基于约束收敛法的Hoek-Brown岩体巷道大变形分析  

Analysis on Hoek-Brown rock roadway large deformation based on convergence confinement method

作　　者：刘洪磊[1] 张权云 关凯[1] 朱万成[1] 于庆磊[1] LIU Honglei;ZHANG Quanyun;GUAN Kai;ZHU Wancheng;YU Qinglei(School of Resources and Civil Engineering,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819

出　　处：《中国矿业》2023年第9期136-144,共9页China Mining Magazine

基　　金：国家自然科学基金青年项目资助(编号:52004053);辽宁省科技厅自然科学基金博士启动基金资助(编号:2021-BS-052);国家自然科学基金面上项目资助(编号:52174070)。

摘　　要：轴对称圆形巷道的弹塑性理论分析是深部软岩巷道施工过程的基础问题和重要问题。基于约束收敛法、有限变形次弹塑性理论、Hoek-Brown破坏准则、应变软化本构模型等基本理论,开展了深埋软弱围岩圆形巷道开挖诱致挤压大变形现象的基础研究。在相关大变形研究的基础上,以巷道开挖后围岩脆塑性解析解来表征岩体应变软化区划分圆环岩体响应解析解的方法,简述Hoek-Brown岩体深埋软岩巷道围岩各分区应力与变形解析解求解思路。通过现场监测数据和不同力学模型的计算结果分别进行模型有效性对比验证,并对m、s、a等岩体强度相关参数进行了影响分析。基于大变形和小变形理论下围岩特征曲线差别,提出软弱破碎岩体的支护建议,为深部不利赋存条件下软弱围岩支护工程设计提供理论分析手段和指导。The elastic-plastic theoretical analysis of the axisymmetric circular roadway is the basis and important problem in the construction process of deep soft rock roadway.Based on the basic theories such as the convergence confinement method,finite deformation sub elastic-plastic theory,Hoek Brown failure criterion,strain softening constitutive model and so on,the basic research on the squeezing large deformation caused by the excavation of circular roadway in deep soft surrounding rock is carried out.On the basis of research on large deformation,uses the brittle plastic analytical solution of surrounding rock after tunnel excavation to characterize the strain softening zone of rock mass.The analytical solution of stress,deformation and radius of each zone of surrounding rock of deep soft rock roadway in Hoek-Brown rock mass is briefly described.The effectiveness of the model is verified by comparing the field monitoring data and the calculation results of different mechanical models,and the influence of the relevant strength parameters of the rock such as m,s,a are analyzed.Based on the difference of surrounding rock characteristic curve under the theory of large deformation and small deformation,the support suggestions for soft broken rock mass are proposed,which provides theoretical analysis means and guidance for support engineering design of soft surrounding rock under deep and unfavourable conditions.

关 键 词：巷道变形 HOEK-BROWN准则 应变软化行为 约束收敛法 支护设计 

分 类 号：TD353[矿业工程—矿井建设]