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. Environmental Stratagies (West Elk Mine Rd.) <br />Triaxial Consolidated Undrained /with Pore Pressure / Multi-Staged <br />35+00 at ] 0-12 feet <br />• <br />• <br />Phase 1 2 3 <br />Drill hole 35+00 ~' <br />Sample <br />Depth (ft) 10-12 <br /> W (%) 12.8 ~ i s <br />,y yd (pcf) 105.9 <br /> eo <br /> B ~ ~ <br /> w (%) 22.3 <br />~ yd (pcf) ^~ 116.7 <br />.S <br />~, eo <br /> B <br /> Back pressure (psi) 40 40 40 <br /> Sh•ain rate (in/min) 0.0042 0.0042 0.0042 <br /> M <br />b t+l <br />b cn <br />b c~1 <br />b cn <br />~? ~ <br />b <br /> <br />Stress conditions <br />b _'. <br />b _ <br />b -~ <br />~ _ <br />b <br /> ~ ~ cd <br /> w ~ w ~ n. ~ <br /> e (%) 4.52 7.57 13.79 <br /> Time to Fail (min) 42.5 41.5 79.3 <br /> a3 (psf) 936 2002 4003 <br />y <br /> al-a3 (psf) 1584 2435 3946 <br /> <br />"' al (psf) 2520 4436 7949 <br />o Q = (al-x3)/2 (psf) 792 1217 1973 <br />~ P = (al+x3)/2 (psf) 1728 3219 5976 <br /> u (psf) 446 763 1771 <br /> A = u/(al-a3) 0.282 0.313 0.449 <br /> s (%) 4.52 7.57 13.79 <br />ti Time to Fail {min) 42.5 41.5 79.3 <br />y o'3 (psf) 490 1238 2232 <br />,~', a'1-a'3 (psf) 1584 2435 3946 <br />~~ dl (psf) 2074 3673 6178 <br /> Q' _ (a'1-d3)/2 (ps 792 1217 1973 <br />w P' _ (a'1+x'3)/2 (psf) 1282 2456 4205 <br /> a'1/a'3 4.24 2.97 2.77 <br />Summary of strength paramaters Total stress Effective stress <br />~ (deg) 16 24 <br />c (psf) 320 Z50 <br />Slope of P-Q, a (deg) 16 22 <br />cupp_35+00(x)10-]2ft <br />Summary <br />