不规则煤柱变形破坏机理矩张量反演研究  

Moment tensor inversion study on deformation and failure mechanism of the irregular coal pillar

作　　者：刘洋[1] 陆菜平[1] 王华[1] 郭英 肖自义 夏磊 王超 LIU Yang;LU Caiping;WANG Hua;GUO Ying;XIAO Ziyi;XIA Lei;WANG Chao(School of Mines,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;Baodian Coal Mine,Yankuang Energy Group Company Limited,Zoucheng,Shandong g273513,China;Shandong Bureau of the National Mine Safety Administration,Jining,Shandong g272155,China;Centre of Rockburst Prevention Research,Yankuang Energy Group Company Limited,Zoucheng,Shandong 273500,China)

机构地区：[1]中国矿业大学矿业工程学院,江苏徐州221116 [2]兖矿能源集团股份有限公司鲍店煤矿,山东邹城273513 [3]国家矿山安全监察局山东局,山东济宁272155 [4]兖矿能源集团股份有限公司冲击地压防治研究中心,山东邹城273500

出　　处：《采矿与安全工程学报》2023年第6期1201-1209,共9页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(52104102);中央高校基本科研业务费项目(2021QN1001)。

摘　　要：为探究不规则煤柱变形破坏机理,为采场煤柱失稳型动力灾害防治提供理论参考,基于不规则煤柱区微震监测数据,利用矩张量反演、应力场反演及波速层析等方法,研究不规则煤柱破裂类型、震源机制、主控因素、应力分布及变形破坏特征,并由此提出不规则煤柱变形破坏机理。结果表明:不规则停采煤柱胶带巷侧发生压缩破坏,辅运巷侧主要表现为拉伸破坏;区域震源机制为左旋斜滑正断层,推断真实断层面为走向214°、倾角55°、滑动角-145°;煤柱变形破坏主要受最大主应力σ1控制,相邻矿井采空区侧向压力是煤柱破坏的主导因素;在最大主应力σ1主控作用下,煤柱发生压缩破坏,并造成应力集中及煤岩体变形破坏向煤柱内部转移。In order to explore the deformation and failure mechanism of the irregular coal pillar and provide a theoretical reference for the prevention and control of dynamic disasters caused by coal pillar instability in the stope,the fracture type,focal mechanism,main controlling factor,stress distribution,and deformation and failure characteristic of the pillar were analysed based on microseismic(MS)monitoring in irregular coal pillar area,by moment tensor inversion,stress field inversion and wave velocity tomography,and the deformation and failure mechanism of the pillar was proposed. The results show that the irregular end-mining pillar undergoes compression failure near the headentry,while it mainly exhibits tensile failure near the tailentry. The regional focal mechanism is a sinistral oblique slip normal fault,and it is inferred that the true fault plane has a strike of214°,inclination of55°,and sliding angle of-145°. The deformation and failure of the pillar is mainly controlled by the maximum principal stress σ1,and the lateral pressure of the adjacent goaf is the dominant factor for the failure of the pillar. Under the main control of the maximum principal stress σ1,the pillar undergoes compression failure,causing stress concentration and deformation and failure of the coal/rock to transfer to the interior of the pillar.

关 键 词：不规则煤柱 矩张量反演 震源机制 主控因素 应力分布 

分 类 号：TD324[矿业工程—矿井建设]