综放孤岛工作面微震能量分形研究  

Fractal Study of Micro-seismic Energy of Fully Mechanized Caving Island Working Face

作　　者：范鹏宏 聂百胜[2,3,4] FAN Penghong;NIE Baisheng(Department of Mining Engineering,Shanxi Institute of Technology,Shanxi 045000,China;School of Emergency Management and Safety Engineering,China University of Mining&Technology(Beijing),Beijing 100083,China;Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources,China University of Mining and Technology(Beijing),Beijing 100083,China;State Key Laboratory of Coal Resources and Safe Mining,China University of Mining&Technology(Beijing),Beijing 100083,China)

机构地区：[1]山西工程技术学院矿业工程系,山西阳泉045000 [2]中国矿业大学(北京)应急管理与安全工程学院,北京100083 [3]中国矿业大学(北京)共伴生能源精准开采北京市重点实验室,北京100083 [4]中国矿业大学(北京)煤炭资源与安全开采国家重点实验室,北京100083

出　　处：《煤矿安全》2019年第10期29-33,39,共6页Safety in Coal Mines

基　　金：国家重点研发计划资助项目（2016YFC060708-1）;国家自然科学基金资助项目（51374216）

摘　　要：为研究孤岛工作面开采引起的微震活动规律,提高煤岩动力灾害监测预警的时效性,以余吾煤矿N1202综采放顶煤孤岛工作面为工程背景,采用现场微震监测和理论分析的方法,从震源定位、能量、事件数及矩震级等方面,对工作面矿震发展过程的微震活动进行了研究,获得了微震信号的变化规律;引入分形理论,提出了微震活动的能量分形分析方法,验证了采动引起的微震能量分布具有分形特性,揭示了矿震发生过程的能量分形维数变化规律。研究结果显示:在整个监测期间,微震活动能量以中、高能量释放为主;矿震事件主要发生在超前工作面30~70m高应力集中区,靠近运输巷附近的顶底板和煤层中,矩震级为1.05级,能量释放大于10^8J;在矿震发生前的"缺震"阶段,单日累计能量、矩震级、事件数及能量分形维数处于较低值,当单日累计能量、矩震级及分形维数开始增长到矿震当天会达到较高值,能量分形维数值越大,高能量释放的微震事件所占的比例会越多。In order to study the laws of mining-induced micro-seismicity of island working face and prevent the coal rock dynamic disaster,the hypo-central location,energy,micro-seismic event and moment magnitude of micro-seismicity were investigated during the development of mine tremors by means of micro-seismic monitoring in the field and theoretical analysis,with the engineering background of N1202 island mining face of Yuwu Coal Mine.Based on fractal theory,an energy fractal analysis method of micro-seismic activity is proposed to reveal the variation of energy fractal dimension during the process of mine tremors and it is verified that the micro-seismic energy distribution caused by mining has fractal characteristics.The results show that during the whole monitoring period,the micro-seismic activity is dominated by medium and high energy release.The hypo-central location of mine tremors is in the roof,floor and coal seam of high stress concentration area of 30m to 70m in advance of working face,which is close to the haulage gate.The moment magnitude of mine tremors is 1.05Mw and the energy release is more than 10^8 J.In the period of"earthquake deficiency"before mine tremors,the cumulative energy,moment magnitude,number of events and fractal dimension of energy in a day are in a lower value.After the cumulative energy,moment magnitude and fractal dimension began to increase;the higher value would be reached on the day of mine tremors.The larger value of the fractal dimension,the higher proportion of the high energy release events.

关 键 词：综采放顶煤 孤岛工作面 微震信号 矿震 能量分形 

分 类 号：TD324.1[矿业工程—矿井建设]