2009-01-15_REPORT - C1980007 ‎(8)‎

• Permit No: C1980007
• IBM Index Class Name: REPORT
• Doc Date: 1/15/2009
• Doc Name: Fall 2008 Subsidence Monitoring Report
• From: Wright Water Engineers, Inc
• To: DRMS
• Permit Index Doc Type: Subsidence Report
• Email Name: TAK
• Media Type: D
• Archive: No

• TABLE 2
MAXIMUM SUBSIDENCE PARAMETERS FOR
SOUTH OF DIVIDE MINING AREA (')
•
Parameter Panels E1 - E4 (t = 8 to 14 ft) Panels E5 - E8
(t = 12 to 14 Panel E9 (t = 12 to 14 ft)
)
W/d: E1
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
SAP=arp•t(3) 0.80 to2.4ft 1.4 to4.2ft 1.2 to3.6ft 1.4 to4.2ft 1.2 ft 1.4 ft
(a.p=S.p/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)
Sm=a•t(4) 4.8 to6.4ft 8.4 to11.2ft 7.2 to 9.6 8.4 to 11.2 ft 8.4 to9.6ft 9.8 to11.2ft
(a = Sdt) (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)
Sm/d (5) 0.00377 to 0.00590 to 0.00576 to 0.00672 to 0.01527 to 0.01782 to
0.0160 0.0280 0.0192 0.0224 0.0192 0.0224
Mm (2.2 to 2.3 S'dd) (6) 0.007 to 0.037 0.013 to 0.064 0.0

13 t
0.044

0.015 to 0.052

0.034 to 0.044

0.039 to 0.052
Em (in terms of Sr„/d)
(7) 0.004 to 0.022 0.007 to 0.039 00
07 t 0. 008 to 0.031 0.018 to 0.027 0.021 to 0.031
(1.2 to 1.4 Sm/d) .
-Em (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 Sdd) 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 (
) 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°
(') 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.
(Z) All panels are numbered according to planned panel identifications.
(3) Subsidence and subsidence factor above chain pillars.
(4) Subsidence (maximum vertical displacement) above longwall panel centers, based on planned coal extraction
thickness listed.
(5) Ratio of the range of maximum vertical displacement to overburden depth range for the nine planned longwall