Laserfiche WebLink
TABLE 2 <br />MAXIMUM SUBSIDENCE PARAMETERS FOR <br />SOUTH OF DIVIDE MINING AREA "' <br />Parameter <br />Panels E1 - E4 (t = 8 to 14 ft) <br />Panels E5 - f) (t = 12 to 14 <br />Panel E9 (t =12 to 14 ft) <br />W /d: <br />E1 <br />Max <br />: 1080/625 <br />= 1.73 <br />E5: 1080/500 = 2.16 <br />E9: 1080 / 500 = 2.16 <br />1080/ <br />Min <br />1080/1425 = 0.76 <br />1100 <br />= 0.98 <br />1080 / 550 = 1.96 <br />E2 <br />Max <br />: 1080/400 <br />= 2.70 <br />E6: 1080/500 = 2.16 <br />1080/ <br />Min <br />1080/1100 = 0.98 <br />1200 <br />= 0.90 <br />E3 <br />Max <br />: 1080/500 <br />= 2.16 <br />E7: 1080/550 = 1.96 <br />1080/ <br />Min <br />1080/1100 = 0.98 <br />1250 <br />= 0.86 <br />E4 <br />Max <br />: 1080/400 <br />= 2.70 <br />E8: 1080/675 <br />= 1.60 <br />Min <br />1080/1025 = 1.05 <br />1080/825 <br />= 1.31 <br />t =8ft <br />t =14ft <br />t =12ft <br />t =14ft <br />t =12ft <br />t =14ft <br />Sip= acp•t(3) <br />0.80 to2.4ft <br />1.4 to4.2ft <br />1.2 to3.6ft <br />1.4 to4.2ft <br />1.2 ft <br />1.4 ft <br />(a.p= S,p/t) <br />(0.1 to 0.3) <br />(0.1 to 0.3) <br />(0.1 to 0.3) <br />(0.1 to 0.3) <br />(0.1) <br />(0.1) <br />Sm= a•t(4) <br />4.8 to6.4ft <br />8.4 to11.2ft <br />7.2 to 9.6 <br />8.4 to11.2ft <br />8.4 to9.6ft <br />9.8 to11.2ft <br />(a = S dt) <br />(0.6 to 0.8) <br />(0.6 to 0.8) <br />(0.6 to 0.8) <br />(0.6 to 0.8) <br />(0.7 to 0.8) <br />(0.7 to 0.8) <br />Scold (5) <br />0.00377 to <br />0.00590 to <br />0.00576 to <br />0.00672 to <br />0.01527 to <br />0.01782 to <br />0.0160 <br />0.0280 <br />0.0192 <br />0.0224 <br />0.0192 <br />0.0224 <br />Mm (2.2 to 2.3 S'dd) (6) <br />0.007 to 0.037 <br />0.013 to 0.064 <br />0.013 t <br />0.015 to 0.052 <br />0.034 to 0.044 <br />0.039 to 0.052 <br />Em (in terms of Sm/d) <br />00.07 to <br />(7) <br />0.004 to 0.022 <br />0.007 to 0.039 <br />0.008 to 0.031 <br />0.018 to 0.027 <br />0.021 to 0.031 <br />(1.2 to 1.4 Sm/d) <br />-Em (in terms of %m d) <br />(» <br />-0.004 to - <br />-0.007 to - <br />-0.007 to - <br />-0.008 to - <br />-0.018 to - <br />-0.021 to - <br />( -1.2 to -1.5 Sm/d) <br />0.024 <br />0.042 <br />0.029 <br />0.034 <br />0.029 <br />0.034 <br />Maximum Crack 1 <br />5 -10ft <br />5 -15ft <br />5 -10ft <br />5 -15ft <br />5 -10ft <br />5 -15ft <br />Depth(') 2 <br />10 -20ft <br />15 -35ft <br />15 -25ft <br />15 -35ft <br />15 -25ft <br />15 -35ft <br />Break Angle (9) <br />0 -5° <br />0 -5° <br />0 -5° <br />0 -5° <br />0 -5° <br />0 -5° <br />Angle of Draw (9) <br />10 - 20° <br />10 - 20° <br />10 - 20° <br />10 - 20° <br />10 - 20° <br />10 - 20° <br />Maximum tilt and strain parameters apply only to ground surfaces with slopes less that 30 percent; values may be <br />greater on slopes steeper than 30 percent. <br />(l) All panels are numbered according to planned panel identifications. <br />(3) Subsidence and subsidence factor above chain pillars. <br />(4) Subsidence (maximum vertical displacement) above longwall panel centers, based on planned coal extraction <br />thickness listed. <br />(5� Ratio of the range of maximum vertical displacement to overburden depth range for the nine planned longwall <br />