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

Project:
Boring #:
Soil Type
1.2
N
0.8
uyi 0.6
m
L
(L
4) 0.4
0
IL
0.2
0
3-
2.5 -
N
2-
N
N
d
N1.5
0
� 1-
00.5 -
0+
3.5 -
3.0
0
2.5
N
ai 2.0
N
1.5
1.0 +
0
3
N
S2
N
N
01
N
y 1
t
N
0
0
TRIAXIAL TEST ASTM: D 4767 Pao - 4%f gi10
Date: 8/14/09
West Elk Mine RPE Expansion - #06261003
B -6 Sample #: Type: 3T Depth (ft): 11.5 -13.5
Sandy Silt w/a trace of gravel (ML)
5 10 15 20
Axial Strain ( %)
1 2 3 4
Normal Stress (p') (tsf)
Rupture Envelope at Failure
a = 26.1 ° a = 0.0 (tsf)
9301 Bryant Ave. South Suite #107
5 0 1 2 3 4 5 6 7 8 I
Normal Stress (tsf)
Effective �': 29.3 ° c'= 0.00 (tsf)
Total 0': 22.2 ° c= 0.00 (tsf)
OIL
NGINEERING Bloomington, Minnesota 55420 -3436
ESTING, INC.
Failure Criterion: Given Strain of: 15%
Angle of internal friction, �' = 29.3 °
Apparent Cohesion, c' = 0.00 (tsf)
Test Date: 7/31/09
Test Type: CU w /pp
Strain Rate (in /min): 00146
Strain Rate (% /min): 0.501
Liquid Limit: 369
Plastic Limit: 16.0
Plasticity Index: 20.9
Spec. Gravity (Assumed): 2.68
■
Before Consolidation
Diameter (in)
Height (in)
Water Content ( %)
Dry Density (pcf)
Void Ratiol
After Consolidation
Diameter (in)
Height (in)
Water Content ( %)
Dry Density (pcf)
Void Ratio
Back Pressure (tsf)
Minor Principal Stress (tsf)
Max. Deviator Stress (tsf)
Ultimate Deviator Stress (tsf)
Deviator Stress at Failure (tsf)
Max. Pore Pressure Buildup (tsf)
Pore Pressure Parameter "B'•
Pct. Axial Strain at Failure
A
B
C
D
E
1.45
2.95
17.5
109.4
0.53
1.42
2.91
17.1
114.7
+
0.46
5.8
2.00
2.55
2.55
2.43
X
0.97
1.0
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
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.
9
3
2
0
I
'
5 0 1 2 3 4 5 6 7 8 I
Normal Stress (tsf)
Effective �': 29.3 ° c'= 0.00 (tsf)
Total 0': 22.2 ° c= 0.00 (tsf)
OIL
NGINEERING Bloomington, Minnesota 55420 -3436
ESTING, INC.