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January 15. 2008 Pijge 20 <br />Table 3. Results from Spoil Strength Calibration Cases <br />Case Spoil Friction Stabilih' Condition <br />1 55" Stable vel„,,,,- 101' <br />2 50" Stable velmn,-_ 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 1 instable Failed to "foe <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 />ofequilibrium (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 = =10°, 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 />Vectors <br /> <br />??u:l tc U.U? <br />.10,)-. tr: 0 01!-. <br />iwi -, tr oo1-. <br />101- 1. 002:? <br />0.02_, I,_ n 025; <br />002,-- k. 0030 <br />0.03:, tc 0035 <br />0.03 5 tc 00,39 <br />Interval - 5, ,;e 003 <br />Q-Floor Mudstone <br />North <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". ('ohesion= 0. <br />Tension - 0) from Model of Z-Dip Cut #2 Pit Spoil Pile <br />Agapito Associates. Inc.