Research on acoustic-electric characteristics of different work processes in coal mine driving process
In order to monitor and warn the coal-rock power disaster in front of the working face of the driving process,based on the a-coustic-electric monitoring and warning system,real-time monitoring of equipment migration,drilling technology,roof hydraulic fracturing and other operational processes in the driving process of Wuyang Coal Mine was carried out to explore the acoustic-electric response law in different operational processes,and the acoustic-electric response characteristics under different driving speeds were investigated,and finally the acoustic-electricity-gas exceeding the limit comprehensive early warning model was proposed.The results showed that the in-terference signals of acoustic-electrical intensity during roadway driving were mainly tip-type pulses and n-type,and the acousti-electric response characteristics are different in different operation processes.There were differences in acoustic emission and electromagnetic ra-diation intensity during equipment relocation,regional drilling operation,and hydraulic fracturing of the roof,and the acoustic emission surge rates were 300％,300％,and 500％,respectively,and the electromagnetic radiation intensity surge rates were-120％,900％,and 100％,respectively.The acoustic emission,electromagnetic radiation intensity and the change of driving speed had obvious correspon-dence,and the three ones show good positive correlation.The acoustic-electrical-gas exceeding the limit comprehensive early warning model was proposed,and the accuracy of the warning model reached 90％,and the false alarm rate was reduced to 10％,improving the real-time warning and accuracy.The research results can provide reference significance for the prevention and control,prediction and early warning of coal-rock dynamic disasters in the driving face.
acoustic-electric monitoring and early warningdifferent work processesdriving speedacoustic-electric response character-isticscomprehensive early warning
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