Acoustic-electric response characteristics of coal rock dynamic disasters in driving face
In order to monitor and warn the possible dangers ahead in the process of digging,the acoustic-electric monitoring and warn-ing system was deployed in the driving face,and the dynamic real-time monitoring and warning of the driving roadway was carried out by utilizing the acoustic emission technology and the electromagnetic radiation technology,and the precursor law characteristics before the occurrence of the protrusion danger were obtained through the research of the abnormal acoustic and electric response characteristics in the process of driving and verified in accordance with the actual site conditions.The results show that:during the driving process,the o-verall trend of changes in acoustic emission and electromagnetic radiation intensity shows three stages.When the danger of coal and gas outburst occurs,the acoustic-electric intensity parameters respond violently,showing a clear trend of acoustic increase and power de-crease.The intensity of acoustic emission and electromagnetic radiation is significantly correlated with gas concentration,and the sudden increase in gas concentration and abnormal acoustic-electric signals basically occur synchronously.Acoustic-electric gas can reflect the changes in the dynamic evolution process of coal and rock,and the first abnormal fluctuation of acoustic-electric can be set as the start time of gas warning precursor,with an advance warning of about 8 hours.It can be seen that by studying the abnormal response of acous-tic-electricity-gas,the early warning prediction of coal and gas protrusion can be realized.
driving faceacoustic-electric monitoring and warning systemacoustic-electric response characteristicsacoustic-electric-gas
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