2011-09-30_PERMIT FILE - C1980007A ‎(7)‎

• Permit No: C1980007A
• IBM Index Class Name: Permit File
• Doc Date: 9/30/2011
• Doc Name: Laboratory Test Data
• Section_Exhibit Name: Exhibit 82 Appendix B
• Media Type: D
• Archive: Yes

Residual Shear Test Job No Page B -15 of72110
Project: West Elk Mine RPE Expansion - #06261003
Boring No.: B -6 Sample No. Depth: 34.5 -36.5 Test Date: 8/1872009
' ocation: Sample Type: Core Date Reported: 9/8/2009
Type: Fat Clay (CH) Shear Rate
0.0009 (in /min)
Remarks: Sample ground down through the #200 sieve and sand and gravel removed. Specimens were
incrementally loaded to given pressures. Specimens were then sheared to determine a peak shear value.
Specimen were then shear several time until readings were consistent to develope a residual shear strength.
Liquid Limit:
51.1
Plastic Limit:
19.3
Plasticity Index:
31.8
Specific Gravity:
2.72
4
Failure Criterion:
Residual Stress
A
B
C
D
3.5
Initial
A
0
Q
X
Diameter (In.)
2.51
2.51
2.51
Thickness (In.)
0.91
0.79
0.79
3
Water Content M)
64.0
64.0
64.0
_
LL
(n
H 2.5
N
P
Dry Density (pcf)
61.7
61.7
61.7
Before Shear
Thickness (In.)
0.68
0.53
0.51
Water Content M)
39.1
31.6
28.3
N 2
L
Dry Density (pcf)
823
91.3
1 96.0
r
N
Normal Stress
1.00
2.00
400
1.5
Max Shear Stress
0.56
1.04
1 82
Residual Shear Stress
031
0.41
065
1
'These tests are for informational purposes only and must be reviewed by a
qualified professional engineer to verify that the test parameters shown are
appropriate for any particular design. "
.5
Residual
Residual
Friction Angle: 22.2 deg.
Friction Angle- O= 6.5 deg.
0
Apparent 0.19 TSF
Apparent 0.18 TSF
0
0.5
1 1.5
2 25
3
3.5
4
4.5 Cohesion
Cohesion
Normal
Stress
(TSF)
2
1.75
1.5
LL1.25
N
H
M
d
1
in
�a
=0.75
N
i
I
0.5
025
0
0 0.25 0.5 0.75 1 1.25 1.5 1.75 2 2.25 2.5 2.75 3 3.25 3.5 3.75
Shear Displacement (inch)
9301 Bryant Ave South Suite 107 N(LINEERIN(i Bloomington. Minnesota 55420 -3436