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<br />POWDERHORN COAL C014PANY <br />FIGURE 20-4 <br />STRAIN-SUBSIDENCE-DEPTH RELATIONSHIP <br />• <br />• <br /> <br />s <br />~t <br />5 <br />= 1 <br />0 <br /> <br /> <br /> s6hrE ~ <br /> -- <br />/ - -- - <br /> <br />~ Ezr6hswh <br />/ ~ COh110.E66gN <br />0~0 O~C 66 0~1 1~0 1~7 1~l <br />_Eh <br /> Graph for predicting maximum slope and strain for <br /> various width/depth ratios of panel. <br /> <br />w/h +E -E G <br /> <br />0.24 0.6 S/h 2.2 S/h 2.55 S/h <br />0.3 0.7 S/h 2.0 S/h 2.95 S/h <br />0.5 0.8 S/h 1.35 S/h 3.35 S/h <br />0.8 0.65 S/h 0.7 S/h 2.8 S/h <br />1.4 0.65 S/h 0.51 S/h 2.75 S/h <br />S = Maximum Subsidence <br />h - Depth of Overburden <br />w = Width or Span Across The Panel <br />+E = Maximum Tensile Strain <br />-E = Maximum Compressive Strain <br />G = Maximum Slope Of The Subsidence Trough <br /> <br />