A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Responses of Existing Tunnel Caused by Undercrossing Super-Large Diameter Shield Tunnel
As operation of underground transportation gradually tends to be networked in urban areas of China, more and more tunnels are constructed closely to the existing tunnels. The new tunnel crossing could cause additional deformation of the existing tunnel and ground. However, the impact of super-large diameter tunnel undercrossing on existing tunnels is less studied. This paper analyzed the deformation behavior of existing metro tunnels caused by super-large diameter shield tunnel undercrossing based on numerical simulation on a project in Shanghai, China. The accuracy of the numerical simulation was verified by comparing with the measured data. Furthermore, a parametric analysis was conducted to study the impact of different tunnel spacing between the existing and new tunnels on the deformation of the existing tunnel considering orthogonal undercrossing. The researched tunnel spacing ranged from 0.25 D1 to 1.75 D1, where D1 is the existing tunnel diameter. The results indicate that the tunnel spacing has a significant effect on the convergence of the existing tunnel. The two-stage variations of convergence rate for the existing tunnel was revealed, which can be divided into rapid-decline stage (0.25 D1–0.75 D1) and slow-decline stage (0.75 D1–1.75 D1). Moreover, the intelligent real-time ground-penetrating radar (GPR) detection system is introduced to guide on grouting parameters of super-large diameter shield tunnel, which is important for controlling volume loss, ground settlement and existing tunnel deformation. This study can provide guidance for the planning and design of new tunnels and the protection of existing tunnels.
Responses of Existing Tunnel Caused by Undercrossing Super-Large Diameter Shield Tunnel
As operation of underground transportation gradually tends to be networked in urban areas of China, more and more tunnels are constructed closely to the existing tunnels. The new tunnel crossing could cause additional deformation of the existing tunnel and ground. However, the impact of super-large diameter tunnel undercrossing on existing tunnels is less studied. This paper analyzed the deformation behavior of existing metro tunnels caused by super-large diameter shield tunnel undercrossing based on numerical simulation on a project in Shanghai, China. The accuracy of the numerical simulation was verified by comparing with the measured data. Furthermore, a parametric analysis was conducted to study the impact of different tunnel spacing between the existing and new tunnels on the deformation of the existing tunnel considering orthogonal undercrossing. The researched tunnel spacing ranged from 0.25 D1 to 1.75 D1, where D1 is the existing tunnel diameter. The results indicate that the tunnel spacing has a significant effect on the convergence of the existing tunnel. The two-stage variations of convergence rate for the existing tunnel was revealed, which can be divided into rapid-decline stage (0.25 D1–0.75 D1) and slow-decline stage (0.75 D1–1.75 D1). Moreover, the intelligent real-time ground-penetrating radar (GPR) detection system is introduced to guide on grouting parameters of super-large diameter shield tunnel, which is important for controlling volume loss, ground settlement and existing tunnel deformation. This study can provide guidance for the planning and design of new tunnels and the protection of existing tunnels.
Responses of Existing Tunnel Caused by Undercrossing Super-Large Diameter Shield Tunnel
Mechan. Machine Science
Li, Shaofan (editor) / Cao, Yuyang (author) / Xie, Xiongyao (author) / Zhou, Biao (author) / Wu, Huaqi (author) / Wang, Cheng (author) / Li, Kang (author)
International Conference on Computational & Experimental Engineering and Sciences ; 2023 ; Shenzhen, China
2023-12-05
12 pages
Article/Chapter (Book)
Electronic Resource
English
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