach that can be taken, because in reality the strength <br />of the foundation materials will increase with time due to consolidation. <br />S OCnWICJ Project 0823 IV-1 <br />