开挖卸荷扰动深部巷道围岩变形破坏特征研究  

Study on deformation and failure characteristics of deep roadway surrounding rock under excavation unloading disturbance

作　　者：王新丰 何毅[3] 陆明远[1] 高毓浩 李珊 WANG Xinfeng;HE Yi;LU Mingyuan;GAO Yuhao;LI Shan(College of Environment and Resources,Xiangtan University,Xiangtan Hunan 411105,China;Hunan Key Laboratory for Geomechanics and Engineering Safety,College of Civil Engineering and Mechanics,Xiangtan University,Xiangtan Hunan 411105,China;College of Resource and Safety,Chongqing University,Chongqing 400044,China)

机构地区：[1]湘潭大学环境与资源学院,湖南湘潭411105 [2]湘潭大学岩土力学与工程安全湖南省重点实验室,湖南湘潭411105 [3]重庆大学资源与安全学院,重庆400044

出　　处：《中国安全科学学报》2021年第8期83-90,共8页China Safety Science Journal

基　　金：国家自然科学基金资助(51904266);煤矿安全高效开采省部共建教育部重点实验室开放基金资助(JYBSYS2018203);湖湘高层次人才聚集工程创新团队项目(2019RS1059)。

摘　　要：为解决开挖卸荷工程扰动条件下深部巷道围岩失稳变形加剧与受力破坏严重问题,采用层次分析(AHP)、数理计算与数值模拟的综合研究方法,分析卸荷扰动作用下深部巷道围岩的典型形变特点;建立围岩失稳破坏的综合评价体系,得出围岩裂隙场、应力场与位移场的时空演化特征。研究结果表明:深部开挖扰动围岩具有内部卸荷失稳、外部非线性变形的双重典型形变特征;围岩垂直应力与水平应力的耦合作用引发围岩的变形破坏;深部开挖巷道围岩具有初期形变量大、位移变化速度快、流变性强的特点,顶板下沉和底板鼓起是围岩失稳变形的显著特征。In order to solve problem of surrounding rock instability,deformation and stress failure of deep roadway under disturbance of excavation unloading engineering. Typical deformation characteristics of deep roadway surrounding rock under unloading disturbance were analyzed by adopted analytic hierarchy process( HAP),mathematical calculation and numerical simulation,comprehensive evaluation system of surrounding rock instability was established, as well as space-time evolutionary characteristics of surrounding rock fracture field,stress field and displacement field were obtained. The results show that surrounding rock disturbed by deep excavation has double typical deformation characteristics of internal unloading instability and external nonlinear deformation. Coupling effect of vertical stress and horizontal stress causes deformation and failure of surrounding rock. Surrounding rock of deep excavation roadway has characteristics of large initial deformation,rapid displacement change and strong rheology. Roof subsidence and floor heave are significant characteristics of surrounding rock instability and deformation.

关 键 词：开挖卸荷 深部巷道 失稳变形 评价体系 应力场 耦合作用 

分 类 号：X936[环境科学与工程—安全科学]