李雅庄煤矿微震信号类别及微震事件时空分析

Category of Microseismic Signals and Time-space Analysis of Microseismic Event in Liyazhuang Coal Mine

为了能够给煤矿冲击地压危险性的预测预报提供理论依据,采用SOS微震监测系统对李雅庄煤矿2-610工作面附近煤岩体进行为期2个月的微震信号监测,综合微震信号能量、震中位置及震源垂直标高等信息分析了工作面微震信号类别,并深入研究了微震事件的时空分布规律。结果表明:2-610工作面断层活化的微震信号能量级别为10^5 J,主频为30~55 Hz;采空区基本顶断裂及开切眼处顶板破裂的微震信号能量级别均为10^4 J,主频前者为25~35 Hz,后者为45~70 Hz;采空区直接顶垮落的微震信号能量级别为10^3 J,主频为25~45 Hz。在确定的生产空间中微震事件主要集中在位置变化不大的3个区域;微震频次主要受生产时间的影响,其随交接班后正常生产时间的增加有一个逐渐增加的过程,且存在一定的滞后。

In order to provide a theoretical basis for predicting the risk of rockburst,SOS microseismic monitoring system was used to monitor the microseismic signal of coal and rock mass near 2-610 working face in Liyazhuang Coal Mine for two months.Based on the information of microseismic signal energy,epicenter location and vertical elevation of the source comprehensively,the types of microseismic signal on working face were analyzed,the temporal and spatial distribution of microseismic events were also studied.The results show that the energy level of fault activation microseismic signal of the 2-610 working face is 10^5 J,and the main frequency is from 30 Hz to 55 Hz;the energy level of microseismic signals of basic roof fracture in goaf and roof fracture at open-off cuts is 10^4 J,the former main frequency is from 25 Hz to 35 Hz,the latter is from 45 Hz to 70 Hz;the energy level of the microseismic signal of immediate roof caving in goaf is 10^3 J,and the main frequency is from 25 Hz to 45 Hz,microseismic events mainly focus on three regions in which position have little change in the determined production space;microseismic frequency is mainly influenced by production time,and increases gradually with the increase of production time after change shifts,and there is a certain lag time.