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Elk Creek Mine Subsidence Page 43 February 26, 2003 <br />Table 7. Average stress and predicted surface subsidence over <br />failed Panel Group 3 gateroad pillars. <br />INPUT: Pillar width - 80-ft; pillar height - 9.5-ft; pillar length <br />- 180-f t; entry and crosscut width - 20-ft; pillars <br />retrained on cave side; percent gateroad extraction - <br />20.0~; overburden density - 151 PCF <br />Local Average L,,,ax Local <br />Panel Pillar Times Maximum <br />Depth Stress Pillar Sur face <br /> Lm,x Ht/Wd Subsidence <br />(ft) (m) (Mpa) (psi) (MPa) S ~) (ft) <br /> <br />600 183 5.37 779 0.64 4.94 0.47 <br />700 213 6.27 909 0.74 5.54 0.53 <br />800 244 7.16 1039 0.85 6.13 0.58 <br />900 274 8.06 1168 0.96 6.72 0.64 <br />1000 305 8.95 1298 1.06 7.31 0.70 <br />1100 335 9.85 1428 1.17 7.90 0.75 <br />1200 367 10.74 1558 1.28 8.50 0.81 <br />1300 396 11.64 1688 1.38 9.09 0.86 <br />1400 927 12.54 1818 1.49 9.68 0.92 <br />1500 457 13.43 1997 1.60 10.27 0.98 <br />1600 488 14.33 2077 1.70 10.86 1.03 <br />1700 518 15.22 2207 1.81 11.46 1.09 <br />1800 549 16.12 2337 1.91 12.05 1.14 <br />1900 579 17.01 2967 2.02 12.64 1.20 <br />2000 610 17.91 2597 2.13 13.23 1.26 <br />2100 690 18.80 2726 2.23 13.83 1.31 <br />2200 671 19.70 2856 2.34 14.42 1.37 <br />-43- <br />• I_ <br />I <br />•i_ <br />^ <br />•' <br />C <br />