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DEFINITION OF SYMBOLS <br />Symbol Definition Dimensions <br />S <br />Vertical Displacement (Subsidence) <br />L <br />Sm <br />Maximum Vertical Displacement (Sm a•t) <br />L <br />S/Sm <br />Ratio of Vertical Displacement to <br />L/L <br />Maximum Vertical Displacement <br />Sn <br />Horizontal Displacement <br />L <br />t <br />Coal Extraction Thickness <br />L <br />a = (Sm/t) <br />Subsidence Factor <br />L/L <br />app <br />Subsidence Factor Above Chain Pillars <br />L/L <br />Sip acp.t <br />Maximum Subsidence Above Chain Pillars <br />L <br />d <br />Overburden Depth <br />L <br />Sm/d <br />Ratio of maximum vertical displacement <br />to overburden depth <br />L/L <br />Wcr <br />Critical Extraction Width <br />L/L <br />W/d <br />Mining Width to Overburden Depth Ratio <br />L/L <br />M <br />Tilt (Slope) <br />L/L <br />Mm <br />Maximum Tilt <br />L/L <br />C <br />Curvature, the reciprocal of <br />Radius of Curvature <br />rad/L (1/L,) <br />Cm <br />Maximum Curvature <br />rad/L (1/L) <br />E <br />Horizontal Strain <br />(+) is Positive, (-) is Negative <br />L/L <br />Em <br />Maximum Horizontal Strain <br />L/L <br />Angle of Draw <br />Degrees <br />B <br />Break Angle <br />Degrees <br />R <br />Angle of Major Influence <br />Degrees <br />r <br />Radius of Major Influence <br />L <br />IN <br />