摘要
为了探究公路隧道浅埋段隧道围岩开挖后拱顶和两侧拱腰位置围岩变形规律,以某长隧道开挖为工程实例,选择断层下裂隙发育,岩石破碎下的隧道断面监控量测数据进行研究分析。采用COMSOL Multiphysis有限元模拟软件,通过设置岩体力学参数微分方程,引入结构面刚度矩阵方程来描述节理裂隙对围岩力学参数的影响,利用瞬态计算方法模拟了隧道上下台阶开挖后围岩的动态变形过程。将模拟结果和监控量测实测数值对比分析发现:隧道围岩变形的模拟值和监控量测实测值总体变化趋势基本一致,但模拟值值略大于实际测量值,两者差距不大。模拟能够很好地反映隧道开挖过程中围岩的变形和位移,能为隧道开挖后围岩的变形做出预测。
In order to explore the deformation law of the surrounding rock at the vault and the side of the arch waist after excavation of the shallow section of the highway tunnel,a long tunnel excavation is taken as an engineering example,and the tunnel section under the fracture with the cracks developed under the fault is selected.Monitor measurement data for research and analysis.Using COMSOL Multiphysis finite element simulation software,by setting the rock mass mechanical parameter differential equation,introducing the structural surface stiffness matrix equation to describe the effect of joint fissures on the surrounding rock mechanical parameters,the transient calculation method is used to simulate the surrounding rock after excavation of the upper and lower steps of the tunnel The dynamic deformation process・Comparing the simulation results with the measured values of the monitoring measurement,it is found that the overall change trend of the simulated value of the tunnel surrounding rock deformation and the measured value of the monitoring measurement is basically the same,but the simulated value is slightly larger than the actual measurement value,and there is not much difference between the two.The simulation can well reflect the deformation and displacement of the surrounding rock during the tunnel excavation process,and can predict the deformation of the surrounding rock after the tunnel excavation.
作者
杨晓泉
袁伟
李晓猛
Yang Xiaoquan;Yuan Wei;Li Xiaomeng(Road Network Monitoring and Emergency Command Center,Department of Transportation of Yunnan Province,Kunming,Yunnan 650001;Yunnan Provincial Highway Science and Technology Research Institute,Kunming,Yunnan 650001)
出处
《江西建材》
2020年第10期107-109,111,共4页
Jiangxi Building Materials
关键词
公路隧道
沉降分析
有限元分析
Highway tunnel
Settlement analysis
Finite element analysis
