开采扰动下底板巷道应力演化规律及围岩稳定性研究  

Study on the Stress Evolution Law of Floor Roadway and Stability of Surrounding Rocks Under Mining Disturbance

作　　者：陆晓东 荣鹏 左宇军[2] 林健云 LU Xiaodong;RONG Peng;ZUO Yujun;LIN Jianyun(Guiyang Vocational and Technical Institute,Guiyang,Guizhou 550023,China;Mining College,Guizhou University,Guiyang,Guizhou 550025,China)

机构地区：[1]贵阳职业技术学院,贵州贵阳550023 [2]贵州大学矿业学院,贵州贵阳550025

出　　处：《矿业研究与开发》2022年第11期102-106,共5页Mining Research and Development

基　　金：国家自然科学基金项目(51964007);贵州省高层次创新型人才培养项目(黔科合人才〔2016〕4011号);贵州省矿山动力灾害预警与控制技术科技创新人才团队项目(黔科合平台人才〔2019〕5619);贵州省科技支撑计划项目(黔科合支撑〔2022〕一般247).

摘　　要：为了研究开采扰动诱发底板瓦斯抽采巷围岩失稳问题,以龙凤煤矿5921底板瓦斯抽采巷为研究对象,采用数值模拟的方法分析了5921工作面开采过程中底板瓦斯抽采巷围岩应力演化过程及围岩变形破坏特征。研究结果表明:垂直应力在巷道跨度范围内随深度增加而增大,巷道位于工作面前方的位置,围岩应力分布特征大致相同,巷道位于采空区的部位,左帮岩体处于卸荷状态,而右帮岩体出现明显的应力集中现象;围岩变形在时空上相较工作面开采有一定的滞后,底板瓦斯抽采巷最大变形位置滞后于回采工作面10~30m,工作面前方10m范围内围岩变形呈增加趋势;底板瓦斯抽采巷位于采空区范围内的部位破坏以拉伸破坏为主,位于煤壁前方支承压力区的部位破坏则以拉伸-剪切组合破坏模式为主,巷道顶板垮落、底鼓的风险较大。In order to study the instability of the surrounding rocks of the floor gas drainage roadway induced by mining disturbance,the 5921floor gas drainage roadway in Longfeng Coal Mine was taken as the research object.The stress evolution of the surrounding rocks in the floor gas drainage roadway during the mining process at the 5921working face was analyzed by numerical simulation,as well as the deformation and destruction characteristics of the surrounding rocks.The research results are concluded as follows.Firstly,the vertical stress increases with the increase of the depth within the span of the roadway.When the roadway is located in the front of the working face,the stress distribution characteristics of the surrounding rocks are roughly the same.When the roadway is located in the goaf,the left side rock mass is in the unloading state,and the right side rock mass has obvious stress concentration.Secondly,the deformation of surrounding rocks lags behind the mining face in time and space.The maximum deformation position of the floor gas drainage roadway lags behind the mining face by about 10-30 m,and the deformation of surrounding rock within 10min front of the working face has an increase trend.Thirdly,the failure of the floor gas drainage roadway located in the goaf is mainly tensile failure,and the failure of the part located in the abutment pressure area in front of the coal wall is mainly tensile-shear combined failure mode,with a high risk of roadway roof collapse and floor heave.

关 键 词：底板巷道 瓦斯抽采 开采扰动 应力演化 围岩稳定性 数值模拟 

分 类 号：TD712[矿业工程—矿井通风与安全]