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PILE STABILITY ANALYSES <br /> Stability analyses were performed for the pile using <br /> the Simplified Bishop method. This included both static <br /> analyses and pseudo-static analyses to simulate earthquake <br /> loading by applying a horizontal force equal to 0. 05 g to <br /> each slice. <br /> Material properties used in the stability analyses <br /> were developed from triaxial testing of the coal waste and <br /> rock tunnel waste, and from direct shear testing of the al- <br /> luvial foundation material. Coal waste properties were taken <br /> from the Morrison-Knudsen report "ENGINEERING EVALUATIONS, <br /> COAL BASIN MINE". Properties of the alluvium and rock waste <br /> were obtained from testing of the materials by Lincoln-Devore, <br /> as presented in Vol. 2, Coal Basin Mine Permit Application. <br /> All stability analyses were run assuming that the <br /> foundation material was saturated, that is , with the piezo- <br /> metric surface at the surface of the alluvium. This is a <br /> reasonable assumption for worst-case conditions . It implies <br /> complete drainage of the pile, but not of the foundation. The <br /> possibility of a foundation failure with the failure surface <br /> extending into the alluvium has been evaluated as part of the <br /> stability analyses . <br /> 112 <br />