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Geotechnical Evaluation of Mine-Induced Earthquakes on Bruce Park Dam <br />Bowie Resources, Limited <br />June 2002 <br />•? 4.3.1.4 Results <br />Results of the static analyses are presented in terms of factors of safety for the three water <br />pressure conditions in Table 4.3. <br />TABLE 4.3 <br />RESULTS OF THE STATIC ANALYSES ON POST-FAILURE LANDSLIDE <br />Case Phreatic Surface Static FOS <br />a Coinciding with the round surface 1.1 <br />b Mid-depth 1.5 <br />c To of bedrock 2.0 <br />Computer outputs of the static analysis of the landslide are included in Appendix E. <br />4.3.2 Pseudo-Static Analysis <br />4.321 Representative Cross Section <br />Representative cross section for the stability analysis is the same as the one used in the static <br />analysis of the post-failure stability analysis, which is shown on Figure 41. <br />4.3.2.2 Material Properties <br />lie <br />The material properties used in the pseudo-static analysis are summarized in Table 4.4. <br />Dynamic strength of the glacial till and bedrock was considered to be approximately 20 <br />percent lower than the static strength (Table 4.2) to allow for degradation due to cyclic <br />loading. The strength of the failure zone was not reduced because it was already considered <br />at its lowest value of residual strength. <br />TABLE 4.4 <br />MATERIAL PROPERTIES USED IN PSEUDO-STATIC STABILITY ANALYSES <br />OF THE POST-FAILURE LANDSLIDE <br />Strength Parameters Moist Saturated Streng th Parameters <br />Used in Pseudo-Static <br />Analysis Unit <br />Weight <br />(pcf) Unit <br />Weight <br />(pcf) Cohesion <br />c' <br />(psf) <br />Friction Angle <br />(degrees) <br />Glacial Till 130 132 0 21 <br />Failure Zone 126 128 0 22 <br />Bedrock 133 139 1600 25 <br />02-05-22 Geotechnical Evaluation of Mine-Induced Earthquakes <br />GEI Consultants, Inc. 15