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v <br />FIGO -3 <br />COVER SLOPE STABILITY LYSIS- INFINITE SLOPE <br />NORTH COUNTY RECYCLING CENTER AND SANITARY LANDFILL <br />Case: Unsaturated slope at 3:1 (H:V) <br />Final cover thickness: <br />h= <br />2 ft <br />Data: Vertical Cover Thickness: <br />Z = <br />2 ft <br />Cover Soil Density: <br />y = <br />110 pcf <br />Soil/Interface Layer Properties: <br />c = <br />0 psf <br />= <br />26 degrees <br />Slope Angle (3:1, H:V) <br />a = <br />18 degrees <br />Seismic Coefficient (g) <br />ks = <br />0.00 g <br />Vertical depth to water table (ft) <br />d,N = <br />2 ft <br />Assumes slope is drained <br />Unit weight of water (pcf) <br />y„, = <br />62.4 pcf <br />Fill Slope <br />Under Static conditions, the value of ks 0. The final cover is unsaturated, i.e. dW = 4.5' <br />1). Static Factor of Safety= c/(y z cost a) + tan �[1—(y„,(z-dw))/(yz)] - ks tan a tangy _ <br />ks + tan a <br />Under Pseudo -static conditions, the value of ks= (a value) at FOS=1.0. <br />For this case, the final cover is unsaturated, i.e. dw = 4.5' <br />1). Pseudo -static Factor of Safety= c/(y z cost a) + tan �[1—(y4z-dw))/(yz)] - ks tan a tangy <br />ks + tan a <br />Solve for Factor of Safety = 1.0: <br />Pseudo -Static <br />Yield Acceleration = k Factor of Safety <br />0.15 g 1.00 <br />irface <br />1.54 <br />Note: " - From Matasovic, N., 1991, As referenced in Richardson, G.N., et. Al., 1995, RCRA Subtitle D (258) <br />Seismic Design Guidance for Municipal Solid Waste Landfill Facilities, USEPA Publication EPA/600/R-95/051. <br />Figure B-3_NCRCSL_Cover stabilityAs <br />