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Jcmual-v 15, 2008 I'aKc Zfi <br />Table 3. Results from Spoil Strength Calibration Cases <br />Case Spoil Friction Stabilitv Condition <br />1 55' Stable vel_- 10 <br /> 50" Stable Veil""' 10" <br />3 45" Stable Local failure at Crest <br />4 42.5" Stable Local failure at Crest <br />5 40` Limit of Equilibrium Failed to Toe <br />6 37.5` l instable Failed to Toe <br />7 35° Unstable Failed to Toe <br />the tailed region for one of the unstable cases. Shown are contours in the high velocity (or <br />moving) region and large displacement vectors for case were spoil strength is less than the limit <br />ofequilibriunl (peak friction = 37.5°). <br />It can be concluded from this calibration analysis that the properties of the spoil should <br />be around peak friction =X10°, cohesion = 0. tension = 0). Applying these properties is <br />applicable in the K-Pit and G-Pit areas for spoil placed by dragline. They might be slightly <br />conservative for spoils placed by truck and shovel fleet because of added compaction due to <br />hauling over the spoil pile. <br />Spoil <br />t •, II-u: ol \ ell. Its <br />?1u:,1 U? rJ U?r <br />1.101-) tc 0 01'', <br />1)01 tr 001• <br />n ()I if, 0 02J <br />Ci.02_ tc 0 025 <br />0.025 lc 0 030 <br />0.03. 1C U 035 <br />1-1.0-15 tc U CI A# <br />InterN•a' - 5 Oe 003 <br />Vectors <br />Mudstone <br />td o) th <br />Figure 16. Unstable Velocity Contours and Large Displacement Vectors for Case where <br />Spoil Strength is at the Limit of Equilibrium (Friction 37.5`. Cohesion 0. <br />Tension = 0) from Model of Z-Dip Cut #2 Pit Spoil Pile <br />Agapito Associates, Inc.