2011-09-23_REPORT - C1980007 ‎(8)‎

• Permit No: C1980007
• IBM Index Class Name: REPORT
• Doc Date: 9/23/2011
• Doc Name: Spring 2011 Subsidence Report - Appendix A Thru C ‎(Part 2 of 3)‎
• From: Wright Water Engineers, Inc
• To: DRMS
• Permit Index Doc Type: Subsidence Report
• Email Name: TAK
• Media Type: D
• Archive: No

Parameter I
Panels El - E4 (t = 8 to 14 ft) I
Panels E5 - E8 (t = 12 to 14 I
Panel E9 (t = 12 to 14 ft)
W /d:
El
Max
: 1080 / 625 = 1.73
E5: 1080 / 500 = 2.16
E9: 1080 / 500 = 2.16
1080 /
Min
1080 / 1425 = 0.76
1100 = 0.98
1080 / 550 = 1.96
E2
Max
: 1080 / 400 = 2.70
E6: 1080 / 500 = 2.16
1080 /
Min
1080 / 1100 = 0.98
1200 = 0.90
E3
Max
: 1080 / 500 = 2.16
E7: 1080 / 550 = 1.96
1080 /
Min
1080 / 1100 = 0.98
1250 = 0.86
E4
Max
: 1080 / 400 = 2.70
E8: 1080 / 675 = 1.60
Min
1080 / 1025 = 1.05
1080 / 825 = 1.31
t = 8ft
t =14ft
t =12ft
t =14ft
t =12ft
t =14ft
Scp = acp • t (3)
0.80 to 2.4 ft
1.4 to 4.2 ft
1.2 to 3.6 ft
1.4 to 4.2 ft
1.2 ft
1.4 ft
(a S /t)
(0.1 to 0.3)
(0.1 to 0.3)
(0.1 to 0.3)
(0.1 to 0.3)
(0.1)
(0.1)
S a•t
4.8 to 6.4 ft
8.4 to 11.2 ft
7.2 to 9.6
8.4 to 11.2 ft
8.4 to 9.6 ft
9.8 to 11.2 ft
(a = Sm /t)
(0.6 to 0.8)
(0.6 to 0.8)
(0.6 to 0.8)
(0.6 to 0.8)
(0.7 to 0.8)
(0.7 to 0.8)
S (5)
0.00377 to
0.0160
0.00590 to
0.0280
0.00576 to
0.0192
0.00672 to
0.0224
0.01527 to
0.0192
0.01782 to
0.0224
M (2.2 to 2.3 S /d) (6)
0.007 to 0.037
0.013 to 0.064
0.0.04013 to 4
0.015 to 0.052
0.034 to 0.044
0.039 to 0.052
E (in terms of Sm /d)
0.004 to 0.022
0.007 to 0.039
0.007 to
0.027
0.008 to 0.031
0.018 to 0.027
0.021 to 0.031
(1.2 to 1.4 Sm /d)
-E (in terms of Sm /d)
(7)
-0.004 to -
-0.007 to -
-0.007 to -
-0.008 to -
-0.018 to -
-0.021 to -
(-1.2 to -1.5 Sm/d)
0.024
0.042
0.029
0.034
0.029
0.034
Maximum Crack 1
5 -10ft
5 -15ft
5 -10ft
5 -15ft
5 -10ft
5 -15ft
Depth (8) 2
10 -20ft
15 -35ft
15 -25ft
15 -35ft
15 -25ft
15 -35ft
Break Angle (9)
0 -5°
0 - 5°
0 - 5°
0 - 5°
0 - 5°
0 - 5°
Angle of Draw (9)
10 - 20°
10 - 20°
10 - 20°
10 - 20°
10 - 20°
10 - 20°
•
•
•
(
(
(3)
(4)
(5)
TABLE 2
MAXIMUM SUBSIDENCE PARAMETERS FOR
SOUTH OF DIVIDE MINING AREA (l)
Maximum tilt and strain parameters apply only to ground surfaces with slopes less that 30 percent; values may be
greater on slopes steeper than 30 percent.
All panels are numbered according to planned panel identifications.
Subsidence and subsidence factor above chain pillars.
Subsidence (maximum vertical displacement) above longwall panel centers, based on planned coal extraction
thickness listed.
Ratio of the range of maximum vertical displacement to overburden depth range for the nine planned longwall