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• <br /> <br />• <br />I • <br />West Elk Mine <br />Coal Pad Expansion Stability Analysis <br />Ciralar Failure Surface Search <br />Pseudostatic-Seismic Acceleration = 0.059 <br />Spencer Method <br />Minimum F.S. = 1.3 <br />File: padrev3p <br />Date: 9-97 <br />By: G. Eddy <br />Material Properties: <br />Coal Stockpile: uw = 75 pcf, c = 0, phi = 40 degrees <br />Coal Pad Fill: uw = 128 pd, c = 410 psf, phi = 27 degrees <br />Foundation Soil: uw =128 pcf, c = 470 psf, phi = 27 degrees <br />:,, <br />~-°~ <br /> <br />S.S <br />6.3i <br />• 0.3: <br />53 <br />5.;: <br />5.32 <br />6.>I <br />0 5.:p <br />0.29 <br />i19 <br />527 <br />- 0.26 <br />'J <br />o.i9 <br />61< <br />6.13 <br />6.21 <br />6.11 <br />5.25 <br />5.15 <br />6.16 <br />6.17 <br />p IO 20 3D W 50 6C 7p 90 9C ICO Ilp 12D 730 id0 19p I60 170 19p 79p 200 21D 22p 2-'0 : "+ 1EC 25p lip 29p 29p 700 <br />Harizontnl pistance (ft) <br />,.._.'- <br />.. ~ k ,' - <br />