Abstract:
According to the actual situation of ascending mining in close distance coal seam with hard roof in Xinjiang Qiuci west mine, the cut eye boundary in the lower part of gob and the "hanging structure" of transportation roadway will bring greater safety risks to safety mining at the upward working face. Based on multiple-unit control technology of "floor, coal seam, roof" trinity, the corresponding parameters are determined by adopting the combination of theoretical analysis and numerical simulation method, and the comprehensive prevention and control measures including the combination and optimization methods of roof breaking, seam pressure relief, bottom grouting and filling and working face advancing are presented in this paper. Field application has achieved good results.