Use of computer numerical simulation, during the Qidong Coal Mine # coal seam under the cover of coal or rock stress distribution, protection layer 8 # coal seam relief distribution studies so as to come under the protection of layer 7 # coal seam # 8 coal seam distribution characteristics of the st

Use of computer simulation methods to Keith, the coal mining, coal #7 by The Coal and rock stress distribution, and the protection level 8 #coal dump distribution, to the next layer of protection during mining coal 7 # 8 #coal, the stress distribution characteristics such as range, pressure relief,

Using the computer value simulation method, to Qidong coal mine 7# coal bed mining, gets down the duplicate coal rock mass stress distribution, is carried on by the protector 8# coal bed release of pressure distribution the research under, thus obtains protector 7# coal bed mining%2

Using computer numerical simulation method, on Qidong coal mine 7# seam mining, Xia review coal rock body stress distribution, was layer 8# seam unloading pressure distribution for research, thus concluded that Xia Layer 7# seam mining during, 8# seam of stress distribution features, unloading press