2014-08-19_PERMIT FILE - C1980007 ‎(4)‎

• Permit No: C1980007
• IBM Index Class Name: Permit File
• Doc Date: 8/19/2014
• Doc Name: Laboratory Test Data
• Section_Exhibit Name: Exhibit 82 Appendix B
• Media Type: D
• Archive: No

TRIAXIAL TEST ASTM: D 4767 Job No. 7110
Date: 8/14/09
'roject: West Elk Mine RPE Expansion - #06261003
3oring #: B-6 Sample #: Type: 3T Depth (ft): 11.5-13.5
Soil Type: Sandy Silt w/a trace of gravel (ML)
1
m o.8
0.6
a
0 0.9
0
a
0.2
0
3
2.5
a
2
N
d
N1.5
1
80.5
0
3.5
3.0
s
2.5
2.0
1.5
1.0
0
3
w
0
5 10 15
]Axial Strain (%)
I 1 2 3 4
Normal Stress (p') (tsf)
Rupture Envelope at Failure
a= 26.9 ° a= 0.0 (tsf)
9301 Bryant Ave. South Suite #107
Failure Criterion: Max. Stress Ratio
Angle of internal friction, q' = 30.50
Apparent Cohesion, c'= 0.00 (tsf)
Test Date: 7/31/09 Liquid Limit: 36.9
Test Type: CU w/pp Plastic Limit: 16.0
Strain Rate (in/min): 0.0146 Plasticity Index: 20.9
Strain Rate (%/min): 0.501 Spec. Gravity (Assumed): 2.68
Before Consolidation A B C D E
Diameter (in) 1.45
Height (in) 2.95
Water Content (%) 17.5
■ Dry Density (pcf)l 109.4
Void Ratiol 0.53
After Consolidation
Diameter (in) 1.42
Height (in) 2.91
Water Content (%) 17.1
0 Dry Density (pcf) 114.7
Void Ratio 0.46
Back Pressure (tsf) 5.8
Minor Principal Stress (tsf) 2.00
Max. Deviator Stress (tsf) 2.55
Ultimate Deviator Stress (tsf) 2.55
+ Deviator Stress at Failure (tsf) 2.21
Max. Pore Pressure Buildup (tsf) 0.97
Pore Pressure Parameter "B" 1.0
Pct. Axial Strain at Failure 6.2
"These test results are for informational purposes only and must be reviewed by a
qualified professional engineer to verify that the test parameters shown are
X appropriate for any particular design"
Remarks: Radial drainage strips applied to trimmed specimen; Saturated, backpressured
until "B" response was 0.95 to 1.00; Consolidated; All Drainage valves closed and
immediately sheared.
20 L_
4
3
2
1
0
5 0 1 2 3 4 5 6 7
Normal Stress (tsf)
Effective 0': 30.50 c'= 0.00 (tsf)
Total 0': 20.9 ° c= 0.00 (tsf)
OIL
NGINEERING Bloomington, Minnesota 55420-3436
ESTING, INC.
8