一侧采空间隔煤柱采场回采时冲击地压发生机理研究  

Mechanism of rock burst during stope mining with interval coal pillar in one-sided mining space

作　　者：李东 史先锋 赵丞 盖德成 陈洋 董春雨 姜福兴[3] 文志杰[4] LI Dong;SHI Xianfeng;ZHAO Cheng;GE Decheng;CHEN Yang;DONG Chunyu;JIANG Fuxing;WEN Zhijie(School of Safety Engineering,North China Institute of Science and Technology,Langfang,Hebei 065201,China;China Academy of Safety Science and Technology,Beijing 100029,China;School of Civil and Environ Mental Engineering,University of Science and Technology Beijing,Beijing 100083,China;College of Energy and Mining Engineering,Shandong University of Science and Technology,Qingdao,Shandong 266590,China)

机构地区：[1]华北科技学院安全工程学院,河北廊坊065201 [2]中国安全生产科学研究院,北京100029 [3]北京科技大学土木与环境工程学院,北京100083 [4]山东科技大学能源与矿业学院,山东青岛266590

出　　处：《采矿与安全工程学报》2020年第6期1213-1221,共9页Journal of Mining & Safety Engineering

基　　金：山东省重大科技创新工程项目(2019SDZY02)。

摘　　要：针对山东某矿两工作面之间间隔大煤柱先后回采时发生的重大冲击地压事故,本文采用理论分析、现场监测等方法研究了煤柱一侧工作面回采完毕,煤柱另一侧工作面回采时,诱发冲击地压的机理,得到以下主要结论:揭示了采场及煤柱区域急剧变化的褶曲构造在形成的过程中,受到来自水平方向的挤压作用,在水平方向上积聚了大量的弹性应变能;由于采场受到间隔80 m煤柱的采空区影响,采场“见方效应”提前显现,采场周边出现应力异常现象;工作面、两平巷和断层将工作面前方煤体切割为孤立煤体,定性分析了孤立煤体随工作面的不断推进应力逐渐增大,“孤岛”效应显现强烈;建立了煤柱两侧采空区上覆岩层对煤柱加载的理论计算模型,并对煤柱整体冲击危险性进行了判定。In view of a major rock burst accident that occurred in large interval coal pillars in two working faces of successive stope mining in Shandong Province,through theoretical analysis and field monitoring,the mechanism of rock burst inducement was studied when working face on one side of the coal pillar is finished and the working face on the other side is at extraction.The main conclusions are as follows:During the formation of the convoluted structure that changes drastically in the stope and coal pillar area,a large amount of elastic strain energy is accumulated in the horizontal direction because of the compression from the same direction.As affected by the goaf with coal pillars of 80m in tervals, the stope has “square effect” in advance, and the abnormal stress occurs around the field. The coal body in front of the working face is cut into isolated coal bodies by the working face, two straighttroughs and faults. It is qualitatively analyzed that the stress of the isolated coal body gradually increases with the continuous propulsion of the working face with an intense display of “islanding effect”. Atheoretical loading calculation model of overlying rock layers on both sides of the coal pillars has been established and the overall rock burst hazard on coal pillars has been determined.

关 键 词：煤柱 覆岩空间结构 支承压力 整体失稳 冲击危险性 

分 类 号：TD325[矿业工程—矿井建设]