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JI <br />~- <br />~~~: <br />~ (., <br />~, <br />~.: <br />1~ <br />r, <br />~_, <br />~, <br />~: <br />i. <br />Sanborn Creek Subsidence Page 30 September 2, 1997 <br />Figure 7. Prediction of supercritical room-and-pillar subsidence <br />(Abel 6 Lee, 1984). <br />70 <br />so <br />s <br />so <br />G <br />.~ <br />~ 40 <br />0 <br />~ 30 <br />G <br />T7 <br />N <br />20 <br />10 <br />N~, <br />00 20 40 60 80 100 <br />Lm~(HNV1 <br />Subsidence over super-critical room-and-pillar <br />workings following pillar failure. <br /> <br /> <br /> <br /> <br /> Su bsid ence(%)=+8.469+11.95 tn~L~(~ <br />2 <br /> r <br />=0.949 Syx=.4.77% <br />Lam= K R D=Depth (m) <br />R =Extraction Ratio <br /> <br />• H =Mining Height (m ) <br />W=Pillar Width(m) <br />K = 0.0226MP°/m <br /> <br />30 <br />