摘要
冲击地压发生的根源是围岩支承压力分布规律的改变,以郓城煤矿1301工作面为工程背景,为研究冲击区域受采动影响较小的情况下,冲击发生的根源,采用理论分析、现场检测、工程试验等方法研究水仓围岩应力的分布规律及岩性的改变,研究内容为:(1)新型冲击地压类型“静压冲击”,以及“静压冲击”发生的机制;(2)水仓围岩应力的分布规律;(3)通过煤岩体浸水试验揭示水仓周围煤岩体浸水一个月岩性发生的变化。从而揭示了郓城煤矿1301工作面“1·8”事故演化的过程:水仓煤柱失效,顶板由“θ”型结构向“O”型结构转变,水仓围岩应力重新分布,再加上煤岩体浸水导致煤岩体岩性特别是煤岩体的单轴抗压强度由原来的16.7MPa降低为10.63MPa,进而得出郓城煤矿1301工作面“1·8”事故发生的根源,该方法对于类似条件工作面的防冲具有重要的参考意义。
The cause of rockbursts is associated with the variation of the abutment pressure in surrounding rocks. Based on the case of the LW1301 in Yuncheng Coal Mine,this paper aims to explore the mechanism of the rockburst occurrence under a specific condition of little mining influence. Theoretical analysis,field monitoring,and an engineering test were used to investigate the stress distribution characteristics in the surrounding rocks of a water sump,and their property change. The research work involves:(1) a new rockburst type of static-stress rockburst and its occurrence mechanism.(2) Stress distribution characteristics in the surrounding rocks of the water sump,and(3) the change of the rock and coal property around the water sump through a water immersion test for a month. The study reveals that the rockburst event occurred in the LW1301 in Yuncheng Coal Mine on January 8 is induced by the failure of the weakened coal pillar in the water sump,leading to the transformation of the roof structure and the stress redistribution in the surrounding rocks. The results of this work can provide a reference for rockburst preventions of other longwall panels with similar conditions.
作者
李东
姜福兴
王存文
田昭军
王永
刘金海
LI Dong;JIANG Fuxing;WANG Cunwen;TIAN Zhaojun;WANG Yong;LIU Jinhai(School of Civil and Environmental Engineering,University of Science and Technology Beijing,Beijing 100083,China;Yuncheng Coal Mine,Heze,Shandong 274700,China;Safety Engineering College,North China Institute of Science and Technology,Beijing 101601,China)
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2018年第A02期4038-4046,共9页
Chinese Journal of Rock Mechanics and Engineering
基金
国家重点研发计划资助项目(2016YFC0801408)
国家自然科学基金资助项目(51674014)
国家自然科学基金重点资助项目(51634001)~~
关键词
采矿工程
冲击地压
支承压力
静压冲击
顶板结构
浸水试验
mining engineering
rockburst
abutment pressure
static-stress rockburst
roof structure
immersionwater test
