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7.1.2 West Quarry Kinematic Analyses <br /> Result of the West Quarry Kinematic Analyses are organized by local and global failure <br /> modes, where local failures modes represent individual benches and global failure modes <br /> represent multiple benches. The West Quarry dataset is based on results of geologic <br /> reconnaissance mapping and the number of discontinuity measurements is significantly less <br /> than the number of measurements from the South quarry. Results of the analyses indicate the <br /> several kinematic failures are possible with the wide range of excavation orientations, but the <br /> limited data set at the West Quarry needs to be supported by information obtained during <br /> mining and excavation. Results are summarized in Table 7-2 below. <br /> Table 7-2. Summarized Results of Kinematic Evaluation of West Quarry <br /> Orientations with Potential for Failure <br /> Analysis <br /> North Highwall Northwest Highwall Southwest Highwall <br /> Wedge Sliding 14% 15% 13% <br /> Planar Sliding 3% 3% 14% <br /> Local <br /> Flexural Toppling 7% 7% 24% <br /> Direct Toppling 10% 12% 19% <br /> Wedge Sliding 7% 13% 15% <br /> Planar Sliding 0% 3% 10% <br /> Global <br /> Flexural Toppling 3% 0% 3% <br /> Direct Toppling 3% 2% 1% <br /> 7.2 Slope Stability Analyses <br /> 7.2.1 South Quarry <br /> Results from the SLOPE/W and FLAC/Slope cut slope stability analyses of the South Quarry <br /> are provided in Table 7-3 and Table 7-4 for global and local strengths, respectively. These <br /> results include summary of the bench configurations analyzed for the global and local failure <br /> mechanisms described in Section 6.3. Analyses result figures that depict the critical failure <br /> surfaces and resulting FOS for each case are presented in Appendices E and F <br /> In general, SLOPE/W and FLAC/Slope resulted in similar critical failure surfaces, though <br /> SLOPE/W tended to result in higher estimated FOS than FLAC/Slope method of analysis. <br /> The slip surfaces for the global analyses were defined to enter from the top of the slope and <br /> exit through the bottom, going through the entire height of the highwall or considered region. <br /> When the highwall was analyzed with global properties applied to the entire rock mass, the <br /> FOSS were above 2.0 for SLOPE/W and above 1.56 for FLAC/Slope for all bench <br /> configurations presented in Table 7-3. The FOSs were lower when the presence of <br /> 36 <br /> Aggregate Industries—Morrison Quarry GEI Consultants, Inc. <br /> AM-07 Geotechnical Stability Exhibit October 2020 <br />