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DEFINITION OF SYMBOLS <br /> Symbol Definition Dimensions <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 /> Sn Horizontal Displacement L <br /> t Coal Extraction Thickness L <br /> a=(Sm/t) Subsidence Factor L/L <br /> asp Subsidence Factor Above Chain Pillars L/L <br /> Sip 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 /> Er„ Maximum Horizontal Strain L/L <br /> Angle of Draw Degrees <br /> B Break Angle Degrees <br /> R Angle of Major Influence Degrees <br /> r Radius of Major Influence L <br /> iv <br />