近直立煤层冲击地压微震监测前兆信息规律研究  

Study on Precursors of Rockburst in the Mining of a Near-vertical Coal Seam Based on Microseismic Monitoring

作　　者：赵志鹏 闫瑞兵 刘昆轮 ZHAO Zhi-peng;YAN Rui-bing;LIU Kun-lun(Shenhua Xinjiang Energy Co.,Ltd.,Urumqi 830027,China)

机构地区：[1]神华新疆能源有限责任公司,新疆乌鲁木齐830027

出　　处：《煤炭工程》2019年第11期97-100,共4页Coal Engineering

基　　金：国家重点研发计划项目(2017YFC0804205);国家自然科学基金项目(51874231,51504184).

摘　　要：以乌东煤矿近直立煤层+450水平B3+6综放面为工程背景,对冲击地压发生前的微震事件时空演化规律展开研究,旨在识别近直立煤层冲击地压前兆信息,建立了反映煤岩体能量释放异常程度的微震能量和频次偏差值指标,分析了冲击地压发生前微震能量、频次、偏差值及空间分布的演化规律。结果表明:冲击地压发生前,每日微震累计能量会剧烈波动并下降到一个较低值,微震频次则出现急升急降的变化,微震能量偏差值往往出现较高值,该值一般大于20,微震频次偏差值会经历一个峰值,该峰值大于0.8;微震事件在空间上向回采工作面集中,且大能量事件增多。研究结果对B3+6综放面及类似近直立煤层的冲击地压监测预警具有一定的借鉴意义。Based on the engineering background of the+450 horizontal No.B3+6 fully mechanized top-coal caving face in the near-vertical coal seam of Wudong Coal Mine,the spatio-temporal evolution of microseismic events before the occurrence of rockburst was studied aiming at identifing the precursory information of rockburst.The deviation index of microseismic energy and frequency reflecting the degree of energy release anomaly of coal and rock was established.The evolution law of microseismic energy,frequency,deviation index and spatial distribution before rockburst were analyzed.The results show that before the occurrence of rockburst,the daily total energy of microseismicity fluctuates sharply and drops to a low value.The daily event count of microseismicity rises and falls sharply.The deviation index of microseismic energy tends to appear higher,and this value is generally greater than 20.The deviation index of daily event count of microseismicity experiences a peak value,which is greater than 0.8.Microseismic events are spatially concentrated toward the mining face,and the number of microseismic event with high energy increases.The results provide reference for the monitoring and early warning of rockburst in No.B3+6 fully mechanized top-coal caving face and other coal seams with similar mining and geological conditions.

关 键 词：近直立煤层 冲击地压 微震监测 时空演化 

分 类 号：TD324[矿业工程—矿井建设] P631.4[天文地球—地质矿产勘探]