Research On Coal Mine Micro-seismic Monitoring And Rock Burst Warning

Coal is one of the main energy resources in China.The production of coal increases and the mining depth deepens year by year with the increasing need of coal.Thus,coal mine disasters and accidents such as rock burst happen frequently due to mining activities.Rock burst happens suddenly,it demages facilities and blocks the production,causes casualties and impacts coal mine safety seriously.The coverage area of micro-seismic monitoring is large,it can realize three-dimensional,dynamic current time monitoring of an entire mine area and the continuous monitoring of a coal mine in time and space compared to traditional rock burst warning methods such as drilling cuttings method and electromagnetic radiation method,now,micro-seismic monitoring is becoming one of the most promising rock burst warning methods,scholars in related fields have done multi-disciplinary and multi-level research on micro-seismic monitoring.However,rock burst micro-seismic monitoring is still in exploration and promotion stage,its actual application experience is still insufficient,the study of the relativity between rock burst and micro-seismic activities is not enough at all,there is still no reliable criterion of rock burst micro-seismic monitoring warning.Zhang Shuanglou coal mine in Jiangsu and Peng Zhuang coal mine in Shandong are both suffered from rock burst disasters frequently,they both have installed KJ20 micro-seismic monitoring system.This paper sets to study the relativity between rock burst and micro-seismic activities based on the mine micro-seismic monitoring data recorded by KJ20 micro-seismic monitoring system combined with the practical geological conditions and engineering activity of Zhang Shuanglou coal mine and Peng Zhuang coal mine,and this paper trys to establish the criterion between micro-seismic activities and rock burst warning.The following work has been mainly developed focusing the aim of this paper:(1)The effects of coal mining on micro-seismic activities in Zhang Shuanglou coal mine.(2)The law of micro-seismic activities while mining activities going through the fault.(3)The law of micro-seismic activities during the period of floor rising.Through the study,we found that mining activities are the main factor of micro-seismic,micro-seismic activities focus near the working face and are positive correlated with mining progress in general.The micro-seismic activities increase while mining activities going through the fault,the frequency spectrum of the seismic wave is closely related to the propagation medium.There are often larger micro-seismics before a rock burst,the quantity and intensity of the micro-seismic activities tend to"rise-fall-rise again",that provides the basis for establishing the criterion between micro-seismic activities and rock burst warning.