基于塑性区扩展的采动复合顶板巷道围岩变形数值模拟  

Numerical Simulation of Surrounding Rock Deformation of Mining Composite Roof Roadway Based on Plastic Zone Expansion

作　　者：黄聪 王卫军 袁超[1] 肖宇 HUANG Cong;WANG Wei-jun;YUAN Chao;XIAO Yu(School of Resources,Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;Work Safety Key Lab on Prevention and Control of Gas and Roof Disasters for Southern Coal Mines,Hunan University of Science and Technology,Xiangtan 411201,China)

机构地区：[1]湖南科技大学资源环境与安全工程学院,湖南湘潭411201 [2]湖南科技大学南方煤矿瓦斯与顶板灾害预防控制安全生产重点实验室,湖南湘潭411201

出　　处：《煤炭技术》2020年第2期12-15,共4页Coal Technology

基　　金：国家自然科学基金面上项目(51434006,51874130);青年科学基金项目(51804109)。

摘　　要：为了研究采动影响下的复合顶板巷道大幅下沉问题,以江西曲江煤矿212工作面风巷为例,采用现场调查、数值分析等方法,对巷道围岩应力状态,塑性区形成及扩展进行了分析,研究结果表明:受工作面回采期间的采动影响,巷道顶板垂直应力增大,最大主应力方向向着工作面采空区侧发生不同程度的偏转;最大主应力方向导致巷道围岩蝶形塑性区旋转,并且两者的旋转具有高度一致性;当巷道围岩塑性区蝶叶扩展至顶板正上方时,锚索锚固端全部处于塑性区内,使得锚索完全失效,同顶板一同下沉。In order to study the problem of large sinking of composite roof roadway under the influence of mining.Taking the wind lane of 212 working face in Qujiang coal mine of Jiangxi province as an example,the stress state of roadway surrounding rock and the formation and expansion of plastic zone are analyzed by field investigation and numerical analysis.The results show that:Affected by mining during mining,the vertical stress of roadway roof increases,and the maximum principal stress direction has different degree deflection to the goaf side of the working face.The maximum principal stress direction leads to the rotation of the butterfly plastic region of the roadway surrounding rock,and the rotation of the two has a high degree of consistency.When the butterfly leaves in the plastic zone of the surrounding rock of the roadway extend to the top of the roof,all the anchorage ends of the anchor cable are in the plastic zone,which makes the anchor cable completely ineffective and sinks with the roof.

关 键 词：塑性区 锚索失效 主应力方向 破坏机理 

分 类 号：TD322[矿业工程—矿井建设]