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J117711cr?•v 15. 008 <br />FMC (Version 5.00) <br />¦ <br />¦ <br />¦ <br />PeWe 31 <br />Figure 18. Contours of Velocity at Equilibrium for 13HAV Slope Angle and 68-ft-high <br />Pile Under Saturated Residual Strength Condition for Q-Floor Mudstone <br />Bedding Dipping at 13° (Note: velocities less than 10, Ips are considered <br />negligible and in equilibrium) <br />For the case when the bedding is more steeply dipping, 68 N of spoil is unstable. The <br />spoil needs to have improved properties. This was examined by case #5 where the bedding dip <br />was increased to 25° and compaction was assumed for the spoils. The 25° is beyond the <br />maximum bedding dip but the analysis provides an upper-bound limit to stability. Case 95c <br />indicates that a 30 It high spoil pile is at the limit of equilibrium when the spoils have a strength <br />of 50 psi' cohesion and friction is reduced to 38° (no cohesion reduction was assumed). The <br />predicted failure mode was again determined from high velocities and shear strain increments. <br />Contours ofvelocity, shown in Figure 19, show the unstable volume. The 38° friction and 50 psf <br />cohesion used tier this limit ofequilibrium condition was compared to the assumed spoil strength <br />of 40° friction and and 50 psf cohesion to compute the safety factor of FOS = 1.07 using <br />Equation 8. <br />Agapito Associates, Inc.