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TABLE 1 <br />MAXIMUM SUBSIDENCE PARAMETERS <br />FROM WEST ELK MINE SUBSIDENCE MONITORING NETWORK <br />Pa <br />LonEtfudlnal Pmft <br />Longitudinal Prafflu <br />Transvorat Praft <br />So. End 1 NW LW <br />No. End 1 NW LW <br />N!LA It 2x3 NW LW <br />W/d <br />750/1240=0.6 <br />750/1350=0.56 <br />2 NW: 750/1000=0.75 <br />3 NW: 750/900=0.83 <br />a.p=S.p/t <br />N/A <br />N/A <br />0.20 to 0.35 <br />a=Sm/t <br />6.94/12=0.58 <br />6.06/11.5=0.53 <br />2 NW: 0.62 <br />3 NW: 0.58 <br />Scold <br />0.005597 <br />0.004489 <br />2 NW: 0.00729 <br />3 NW: 0.00762 <br />Smld2 <br />0.000004514 <br />0.000003325 <br />2 NW: 0.00000729 <br />3 NW: 0.00000847 <br />Mm <br />0.015 <br />0.014 <br />2 NW: 0.014 <br />(2.7•Sm/d) <br />(3.1 •Sm/d) <br />3 NW: 0.021 <br />Cm(1) <br />0.000065 <br />0.000060 <br />2 NW: 0.00022 <br />(14.4•Sm/d2) <br />(18.0•Sm/d2) <br />3 NW: 0.00014 <br />-0.000111 <br />-0.000066 <br />2 NW: -0.00025 <br />(-24.6•Sm/d2) <br />(-19.9•Sm/d2) <br />3 NW: -0.00012 <br />Em <br />0.0070 <br />0.0058 <br />2 NW: 0.0102 <br />(1.25•Sm/d) <br />(1.3•Sm/d) <br />3 NW. 0.0085 <br />-0.0047 <br />-0.0009 <br />2 NW: -0.0236 <br />(-0.8•Sm/d) <br />(-0.2-Sm/d) <br />3 NW: -0.0307 <br />Maximum <br />80 feet <br />100 feet <br />50 feet <br />Crack Depth(2) <br />Break Angle(3) <br />32percent <br />42percent Slope - <br />- <br />Slope - <br />30 Slope in opposite <br />-90 Slope in same <br />Direction to tilt <br />Direction as tilt <br />Angle of <br />17°(4) <br />15°(4) <br />- <br />DraW(3) <br />Notes: <br />(1) Numerical curvature values are in radians per foot (rad/ft). <br />(2) Maximum crack depth is projected for hard, brittle sandstones; depth is expected to be much less, or non- <br />existent, in soft, ductile shales and claystones. <br />(3) Measurement from vertical reference. <br />(4) Measurement takes into account influence of development entries, chain pillars, and prior F -seam mining. <br />