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GE®SYNTEC CONSULT Page !� of <br />Written by: T. Boardman Date: 14 Sept 1999 Reviewed by: 1"11 t�C0 Date: 10 KIdV <br />0 Client: Allied Waste Project: Forward Landfill Project/Proposal No.: WS0264 Task No.; --Q2 <br />Cover Stability Analyses <br />The cover stability analyses is performed using the infinite slope approach. The expression for the factor of <br />factor of safety is provided by Matasovic [1991 ] as follows: <br />Z)] AY <br />+ tan 0 1— �y "' �z — "'(Y —ks tan/3 tan 0 <br />z cost ,8 <br />FS = <br />ks + tans <br />where: <br />c = cohesion (psf) <br />y= unit weight of cover soil (pcf) <br />yW = unit weight of water (pcf) <br />z = vertical thickness of the layer (ft) <br />R = slope angle (degrees) <br />= angle of internal friction (degrees) <br />dW = vertical depth to water table (ft) <br />ks = seismic coefficient <br />FS = factor of safety <br />The expressions are explained in the figure. <br />Equation (1) <br />d <br />W <br />z <br />