中国矿山工程

In order to study the crustal stress and displacement changes during the rock cross-cut coal uncovering, the corresponding numerical simulation Is carried out with FLAC 3D software. From the perspectives of stress distribution and displacement changes, the coal dynamic response in the process of rock cross-cut coal uncovering is studied and the influence of the crustal stress and displacement changes on the mine gas outburst disaster is analyzed, so as to provide references for similar mines to prevent gas outburst accidents occurrence during the rock cross-cut coal uncovering. The research results show that there is a close relationship between the working face stress concentration and the rock cross-cut excavation distance in the process of rock cross-cut coal uncovering. The stress concentration phenomenon is easy to occur in the two sides of the roadway at 2~8m, and it increases with the decrease of the vertical distance from the coal seam to be uncovered. The stress peak value is 23.83MPa under coal covering and the roadway is seriously deformed and damaged; The rock cross-cut coal uncovering is likely to cause redistribution of stress on the roadway roof and floor, with significantly increased deformation. When the vertical distance from the 3# coal seam is 0~5m, the maximum deformation is 72.22cm, which is easy to cause the roof collapse and bottom bulge, so as to induce coal and gas outburst accidents.