Study on microseismic events of coal rock rupture during coal roadway driving

Objective In order to monitor and forewarn the danger that may occur in front of the coal mine roadway, Methods the microseismic monitoring technology is used to carry out real-time monitoring of the roadway.Through the data information captured by the monitoring system,the spatial distribution law,the occurrence time,the frequency and the energy key points of the microseismic events under the influence of tunneling are studied,finally,the time-frequency characteristics of typical micro-seismic signals of coal and rock fracture are studied by using the Short-time Fourier transform and s-transform methods. Results The results showed that:（1）The microseismic events are mainly distributed in the area of 50～100 m in front of the heading direction of the roadway,and most of them are medium and low energy microseismic events.Only a few high-intensity coal and rock fracture events occurred in front of the heading face,and the magnitude of micro-earthquake events were mostly distributed at-2～0;（2）There is a positive