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' Quarry Wall Slope Face Azimuth Dip (degrees) <br /> E 242 45 <br /> N 164 45 <br /> W 095 45 <br /> S, 357 45 <br /> S2 317 45 <br /> S3 353 45 <br /> S4 003 45 <br /> ' The Likelihood of wedge failures associated with the intersection of the controlling <br /> ' discontinuities and the slope face is also dependent upon the shear strength of the <br /> discontinuities. This value of shear strength is defined by the friction angle of the rock <br /> mass and the surface roughness of the discontinuities. For this analysis, a conservative <br /> value of internal friction, 0= 35 degrees, was chosen along with a surface roughness <br /> angle i= 5 degrees. A total representative angle of friction (0+ i) = 40 degrees was used <br /> in this analysis. <br /> Figure 5 is a plot of the results from analysis of the East Wall of the quarry. For each <br /> ' analysis the stereonet plot consists of seven poles and great circles representing, planes <br /> of discontinuity, the rock mass foliation, and the azimuth of the slope face. For each plot <br /> ' the foliation great circle is highlighted in orange and the slope face great circle is <br /> highlighted in yellow. The pole representing the slope face is shaded and the area <br /> ' representing the friction angle for the discontinuities is hatched. The pole and associated <br /> great circle representing each discontinuity are labeled for convenience. <br /> There are several methods available for identifying planes which represent potential failure <br /> ' surfaces and those that do not, based on the data plotted in Figure 5. For this analysis the <br /> method developed by Marklund (1972)was chosen. Marklund's test is designed to identify <br /> the possibility of a wedge failure in which sliding takes place along the line of intersection <br /> of two planar discontinuities (Hoek & Bray, 1981). The arrows emanating from the <br /> intersections of re Figure great circles in Fi 5 resent the trends of the intersections of the two <br /> 9 9 P <br /> surfaces represented by each pair of great circles. In this case, there are three sets of <br /> 10 <br />