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• <br />DEFINITION OF SYMBOLS <br />Symbol <br />Definition <br />Dimensions <br />S <br />Vertical Displacement (Subsidence) <br />L <br />S,,, <br />Maximum Vertical Displacement (Sm a•t) <br />L <br />S /S <br />Ratio of Vertical Displacement to <br />L/L <br />Maximum Vertical Displacement <br />S h <br />Horizontal Displacement <br />L <br />t <br />Coal Extraction Thickness <br />L <br />a = (S /t) <br />Subsidence Factor <br />L/L <br />app <br />Subsidence Factor Above Chain Pillars <br />L/L <br />SCP= app t <br />Maximum Subsidence Above Chain Pillars <br />L <br />d <br />Overburden Depth <br />L <br />S r „ / <br />Ratio of maximum vertical displacement <br />to overburden depth <br />L/L <br />• WCr <br />Critical Extraction Width <br />L/L <br />L/L <br />W/d <br />Mining Width to Overburden Depth Ratio <br />M <br />Tilt (Slope) <br />L/L <br />M m <br />Maximum Tilt <br />L/L <br />C <br />Curvature, the reciprocal of <br />Radius of Curvature <br />rad /L (1 /L) <br />C m <br />Maximum Curvature <br />rad /L (1 /L) <br />E <br />Horizontal Strain <br />( +) is Positive, ( -) is Negative <br />L/L <br />E m <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 />iv <br />