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<br />Initial Ground Final Ground Percent Increase in Tensile and Decrease <br />Slope Slope in Compressive Predicted Maximum Strains <br />10° 11° 0.3% <br />15° 16° 0.5% <br />20° 21° 0,7% <br />30° 31° 1, pry, <br />40° 41° 1.57. <br />Therefore, the slope strain correction has been neglected. <br />The maximum mining height in the area under consideration will not exceed <br />8 ft. The longwall panel width is to be 640 ft, involving the 600-ft long- <br />wall face plus the 20-ft gateroads at either end. The depth range is from <br />1200 to 2400 ft. <br />The mining plan calls for yielding gateroad pillars be~~enorl:o~ a~L~.< <br />• pa~~y~e .."-fie gateroad pillars are designed to crush when the panels on both <br />sides have been extracted, The~fri~~rst+-r„honewa±ldL.,panel~dn~.eue~yseries~..ofi~- <br />adjae~eri~tltpane2s ~+ai1~J:--function. as_ though_,it_werebounded by-rigid ga-geroad <br />pillars until the second panel is extracted. <br />The panel width/depth relationships: <br />W 640 W 640 <br /> <br />D _ <br />= 0,533 at 1200 ft <br />1200 <br />D = <br />= 0.400 at 1600 ft <br />1600 <br /> <br />D 2400 - 0,267 at 2400 ft D 2000 - 0.320 at 2000 ft <br />W 640 <br />_ = 0.427 at 1500 ft <br />D 1500 <br />are such that the predicted maximum compressive strain will occur over the <br />center of the first longwall panel of every series of adjacent panels, from 4090.}{ <br />at 1200-ft depth to 1110 Nf at 2400-ft depth, The predicted maximum compressive <br />• strain at 1200-ft depth will decrease to 2750~yE over that and all other longwall <br />panels in that series when the second panel is extracted. However, the pre- <br />