Three-dimensional numerical simulation of a mechanized twin tunnels in soft ground |
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| Affiliation: | 1. University of Lyon, INSA of Lyon, Laboratory LGCIE, Villeurbanne, France;2. Grenoble Alpes University, Laboratory LTHE, Grenoble, France;3. Politecnico of Torino, Department of Environmental, Land and Infrastructural Engineering, Italy;4. Hanoi University of Mining and Geology, Department of Underground and Mining Construction, Faculty of Civil Engineering, Hanoi, Viet Nam;1. Department of Civil Engineering, School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2. Department of Civil Engineering, School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China;3. Department of Geotechnical Engineering, Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China;4. Department of Civil Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Minhang District, Shanghai 200240, China;5. Department of Civil Engineering, Shanghai Jiao Tong University and State Key Laboratory of Ocean Engineering, 800 Dong Chuan Road, Minhang District, Shanghai 200240, China;1. Key Laboratory of Geotechnical & Underground Engineering of Ministry of Education, Department of Geotechnical Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China;2. Shanghai Jianke Project Management Co., Ltd., 75 Wanping South Road, Shanghai 200032, China;1. School of Civil Engineering, Tianjin University, Tianjin 300072, China;2. Key Laboratory of Coast Civil Structure Safety (Tianjin University), Ministry of Education, China;3. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China;1. Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong;2. College of Civil and Environmental Engineering, Chongqing University, Shapingba, Chongqing, China;1. Key Laboratory for Urban Underground Engineering of the Education Ministry, Beijing Jiaotong University, Beijing 100044, China;2. School of Civil and Environmental Engineering, Nanyang Technological University, Singapore 639798, Singapore;1. School of Civil Engineering, Central South University, Changsha, Hunan 410075, China;2. China Construction Fifth Engineering Division CROP., Ltd., Changsha 410004, China |
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| Abstract: | The increase in transportation in large cities makes it necessary to construct of twin tunnels at shallow depths. Thus, the prediction of the influence of a new tunnel construction on an already existing one plays a key role in the optimal design and construction of close parallel shield tunnels in order to avoid any damage to the existing tunnel during and after excavation of the new tunnel.Most of the reported cases in the literature on parallel mechanized excavation of twin tunnels have focused on the effects of the ground condition, tunnel size, tunnel depth, surface loads, and relative position between the two tunnels on tunnel behaviour. The numerical investigation performed in this study, using the FLAC3D finite difference element programme, has made it possible to include the influence of the construction process between the two tunnels. The structural forces induced in both tunnels and the development of the displacement field in the surrounding ground have been highlighted.The results of the numerical analysis have indicated a great impact of a new tunnel construction on an existing tunnel. The influence of the lagged distance between the two tunnels faces has also been highlighted. Generally, the simultaneous excavation of twin tunnels causes smaller structural forces and lining displacements than those induced in the case of twin tunnels excavated at a large lagged distance. However, the simultaneous excavation of twin tunnels could result in a higher settlement above the two tunnels. |
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| Keywords: | Numerical modelling Twin tunnel Segmental lining Lining response Settlement |
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