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FROM I[~S.LAB._Inc,SALTLRI~CIN.LIT PHOt~ NO. : 891606111 May. 28 2003 07:i1FlM P2 <br />• Environmental Stratgies ('West Elk Mine) <br />Triaxial Consolidated Undraincd /with Pore Pressure / Muttl-Staged <br />19+00 at 5-7 feet <br />• <br />• <br />Phase ] 2 3 <br />Drill hole 19+00 <br />Sample <br />bepth (ft) 5-7 <br /> w (%) 14.2001 <br />.p yd ( f) 114.861 <br />~ ~ <br /> B <br /> w % 20.1 <br />'~ yd (pcf) 122.4 <br />w eo <br /> B <br />Back pressure ( si 44.5 44.5 44.5 <br />Strain rate (in/min) 0.0049 0.0049 0.0049 <br /> <br /> <br />S'treSS GOndltlOnS ,n <br />b <br />b <br />a i`~ <br />b <br />b <br />~ M <br />b <br />b <br />a. m <br />b <br />b <br />~ M <br />b <br />~ <br />w cn <br />b <br />b <br />~ <br /> a (%) 6.72 13.99 22.16 <br /> Time to Fail (min) 41.0 402 41.3 <br />H 63 (psf) 1008 2002 4003 <br /> 61-x3 (psfl 2248 3119 4214 <br />~ 61 (psf) 3256 5121 8217 <br />F Q = (61-63)/2 (psf) <br />P=(R1+63~2(ps~ 1124 <br />2132 1560 <br />3561 2107 <br />6110 <br /> u (psfj 331 ,562 1210 <br /> = 61-x3 O.t47 0.180 0.287 <br /> s (%) 6.72 13.99 22.16 <br />~ Time to Fail (min) 41.0 40.2 41.3 <br />b a'3 (psf) 677 1440 2794 <br /> dl-6'3 (psf) 2248 3119 4214 <br />'~ 6'1 (psf) 2925 4559 7007 <br /> Q' _ (6'I-6'3)/2 (psf) 1124 1560 2107 <br />w P' _ (6' I+6'3)/2 (psf) 1801 3000 4901 <br /> 6'1/d3 4.32 3.17 2.51 <br />Summa of strength parameters Total stress Effective stress <br />~ (deg 14 18 <br />c (psf) 640 580 <br />Slope of P-Q, a (deg) 14 I7 <br />19+00_°t_5.7 e~p_xt°ged_3pn A°mb°It <br />Summary <br />F:V'ROJECI'S_20031t°vimnmcnml Strata~iesl(19+00 at_5.7_cupp xla~ed_3yts_~mb°I[xlslSmnmary <br />