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"D" Seam Longwall Subsidence Page 38 August 17, 1998 <br />Table 7. Average gateroad stresses and surface subsidence <br />• predictions over crushed gateroad pillars between longwall panels. <br />Local Gateroad Local Average Local <br />Panel Area Percent Pillar Maximum <br />Depth Support Extraction Stress Surface <br /> Width Lm,x Subsidence <br />(ft) (m) (ft) (MPa) (~) (ft) <br />500 152 790 91~ 39.9 31.3 2.66 <br /> 5780psi <br />1000 305 740 91$ 79.7 39.6 3.37 <br /> 11560psi <br />1500 457 790 91B 119.6 94.4 3.78 <br /> 17390psi <br />2000 610 790 91$ 159.5 97.9 9.07 <br /> 23120psi <br />2500 762 740 91$ 199.3 50.6 9.30 <br /> 28900psi <br />C <br />• <br />38 <br />