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

Residual Shear Test Job No.: 7110
Project: West Elk Mine RPE Expansion - #06261003
Boring No.: B-6 Sample No. Depth: 34.5-36.5 Test Date: 8/18/2009
Location: Sample Type: Core Date Re orted: 1 9/8/2009
,oil 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.
Liquid Limit:
51.1
Specimen were then shear several time until readings were consistent to develope a residual shear strength.
Plastic Limit:
19.3
Plasticity Index:
31.8
Specific Gravity:
2.72
4
Failure Criterion:
Residual Stress A B C D
3.5
Initial Q X
Diameter (In.) 2.51 2.51 2.51
3
Thickness (In.) 0.91 0.79 0.79
Water Content (%) 64.0 64.0 64.0
N
Dry Density ( 61.7 61.7 61.7
t2.5
Before Shear
w
L
Thickness (In.l 0.68 0.53 0.51
U) 2
L
Water Content M) 39.1 31.6 28.3
Dry Densit f 82.3 91.3 96.0
N
Normal Stress 1.00 2.00
1.5
Max Shear Stress 0.56 1.04 8%
Residual Shear Stress 0.31 0.41 0.55
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."
0.5
Residual Residual
Friction Angle: il�-- 22.2 deg. Friction Angle: 6.5 deg.
0
Apparent 0.19 TSF Apparent 0.18 TSF
0
0.5
1 1.5
2 2.5
3
3.5
4 4.5 Cohesion Cohesion
Normal
Stress
(TSF)
2
1.75
1.5
C-1.25
CAI
t7
y
m 1
L
10.75
rn
i
r
0.5
.100
0.25
'
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)
11
9301 Bryant Ave. South Suite 107
INEERIN(" Bloomington, Minnesota 55420-3436
4�iSMINIG.
INC.