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Junuurv 15, 2008 <br />FLOC (fersion 5.00) <br />¦ <br />¦ <br />¦ <br />Page 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 10-5 fps are considered <br />negligible and in equilibrium) <br />For the case when the bedding is more steeply dipping. 68 11 of spoil is unstable. The <br />spoil needs to have improved properties. This was examined by case 95 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 #5c <br />indicates that a 30 11 high spoil pile is at the limit ofequilibrium when the spoils have a strength <br />of' 50 psf 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 of velocity. shown in Figure 19. show the unstable volume. The 38° friction and 50 psf <br />cohesion used for 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 />f:.quation 8. <br />Agapito Associates. Inc.