Analysis on Re-mining Values of Coal Mining Face in Seam Failure Zone

Within Fenxi Mining Area,due to the coal mining method applied to the small mine was the backward excavating as a mining or the room and pillar coal mining technology,the small mine with the random mining left large areas of the seam failure zones,the resource mining rate of the small mines was ultra lower and the serious safety problems occurred to the mine production.Based on Xinliu Mine with the serious failures by the small mines as an engineering background,a geological model of No.0902 coal mining face in the South Wing of Jiaozili Mining Block was established.The paper analyzed the distribution law of the stress fields formed by the room and pillar coal mining in the small mine.Based on the circumstances,the paper discussed the stress variation law of the failure zone before the coal mining face passed through when a high ranking conventional mining method or a fully mechanized coal mining method was applied.Meanwhile the paper studied the rational aligned inclination angle when the coal mining face passed through the failure zone.The results showed that during the inclination alignment process,the face end of the conveyor gateway should be about 20m in advance of the face end of the material transportation gateway and the inclined advancing forward of the coal mining face could make the coal pillars in front of the coal mining face alternatively in stress concentration.The study of the paper would have the scientific significances and the engineering guidance value to the coal resource integration and the mine safety mining.