中国矿山工程

In view of the dynamic disaster accidents such as roof caving and coal wall spalling in fully mechanized mining face and mining roadway during the mining process of lower coal seam in close distance coal seam. Based on the engineering background of 14101 fully mechanized mining face in close distance coal seam group, this paper studies the roof caving characteristics and weighting law of lower coal seam mining in close distance coal seam group by using UDEC numerical simulation software, and obtains the weighting law of lower coal seam mining roof. The simulation results show that the weighting intensity is low, but the weighting is frequent, which leads to the occurrence of roof disaster accidents. The roof control measures in normal and special periods of working face are put forward. Through the monitoring of roof pressure on site, the roof weighting law is verified, and the corresponding stability control measures are beneficial to the stability control of roof. The research has certain reference value for the roof stability control of similar working face mining.