| Rock burst is one of the main hazards faced by deep mine. With the increase of miningdepth and mining intension, strength and frequency of rock burst are on the rise, and has becomea serious threaten to mine safety and efficient production. Comprehensive monitoring of rockburst hazard can further improve the accuracy of rock burst hazard warning，it has greattheoretical and practical significance for the safety production of coal mines.Combining the geological condition and mining circumstance of Qianqiu coal mine, therock burst characteristic and its influence factor are studied in this paper. Working face inQianqiu coal mine were monitored and analyzed by combining electromagnetic radiation(KBD5、KBD7) with microseismic (ARAMIS-ME、ESG), and the inherent relationship betweenthe precusor rule of EMR and MS and rock burst risk is obtained; the rock burst warningindicator is determined, warning threshold based on critical value and dynamic changing rate isestablished, and the initial rock burst comprehensive monitoring and warning system of Qianqiucoal mine is built and applied. The main research results are as follows:(1) The major mining area of Qianqiu coal mine has strong rock burst hazard. Physical andmechanical properties of coal and rock, geological structure, mining depth, seam thickness andmining activities etc. collectively result in the rock burst.(2) Before the rock burst, KBD5signals change from gradual increase to decrease in time,and the EMR intensity and pulse are higher in rock burst area than other places in space. KBD7has three kinds of trend:"inverted V" type,"N" type and "Continuous rise" type, their proportionare57.14%，28.57%，14.29%respectively; the monitoring laws of the two microseismic(ARAMIS-ME、ESG) types are the same: The daily total energy and daily frequency showgradually decreasing tendency before rock burst, which means the "quiet period" before rockburst.(3) The sensitive index of rock burst warning in Qianqiu coal mine is studied anddetermined, the warning threshold and the dynamic changing rate criterion of rock burst areestablished based on the mutation theory. By comprehensive warning quantification, a suitablecomprehensive warning system is formed and applied in Qianqiu coal mine successfully. |
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