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<br />4.0 Stability Analysis <br />J ~ 4.I INTRODUCTION <br />The stability evaluations for the Blue Ribbon Mine bench project <br />J were based on several aspects, including: <br />o slope stability under long-term steady-state conditions; <br />o effective stcess type analysis and model development; <br />o various slope and subsurface conditions expected; <br />o drain requirements; <br />o subsurface groundwater conditions. <br />I - Variations in the model were analyzed to determine the <br />1 sensitivity of the variations in conditions encountered. <br />' 4.2 MODEL DEVELOPMENT <br />The model development for the mine bench was based on conditions <br />observed during the field investigations, aerial topographic <br />information, subsurface conditions encountered during field <br />investigations, and on results of previous investigations <br />. conducted by Rocky Mountain Geotechnical. Several models of <br />I - various conditions encountered were prepared to evaluate the <br />slope stability conditions and to generate design requirements <br />I for later preparation of construction drawing and specifications. <br />I 4.3 ANALYSIS <br />I Factors of safety against failures for assumed conditions, which <br />were developed through the model preparation, were determined <br />' ~ utilizing a computer-assisted Limit Equilibrium Method of Slices. <br />This particular program (SSTAB II) utilizes Spencer's method of <br />~__ <br />16 <br />