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Project: <br />Boring #: <br />Type <br />1.2 <br />N <br />0.8 <br />N 0.6 <br />d <br />L <br />a <br />d 0.4 <br />0 <br />IL <br />0.2 <br />0 <br />3- <br />2.5 - <br />w <br />N <br />2- <br />N <br />N <br />d <br />N1.5 <br />0 <br />m 1- <br />_ <br />00.5 - <br />0. <br />3.5 - <br />3.0 <br />0 <br />2.5 <br />N <br />v 2.0 <br />in <br />1.5 <br />1.0: <br />0 <br />3 <br />N <br />2 <br />N <br />N <br />01 <br />N <br />L1 <br />N <br />04 <br />0 <br />TRIAXIAL TEST ASTM: D 4767 Pam- (Afv10 <br />Date: 8/14/09 <br />West Elk Mine RPE Expansion - #06261003 <br />B -6 Sample #: Type: 3T Depth (ft): 11.5 -13.5 <br />Sandy Silt w/a trace of gravel (ML) <br />5 10 15 <br />Axial Strain (%) <br />1 2 3 4 <br />Normal Stress (p') (tsf) <br />Rupture Envelope at Failure <br />-a= 24.8 ° a = 0.0 (tsf) <br />9301 Bryant Ave. South Suite #107 <br />raiiure Lntenon: Max. Deviator stress <br />Angle of internal friction, 0' = 27.5 ° <br />Apparent Cohesion, c' = 0.00 (tsf) <br />Test Date: 7/31/09 Liquid Limit: 36.9 <br />Test Type: CU w /pp Plastic Limit: 16.0 <br />Strain Rate (in /min): 0.0146 Plasticity Index: 20.9 <br />Strain Rate (% /min): 0.501 Spec. Gravity (Assumed): 2.68 <br />Before Consolidation A B C D E <br />Diameter (in) 1.45 <br />Height (in) 2.95 <br />Water Content ( %) 17.5 <br />■ Dry Density (pcf) 109.4 <br />Void Ratiol 0.53 <br />After Consolidation <br />Diameter (in) 1.42 <br />Height (in) 2.91 <br />Water Content ( %) 17.1 <br />Dry Density (pcf) 114.7 <br />Void Ratio 0.46 <br />Back Pressure (tsf) 5.8 <br />Minor Principal Stress (tsf) 2.00 <br />Max. Deviator Stress (tsf) 2.55 <br />Ultimate Deviator Stress (tsf) 2.55 <br />+ Deviator Stress at Failure (tsf) 2.55 <br />Max. Pore Pressure Buildup (tsf) 0.97 <br />Pore Pressure Parameter "B" 1.0 <br />Pct. Axial Strain at Failure 25.0 <br />"These test results are for informational purposes only and must be reviewed by a <br />qualified professional engineer to verify that the test parameters shown are <br />X appropriate for any particular design" <br />Remarks: Radial drainage strips applied to trimmed specimen; Saturated, backpressured <br />until "B" response was 0.95 to 1.00; Consolidated, All Drainage valves closed and <br />immediately sheared. <br />20 L_ <br />4 <br />3 <br />2 <br />1 <br />0 <br />5 0 1 2 3 4 5 6 7 <br />Normal Stress (tsf) <br />Effective 0': 27.50 c'= 0.00 (tsf) <br />Total 0': 22.9 ° c= 0.00 (tsf) <br />OIL <br />NGINEERING Bloomington, Minnesota 55420 -3436 <br />ESTING, INC. <br />8 <br />