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<br />n <br />U <br />7C <br />60 <br />L <br />Oi <br />50 <br />rn <br />c <br />c_ <br />~ 40 <br />0 <br />d 30 <br />U <br />c <br />m <br />N <br />~ 20 <br />10 <br />00 <br /> <br /> <br /> <br /> <br /> Subsidence(%)=+8.469+11.951n~1 <br />2 <br /> r <br />=0.949 Syx=4.77% <br />Lmax= K R D=Depth (r <br />R =Extraction Ratio <br /> <br />• <br />I H =Mining Height (m ) <br />W =Pillar Width (m) <br />K = 0.0226MP0/m <br /> <br />20 40 60 80 100 <br />L max ~H/~ <br />figure 9,Subsidence above room-and-pillar workings following pillar <br />squeeze or failure. (Abel & Lee, 1980) <br />-rnox(H/w)~ <br />n) <br />• <br />