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' clusters were found in the expansion area, with only a weak fingerprint for the F-3 <br />' discontinuity set differentiating the two (Figure 10). <br />The emergence of F-2 and F-3 as definitive discontinuity sets has only been identified <br />over the past several years as a result of the 2003 geotechnical investigation and the <br />' subsequent year's investigations. The intersection of the foliation planes (F-1, F-2 and F- <br />3) with each other will not be evaluated in the wedge stability analyses presented herein. <br />Overall the discontinuity sets obtained by analysis of the entire dataset 3066 Y Y (i.e., points) <br />' are consistent with the cluster analysis from previous years' individual analyses (Figure 8). <br />Both of the foliation discontinuity orientations, F-2 and F-3 are identifiable within the <br />quarry, but have not been recorded in large enough quantities to create a strong signature <br />in the analysis of the entire dataset. However, based on the prevalence of these <br />discontinuities in the southern expansion area, both of these orientations have also been <br />continued to be used in this analysis. <br />1 <br />To adequately understand the impacts of the new data on wall stability, the final planes <br />representing each discontinuity set within the total dataset and the plane representing the <br />orientation of the respective quarry wall slope face were plotted. The stereographic <br />' analysis of each quarry wall is presented in Figures 11 - 16. <br />5.2 Wedge Stability Analysis <br />As presented in previous annual reports, the method of stereographic analysis developed <br />by Markland (1972) was used for this study. Markland's test is designed to identify the <br />' possibility of a wedge failure in which sliding takes place along the line of intersection of <br />two discontinuities (Hoek & Bray, 1977). <br />According to Markland's test, sliding can occur when: <br />1) The plunge of the lines of intersection is less than the dip of the slope face. <br />2) The plunge of the lines of intersection exceeds the angle of friction. <br />-13- <br />Lachel & Associates <br />AA SCHNABGI F.NGINF.FRING CGNFANY