Laserfiche WebLink
TABLE 1 <br />• MAXIMUM SUBSIDENCE PARAMETERS <br />FROM WEST ELK MINE SUBSIDENCE. MONITORING NETWORK <br />• <br />Parameter Longitudinal Profile Longitudinal Profile Transverse Profile <br /> So. End 1 NW LW No. End 1 NW LW Above 2,3 NW LW <br />W/d 750/1240=0.6 750/1350=0.56 2 NW: 750/1000=0.75 <br /> 3 NW'. 750!900=0.83 <br />a~ Sw/t N/A N/A 0.20 to 0.35 <br />a=Smlt 6.94/12=0.58 6.06/11.5=0.53 2 NW'. 0.62 <br /> 3 NW: 0.58 <br />S,,,Id 0.005597 0.004489 2 NW: 0.00729 <br /> 3 NW: 0.00762 <br />Sm/d2 0.000004514 0.000003325 2 NW: 0.00000729 <br /> 3 NW: 0.00000847 <br />Mm 0.015 0.014 2 NW: 0.014 <br /> (2.7 Sm/d) (3.1 Smld) 3 NW: 0.021 <br />C ~~~ 0.000065 <br />' 0.000060 2 NW 0.00022 <br />"' (14.4 Sm/d <br />) (18.O~Sm/d') 3 NW: 0.00014 <br /> -0.000111 -0.000066 2 NW: -0.00025 <br /> (-24.6 Sm/d') (-19.9 Sm/d~) 3 NW: -0.00012 <br />Em 0.0070 0.0058 2 NW: 0.0102 <br /> (1.25 Sm/d) (1.3 Sm/d) 3 NW: 0.0085 <br /> -0.0047 -0.0009 2 NW: -0.0236 <br /> (-0.8 Sm/d) (-0.2 Sm/d) 3 NW: -0.0307 <br />Maximum 80 feet 100 feet 50 feet <br />Crack Depth'2' <br />Break Anglet'1 32% Slope - 42% Slope - - <br /> -9° Slope in same 3° Slope in opposite <br /> Direction as tilt Direction to tilt <br />Angle of Draw"' 17°'°' 15°I°' - <br />Notes: <br />(I) 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-existent, in <br />soft, ductile shales and claystones. <br />(3) Meazurement from vertical reference. <br />(4) Meazurement takes into account influence ofdevelopment entries. chain pillars, and prior F-Seam mining. <br />• C:\R31-03?\181ard\Eshibit 60.doc <br />831-032.181 Wright Water Engineers, Inc. <br />