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1 <br />t bench soil slopes was based on stability charts published in Rock <br />Slone Fi,9ineerina by Hoek and Bray, 1974. <br />~ , <br />' The analysis of the various non-circular failure modes associated <br />with the rock cut slopes on-site were performed on equal area <br />' stereonets using basic analytical procedures outlined in Hoek and <br />Bray, 1974. <br />1 <br />' S.5 RESULTS ,Q~ ANAi.Vy~ <br />It is generally accepted as state-of-the-art in soil engineering <br />' today that a factor of safety on the order of 1.5 is considered <br />acceptable for the long-term stability design of cut and fill <br />' slopes. Therefore, the portal cut stability analysis was based <br />' on the final slopes having a safety factor greater than 1.5 to be <br />acceptable. The detailed results of the analysis performed on <br />t the circular-type of failure mode for the rock cut are shown on <br />Figure 12 and summarized on Table 2. The results of the non- <br />, circular failure modes for the rock cut are summarized on Table <br />' 3. The results of the bench circular failure analysis can be <br />found on Table 2 of this report. All of this information, <br />however, may be summarized as follows: <br />' • Circular ock Failure- <br />' pooposed portal cuts are <br />A typical cross-section <br />' for each alternative is <br />indicates that Case A <br />The various alternatives for the <br />shown on Figures 13 through 16, <br />through the proposed portal cut <br />shown on Figure 17. This figures <br />will involve the steepest and <br />1 <br /> 12 <br />' <br />