Research and Application of Gas Leakage Prevention and Control Technology in Overlying Goaf
In order to effectively prevent and control the invasion of harmful gases in the overlying goaf of the 13103 working face of Shaping Coal Industry,a combination method of theoretical analysis and numerical simulation is used to analyze and study the migration law of harmful gases in the overlying goaf,and a prevention and control technology for harmful gas leakage in the overlying goaf is proposed.The simulation results show that when stoping 50 m,carbon monoxide(CO)in the overlying goaf diffuses from top to bottom towards the working face and the direction of the air intake roadway,and flows into the working face from the middle and rear positions of the working face,accumulating at the return air corner.When stoping 400 m,the range of CO on the open-off cut side increases compared to 50 m,and the accumulation phenomenon of CO in the goaf near the return air corner of the 13103 working face is severe.On this basis,a prevention and control technology for harmful gas leakage in the overlying goaf is proposed by combining the voltage equalization system and coal pillar isolation,and on-site application is carried out.On-site experi-ments show that voltage equalization technology can effectively prevent the leakage of harmful gases and reduce the concentration of harmful gases in the working face.
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