铁道标准设计2024，Vol.68Issue(7)：132-140,9.DOI:10.13238/j.issn.1004-2954.202211160007
浅埋超大跨四线隧道Ⅴ级围岩开挖关键参数研究
Study on Key Excavation Parameters of Shallow Super-large-span Four-track Tunnel Under Grade-Ⅴ Surrounding Rockmass
摘要
Abstract
In order to adapt to the urban terrain and select high-speed railway line,some lines have to be constructed in shallow and grade-Ⅴ rockmass,and there is a lack of regulatory guidance for such tunnels in currently specifications.The key excavation parameters of these tunnels should be studied.The mechanical response of shallow super-large-span four-track tunnel is studied by using field test based on the background of Xiabeishan tunnel in Hangzhou-Taizhou High-speed Railway,and the key excavation parameters under grade-Ⅴ rockmass are summarized by carrying out numerical simulation.The result shows that the vault settlement induced by double side drift method(DSDM)mainly occurs at the excavation phase of the upper benches,and excavation of central rock pillar has the most contribution of 62.2% to the vault settlement.The load-carrying capability of shotcrete structure and steel arch meets the safety requirements,and initial support has surplus safety capability.DSDM has a better control effect on rockmass deformation,but the stress distribution of surrounding rockmass induced by the three-bench method is more uniform,and the safety factor of the initial support is also reasonable.Considering that DSDM could cause a low construction efficiency due to the temporary supports,it is advisable to explore the optimization of the DSDM into the three-bench method for improving the construction efficiency.关键词
浅埋隧道/超大跨度隧道/Ⅴ级围岩/开挖关键参数/分部开挖/现场测试/数值模拟Key words
shallow tunnel/super-large-span tunnel/grade-V rockmass/key excavation parameters/subdivision excavation/filed test/numerical simulation分类
交通工程引用本文复制引用
刘夏冰,王雨,王文谦,贺少辉,麻建飞..浅埋超大跨四线隧道Ⅴ级围岩开挖关键参数研究[J].铁道标准设计,2024,68(7):132-140,9.基金项目
广东省重点领域研发计划资助项目(2022B0101070001) （2022B0101070001）
中铁大桥局集团第四工程有限公司资助项目(CL19048530) （CL19048530）
