Application of Carbon Dioxide Induced Cracking Technology in 212 Transport of Rock Cross-cut Uncovering in Jinjia Coal Mine

In view of problems such as large quantity,high cost and long gas extraction time of 212 transport of rock cross-cut uncovering in Jinjia Coal Mine,with the method of field test and theoretical analysis,the perforation pattern and governance of rock cross-cut uncovering gas extraction in Jinjia Coal Mine were optimized.The research results show that the elastic potential of the coal is effectively released after the CO₂ cracking technology is implemented in the process of 212 transport of rock cross- cut uncovering in Jinjia Coal Mine,and the stress of coal and gas outburst is effectively eliminated;the effective radius of crack is increased to 6 m,and the time of rock cross-cut uncovering is shortened to 75 d,realizing the goal of safe and efficient mining of tunneling face.