Micro Seismic Monitioring Location Research Of Coal And Gas Outburst

The frequent occurrence of coal and gas outburst brings huge hazard to coal mine safety, so the research on prediction and forecast of coal and gas out burst is necessary and pressing. The paper adopted the technique of micro seismic monitoring. According to the acoustics information of coal and gas outburst precursor, not only the signal of micro seismic event when it spread in the floor and roof was received, but also the channel wave signal of micro seismic event when it spread in coal seam was collected. The activity law and characteristic of micro seismic before outburst was find out by analysis of micro seismic waveform signal. Seismic source point was oriented effectively by use of time difference of arrival location and direction location, so micro seismic technique can do the effective prediction and forecast in the aspect of coal and gas outburst monitor.The micro seismic location system which was developed in this paper included three parts: signal analysis module, location module and display module. The modules supplemented each other and composed an organic unity. It can do the real-time and effective prediction and forecast to coal and gas outburst, so the performance of safety management work in coal mine is improved. The signal analysis module actualized the collection of first break successfully and carried out the spectrum analysis to waveform by use of Fourier transformation, identified the channel wave. Combined with the field conditions of working face, the location module set up particular coal and gas outburst location model, adopted the method which is combined by least squares and Newton iterated to actualize micro seismic location and carried out the qualitative interpretation to micro seismic by use of the polarization analysis and envelopment. Display module used the powerful data-base management function of SQL Server 2000 and actualized the informationization of data; the multi-direction and multimode display of micro seismic source was actualized by the manner of three-dimension, projection and cutting. It provided important basis to micro seismic location and interpretation work. Finally, Combined with the geology of Lu Xi coal mine, the paper carried on micro seismic observation setting on spot. It was of better effect and feasibility that micro seismic events was analyzed and located through the practice monitoring data.