Research on Gas Control Technology of'Hole Instead of Roadway'in Hard Roof Working Face with Low Gas Occurrence
No.2 coal seam in Xuangang mining area of Jinneng Holding Coal Industry Group Co.,Ltd.,has the characteristics of"low gas content,low permeability,high mining intensity,high gas emission,hard roof"and"two low,two high and one hard,"which leads to poor gas pre-drainage effect.In order to solve this problem,taking the basic research of gas parameters as the breakthrough point,the structure and fracture distribution characteristics of mining overburden are explored,the gas distribution characteristics of mining fracture field are studied,and the distribution of pressure relief gas accumulation area is distinguished.Based on this,the gas drainage technology of overburden pressure relief'replacing roadway with hole'is put forward to ensure the safe and efficient production of mine.
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