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Elk Creek Mine Subsidence Paqe 41 <br />February 26, 2003 <br />Table 5. Average stress and predicted surface subsidence over <br />failed Panel Group 1 gateroad pillars. <br />INPUT: Pillar width - 120-ft; pillar height - 9.5-f t; pillar <br /> length - 180-f t; entry and crosscut width - 20-ft; pillars <br /> restrained on cave side; percent gateroad extraction - <br /> 16.9$; overbur den density - 151 PCF <br />Local Average Lm,,, Local <br />Panel Pillar Times Maximum <br />Depth Stress Pillar Surface <br /> Lm„ Ht/Wd Subsid ence <br />(ft) (m) (Mpa) (psi) (MPa) ($) (ft) <br /> <br />210 64 1.81 262 0.14 2.19 0.21 <br />280 85 2.67 388 0.21 2.57 0.24 <br />350 107 3.02 437 0.24 2.72 0.26 <br />400 122 3.45 500 0.27 2.91 0.28 <br />500 152 4.31 625 0.34 3.29 0.31 <br />600 183 5.17 750 0.41 3.67 0.35 <br />700 213 6.03 875 0.48 9.05 0.38 <br />800 244 6.90 1000 0.55 4.43 0.42 <br />900 274 7.76 1125 0.61 9.81 0.46 <br />1000 305 8.62 1250 0.68 5.19 0.99 <br />1100 335 9.48 1375 0.75 5.57 0.53 <br />1200 367 10.34 1500 0.82 5.95 0.56 <br />1300 396 11.20 1625 0.89 6.33 0.61 <br />1400 927 12.07 1750 0.96 6.71 0.64 <br />1500 457 12.93 1875 1.02 7.09 0.67 <br />1600 988 13.79 2000 1.09 7.97 0.71 <br />1700 518 14.65 2125 1.16 7.85 0.75 <br />1800 599 15.52 2250 1.23 8.23 0.78 <br />1900 579 16.38 2375 1.30 8.61 0.82 <br />2000 610 17.24 2500 1.36 8.99 0.85 <br />2100 640 18.10 2625 1.43 9.37 0.89 <br />1 <br />• I <br />•I <br />•i <br />-41- <br />