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