PERMFILE115275

• Permit No: C1981041A
• IBM Index Class Name: Permit File
• Doc Date: 5/13/2002
• Doc Name: Subsidence Appendices
• Section_Exhibit Name: TAB 20 APPENDIX 20-4 TO APPENDIX 20-9
• Media Type: D
• Archive: Yes

• • •
TABLE 1. Pred icted Longwa
ubsidence Maxima for Virgin
Ground at Selected Overburden Depths
Mining Single Longwell Panel Multiple Longwell Panels
Depth Vertical Tensile Compressive Tilt Vertical Tensile Compressive Tilt
(f t) (Smyx ft) Strain Strain (G min) (S~x ft) Strain Strain (G min)
(+E Nf ) (-E yf) (+E .uE) (-E 4E)

1200 3.82 2500 4090 36.0 6.48 3510 2750 51.0
1500 2.74 1400 2900 20,9 6.48 2810 2200 40.8
1600 2.45 1150 2560 16.6 6.48 2630 2070 38.3
:~~•
2000 1.66 590 1600 8.5 6.48 2110 1650 30.0
2400 1.40 340 1110 4.9 6.48 1760 1380 22,5