Geotechnical influence on existing subway tunnels induced by multiline tunneling in Shanghai soft soil |
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| Institution: | 1. School of Environment and Architecture, University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai 200093, China;2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China;3. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China;4. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China;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. School of Civil Engineering, Tianjin University, Tianjin 300072, China;2. 5th Engineering Co Ltd, China Railway 18th Bureau, Tianjin 300451, China;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. 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. School of Civil Engineering, Central South University, Changsha 410075, China;2. Key Laboratory of Engineering Structure of Heavy Haul Railway (Central South University), Changsha 410075, China |
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| Abstract: | Multiline tunneling construction in soft soil significantly impedes risk control and environmental protection. Current research has investigated on the effect of single-line shield excavation on surrounding environments and tunneling for parallel-crossing or perpendicular down-crossing underground structures. However, minimal attention has been given to soil disturbances induced by multiline tunneling and complex overlapped interaction mechanics for adjacent structures, such as existing above-crossing and down-crossing subway tunnels. Few studies focus on oblique crossing construction and setting rules for the operation parameters of shield machines. Based on the Shanghai Railway transportation project and in situ monitoring data, the deformation analyses of existing subway tunnels induced by an earth pressure balance (EPB) shield during the process of above-overlapped and down-overlapped crossing tunnels with oblique angles are presented. The deformation analyses employ the three-dimensional finite element (3D FE) numerical simulation method, and the simplified analytical method. The analysis results from the theoretical methods are consistent with the monitoring data. The setting rules of multiline propulsion main parameters, including the earth pressure for cutting open, and the synchronized grouting, are also established. This study may provide a theoretical basis for the development of properly overlapped crossing schemes and geotechnical protective measures during multiline tunneling construction in soft soil. |
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| Keywords: | EPB shield Multiline tunneling Geotechnical deformation Simplified analysis Numerical simulation Case history |
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