2010-04-26_PERMIT FILE - C1980007A ‎(7)‎

• Permit No: C1980007A
• IBM Index Class Name: Permit File
• Doc Date: 4/26/2010
• Doc Name: Laboratory Test Data
• Section_Exhibit Name: Exhibit 82 Appendix B
• Media Type: D
• Archive: Yes

TRIAXIAL TEST ASTM: D 4767 Job No. 7110
Date: 8/14/09
Project: West Elk Mine RPE Expansion - #06261003
Boring #: B -6 Sample #: Type: 3T Depth (ft): 11.5 -13.5
Soil Type: Sandy Silt w/a trace of gravel (ML)
l.z
1
0.8
a
0.6
m
a
i 0.4
0
IL
0.2
0
3
2.5
N
2
N
N
d
N1.5
� 1
m
i
00.5
0
3.5
3.0
0
m 2.5
N
m 2.0
in
1.5
1.0
0 5 10 15
Axial Strain (�)
3
N
S2
H
d
N
m 1
t
to
0 41
0
Angle of internal friction, V = 29.3 °
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 (%/m n): 0.501 Spec. Gravitv (Assumed): 2.68
Diameter (in) 1.45
Height (in) 2.95
Water Content ( %) 17.5
■ Dry Density (pcf) 109.4
Void Ratio 0.53
After Consolidation
Diameter (in) 1.42
Height (in) 2.91
Water Content ( %) 17.1
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) 2.43
Max. Pore Pressure Buildup (tsf) 0.97 1
Pore Pressure Parameter "B" 1.0 1
Pct. Axial Strain at Failure 15.0
"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 I 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
1 2 3 4
Normal Stress (p') (tsf)
Rupture Envelope at Failure
a= 26.1 ° a= 0.0 (tsf)
5 0 1 2 3 4 5 6 7
Normal Stress (tsf)
Effective 0': 29.3 c'= 0.00 (tsf)
Total 0% 22.2 c= 0.00 (tsf)
8
I C STING, IL
9301 Bryant Ave. South Suite #107 GINEERING Bloomington, Minnesota 55420 - 3436
INC.