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.1(mmirY 1 5. 000 <br />500 <br />Pgi,e 4 <br /> <br />Mile <br />Figure 14. Surveyed Section of Z,-Dip Cut #2 Pit Spoil Failure Showing Pre-Slide <br />(Green Line) and Post-Slide Profile (Magenta) <br />and silty mudstune bedding immediately below the Q-Seam. The material below the Q-Floor <br />mudstune was assumed to be a sandstone material. No other bedding planes were simulated. All <br />the rock was assumed to behave according to a Mohr-Coloumb relation of elastic (perfectly <br />plastic). The mudstune simulated the thinly bedded behavior using a ubiquitous joint behavior to <br />simulate a weakness along the bedding (dip 8° to north). Table 2 shows the material properties <br />used for this spoil calibration analysis. Assuming negligible cohesive and tensile strength ofthe <br />spoils reasonably represents the freshly-placed condition of the spoils. <br />Table 2. Mechanical Properties Used in the ZD-02 Spoil Calibration FLAC3D <br />Model <br /> Young' RM <br /> Density Modulus, E Poisson's Cohesion RNI RM Tensile <br />Strata (pcf] (pst) Ratio (ksf) Friction (°) (kso <br />Sandstone I ?; '-.3 71.1 0_14 I._,, 25.8 6.0 <br />Q-Floor Mudstone 114.8 48.3 0.37 35.1 0 5.8/5 5.1/0 <br />Spoil 125 3.5 0.35 0 - 0 <br />Agapito Associates. Inc.