Development Law of Roof Fissure and Application of Gas Control during Mining in Maijie Coal Mine
To effectively improve the gas control in the working face of soft coal seams,taking No.150508 working face in Maijie Coal Mine as the research background,numerical simulation,theoretical calculation,and on-site application were combined to study the fissure development of surrounding rock and gas control model during the mining of the working face to propose a con-trol model of"high drainage roadway+roof fissure holes+ventilation air methane".We used nu-merical simulation to optimize the construction parameters of roof fissure drilling and high drain-age roadway layout levels and then conducted on-site application research.The results show that the development height of the caving zone and the fissure zone is 16.8 m and 54.5 m,respective-ly;the optimal arrangement layer for high drainage roadway and roof fissure ranges from 16.8 to 35.6 m and from 20 to 40 m,respectively;under the control model of"high drainage roadway+roof fissure hole+ventilation air methane",the average volume fraction of gas in the upper corner is 0.26％and average gas drainage rate in the working face is 64％.The gas control has reached the expected goal,ensuring safe mining.
gas controlfracture zone heighthigh drainage roadway
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