2008-02-22_APPLICATION CORRESPONDENCE - C2008086 ‎(43)‎

• Permit No: C2008086
• IBM Index Class Name: Application Correspondence
• Doc Date: 2/22/2008
• Doc Name: PDEIS Appendix C Subsidence
• Media Type: D
• Archive: No

Table 8. Maximum Vertical Subsidence (Smax) for Planned Red Cliff Mine Longwall Panels
Panel Overburden Width/ Supercritical, Smax/m Smax Distance, from Panel
Width Depth Depth Critical or Subsidence Centerline Ribside
feet feet Ratio Subcritical Factor from to from to
(meters) (meters) (feet) Panel (feet) (feet) (feet )
800 200 4.000 Supercritical 0.810 0 +10 -400 - 390
(243.8) (61.0) (8.91)
500 1.600 Supercritical 0.810 0 +25 -400 - 375
(152.4) (8.91)
1000 0.800 Subcritical 0.681 0 0 -400 - 400
(304.8) (7.49)
1500 0.533 Subcritical 0.435 0 0 -400 - 400
(457.2) (4.79)
2000 0.400 Subcritical 0.292 0 0 -400 - 400
(609.6) (3.21)
900 200 4.500 Supercritical 0.810 0 +10 -450 - 440
(274.3) (61.0) (8.91)
500 1.800 Supercritical 0.810 0 +25 -450 - 425
(152.4) (8.91)
1000 0.716 Subcritical 0.716 0 0 -450 - 450
(304.8) (7.87)
1500 0.600 Subcritical 0.490 0 0 -450 - 450
(457.2) (5.39)
2000 0.450 Subcritical 0.342 0 0 -450 - 450
(609.6) (3.76)
1000 200 5.000 Supercritical 0.810 0 +10 -500 - 490
(304.8) (61.0) (8.91)
500 2.000 Supercritical 0.810 0 +25 -500 - 475
(152.4) (8.91)
1000 1.000 Subcritical 0.747 0 0 -500 - 500
(304.8) (8.22)
1500 0.667 Subcritical 0.549 0 0 -500 - 500
(457.2) (6.04)
2000 0.500 Subcritical 0.396 0 0 -500 - 500
(609.6) (4.36)
1100 200 5.500 Supercritical 0.810 0 +10 -550 - 540
(335.8) (61.0) (8.91)
500 2.200 Supercritical 0.810 0 +25 -550 - 525
(152.4) (8.91)
1000 1.100 Subcritical 0.765 0 0 -500 - 500
(304.8) (8.42)
1500 0.667 Subcritical 0.598 0 0 -500 - 500
(457.2) (6.58)
2000 0.500 Subcritical 0.550 0 0 -500 - 500
(609.6) (4.85)
C-29
DBMS 321