摘要
为研究孤立煤体在采空区侧向支承应力、超前支承应力、断层切割形成的地堑结构等因素的耦合作用下诱发冲击地压事故的发生机理,采用现场实测、数值模拟等手段,分析了孤立煤体从形成到发生冲击地压事故期间的应力、塑性区演化过程。研究发现:2305S工作面受相邻采空区侧向支承应力作用,影响范围约210 m,应力峰值55.81 MPa;2305S工作面推采至105 m时超前工作面45 m处应力峰值约为52.23 MPa;工作面推采至250 m时,在工作面前方41 m处应力值达70.96 MPa,应力集中系数达2.90;工作面推采至250 m时“见方”效应显现强烈,使孤立煤体区域应力集中程度加剧;同时2304S工作面采空区也使得楔形地堑区岩层沿高倾角断层面滑移,挤压孤立煤体区域,造成工作面断层三角区煤体应力进一步集中,从而诱发冲击地压。
In order to study the occurrence mechanism of rock burst accidents induced by such coupling factors as lateral support stress,advance support stress and graben structure formed by fault cutting in isolated coal body,the evolution process of stress and plastic zone of the isolated coal body from formation to rock burst accident is analyzed by field measurement and numerical simulation.The results show that the 2305S working face is affected by the lateral support stress of the adjacent goaf area with the affected area of about 210 m and the stress peak value of about 55.81 MPa.When the 2305S working face is pushed to 105 m,the peak value at 45 m ahead of the working face is about 52.23 MPa.When the working face reaches 250 m,the stress peak value at 41 m ahead of the working face reaches 70.96 MPa and the stress concentration coefficient reaches 2.90.When the working face is pushed to 250 m,the“square”effect appears strong,which intensifies the stress concentration in the isolated coal body area.The goaf area of 2304S working face also causes the rock strata in the wedge-shaped graben area to slide along the high-dip fault plane and squeeze the isolated coal body area,which results in further concentration of coal stress in the fault triangle area of the working face,thus inducing rock bursts.
作者
胡昌硕
李东
周法乐
王永
王维斌
张修峰
王存文
陈洋
董春雨
于海峰
文志杰
HU Changshuo;LI Dong;ZHOU Fale;WANG Yong;WANG Weibin;ZHANG Xiufeng;WANG Cunwen;CHEN Yang;DONG Chunyu;YU Haifeng;WEN Zhijie(School of Civil and Resources Engineering,University of Science and Technology Beijing,Beijing 100083,China;School of Safety Engineering,North China Institute of Science and Technology,Langfang,Hebei 065201,China;Shandong Jining Yunhe Coal Company Limited,Jining,Shandong 272055,China;Shandong Lilou Coal Industry Company Limited,Heze,Shandong 274700,China;Shandong Energy Group Company Limited,Jinan,Shandong 250014,China;Jining Mining Industry Group Company Limited Anju Coal,Jining,Shandong 272059,China;College of Energy and Mining Engineering,Shandong University of Science and Technology,Qingdao,Shandong 266590,China)
出处
《山东科技大学学报（自然科学版）》
CAS
北大核心
2022年第5期40-50,共11页
Journal of Shandong University of Science and Technology(Natural Science)
基金
山东省重大科技创新工程项目(2019SDZY02)
廊坊市科学技术研究与发展计划项目(2021013076)。
关键词
冲击地压
数值模拟
孤立煤体
应力集中
“见方”效应
rock burst
numerical simulation
isolated coal body
stress concentration
square effect
