摘要
为保证大断面隧道施工期间的安全性和高效性,以实际工程为依托,利用ANSYS数值模拟软件,研究了某地铁隧道出入场线分别采用双中隔壁台阶法和中隔壁法(CD法)开挖的施工过程,分析隧道开挖过程中围岩的位移和衬砌结构的应力变化情况。研究结果表明:大跨度隧道在软岩中的开挖采用中隔墙法产生的位移和衬砌结构应力都在安全范围内。双中隔壁台阶法采用三台阶施工每个台阶均可使用机械施工提高了开挖效率,与中隔墙法相比产生的位移和衬砌结构应力更小,拱顶处竖向位移最大不超过16.2mm,开挖10m即DK45+868处衬砌结构的等效应力最大值不超过19.9MPa,因此控制位移变形能力和衬砌结构应力效果更好,可优先考虑双中隔壁台阶法。同时在实际工程中监测位移与模拟值差距在1mm以内,验证了模拟结果的可行性。
In order to ensure the safety and efficiency during the construction of large section tunnels,the construction process of a subway tunnel access line excavated by double center diaphragm step method and center diaphragm method(CD method) respectively was studied by using ANSYS numerical simulation software based on the actual project to analyze the displacement of the surrounding rock and the stress change of the lining structure during the tunnel excavation.The results show that the displacements and stresses in the lining structure of large-span tunnels excavated in soft rock using the middle diaphragm method are within the safe range.The double center diaphragm method uses three steps of construction each step can use mechanical construction to improve the excavation efficiency,compared with the center diaphragm method to produce smaller displacement and lining structure stress,the maximum vertical displacement at the top of the arch does not exceed 16.2mm,excavation 10m that is DK45+868 lining structure equivalent force maximum does not exceed 19.9MPa,so the ability to control displacement deformation and lining structure stress can be controlled better.Therefore,the ability to control the displacement deformation and lining structure stress is better,and priority can be given to the method of double middle door step.Meanwhile,the difference between the monitored displacement and the simulated value is within 1mm in the actual project,which verifies the feasibility of the simulation results.
作者
王丽敏
贾虎
汪海波
杨明
Wang Limin;Jia Hu;Wang Haibo;Yang Ming(School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan,Anhui 232001,China;School of Civil Engineering and Architecture,Nanyang Normal University,Nanyang,Henan 473061,China;China Coal Third Construction(Group)Co.,Ltd,Hefei,Anhui 230000,China)
出处
《黑龙江工业学院学报（综合版）》
2023年第8期111-118,共8页
Journal of Heilongjiang University of Technology(Comprehensive Edition)
基金
安徽省自然科学基金资助项目(项目编号:2008085ME163)。
关键词
地铁隧道
双中隔壁台阶法
中隔壁法
施工方案
subway tunnels
double center diaphragm method
center diaphragm method
construction schemes
