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Geotechnical Evaluation of Mine-induced Earthquakes on Bruce Park Dam <br />Bowie Resources, Limited <br />June 2002 <br />0) 4.3.2.3 Water Pressures <br />The three groundwater conditions discussed in Section 4.3.1.3 were also considered in the <br />pseudo-static analysis. <br />4.3.2.4 Results <br />We considered potential failure surfaces passing only through the failure zone of the <br />landslide. Yield accelerations computed from the pseudo-static analyses for the three <br />groundwater conditions are summarized in Table 4.5. <br />Computer outputs of the pseudo-static analysis of the landslide are included in Appendix F. <br />TABLE 4.5 <br />RESULTS OF THE PSEUDO-STATIC ANALYSES ON POST-FAILURE <br />LANDSLIDE <br /> <br />Case <br />Phreatic Surface Yield Acceleration <br />a Coincidin with the round surface 0.01 <br />b Mid-depth 0.08 <br />C To of bedrock 0.17 <br />4.4 SHAKE Analysis <br />The cross section shown in Figure 4.3 was selected to construct one-dimensional model for <br />the shear wave propagation analysis to represent the post-failure configuration of the <br />landslide. <br />Material properties for the SHAKE analysis were developed in a similar manner as explained <br />in Section 3.5 and are presented in Table 4.6. <br />SHAKE analyses were performed for the four mine-induced earthquake motions presented <br />on Figures 2.2 through 2.5 (Magnitudes 4.2, 2.5, 2.0, and 1.75). Computer outputs of the <br />SHAKE analysis are included in Appendix G. <br />02-05-22 Gcotechnical Evaluation of %latc-Induced Eanhquaka <br />GEI Consultants, Inc. 16