Application Research on Core Technology of Downhole Non Coal Pillar Mining
In order to further improve the fully mechanized mining efficiency and coal extraction rate of Longwan Coal Mine,the 2210 working face is taken as the research object,and the roof cutting and pressure relief non coal pillar fully mechanized mining technology is proposed.The blasting roof cutting scheme and the roadway surrounding rock support scheme are studied.The UDEC simulation analysis software is used to analyze the influence under situations of different roof cutting heights and different seam cutting angles on the collapse state of the roof,determine the optimal roof cutting and pressure relief parameters,and propose reinforcement support for the stoping roadway and temporary support technology for the downhole roadway to improve the stability of the roadway during non coal pillar mining.The practical applications show that the greater the roof cutting height,the better the pressure relief effect of the surrounding rock;The change in roof cutting angle is not directly related to roof pressure relief;After adopting the above technology,the deformation amount of the roadway roof decreases by 66.4%,the deformation amount of the two sides of the roadway decreases by 57.1%,and the coal recovery rate increases by 4.6%.
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