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Environmental Strategies (West Elk Mine Rd.) <br />• Triasial Consolidated Undrained !with Pore Pressure /Multi-Staged <br />17+00 at 5-7 feet <br />CJ <br />• <br />Phase 1 2 3 <br />Drill hole 17+00 <br />Saznple <br />Depth (ft) 5-7 <br /> w (%) 23.6 ~ <br />.Y yd (pcfl 102.8 <br />,~ eo ~ , <br /> <br /> w (%) ~ / 24.3 <br /> yd (pcf) 108.8 <br /> <br />w eo <br /> B <br /> Back ressure (psi) 39.5 39.5 39.5 <br /> Strain rate (in/min) 0.0081 0.0081 0.0081 <br /> C'1 <br />b M <br />b M <br />b M <br />b M <br />b M <br />b <br /> Stress conditions b -b b -b b -b <br /> <br /> P. ~, R. ~ W <br /> s (%) 5.02 7.60 13.52 <br /> Time to Fail (min) 37.5 18.5 40.5 <br />N a3 (psf) 994 2002 4003 <br />~ al-a3 (psf) 2496 3504 4697 <br />`n al (psf) 3489 5506 8700 <br /> Q = (al-a3)/2 (psfl 1248 1752 2348 <br /> P = (al+a3)/2 (psf) 2241 3754 6352 <br /> u (psf) 259 490 1310 <br /> A = u/(a1~3) 0.104 0.140 0.279 <br /> e (%) 5.02 7.60 13.52 <br />y Time to Fail (min) 37.5 18.5 40.5 <br />~ a'3 (psf} 734 1512 2693 <br /> a'1-a'3 (psf) 2496 3504 4697 <br />~~ a'I (psi 3230 5016 7390 <br />w Q' _ (a'1-a'3)I2 (psf) 1248 1752 2348 <br />w P' _ (a'1+a'3)l2 (psf) 1982 3264 5041 <br /> a'1/o'3 4.40 3.32 2.74 <br />Summary of strength parameters Total stress Effective stress <br />~ (deg) 15 21 <br />c (psf) 700 550 <br />Slope of P-Q, a (deg) 15 20 <br />cupp_I 7+GOQS-7R <br />Summary <br />