A case history of shield tunnel crossing through group pile foundation of a road bridge with pile underpinning technologies in Shanghai |
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| Affiliation: | 1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai, China;2. Key Laboratory of Road and Traffic Engineering of Ministry of Education, Tongji University, Shanghai, China;3. Shanghai Shentong Metro Co., Ltd, Shanghai, China;4. Department of Civil Engineering, Shanghai University of Science and Technology, Shanghai, China;1. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China;2. School of Civil and Environmental Engineering, Nanyang Technological University, Singapore 639798, Singapore;1. College of Civil Engineering and Architecture, Zhejiang University, China;2. Department of Civil Engineering, The Quaid-e-Awam University of Engineering, Science & Technology, Sindh, Pakistan;3. Department of Civil and Environmental Engineering, Hong Kong University of Science and Technology, Hong Kong Special Administrative Region;4. School of Transportation, Wuhan University of Technology, China;1. School of Civil Engineering, Central South University, Changsha, Hunan 410075, China;2. China Construction Fifth Engineering Division CROP., Ltd., Changsha 410004, China;1. School of Civil Engineering, Chongqing University, Chongqing 400045, China;2. National Joint Engineering Research Center of Geohazards Prevention in the Reservoir Areas, Chongqing 400045, China;1. College of Civil Engineering and Architecture, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, China;2. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, China;3. School of Civil Engineering and Architecture, Zhejiang Sci-Tech University, Hangzhou 310018, China;1. School of Environment and Architecture, University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai 200093, China;2. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China;3. Key Laboratory of Urban Underground Engineering of Ministry of Education, Beijing Jiaotong University, Beijing 100044, China;4. East China Architecture Design and Research Institute Co., Ltd., Shanghai 200002, China |
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| Abstract: | According to the planning of Shanghai metro line 10, the interval tunnel from Liyang Road station to Quyang Road station has to cross through the group pile foundation of Shajinggang Bridge on Siping Road. Therefore, how to guarantee the normal traffic function and the safety of bridge structure during the tunneling process becomes a challenge to engineers and technicians. To solve this problem, the pile underpinning technology was recommended for this project. This specific scheme mainly comprises following steps, i.e. ground improvement behind abutment, foundation pit excavation under bridge deck, underpinning pile with raft and cutting pile with shield machine directly, etc. In order to verify the feasibility of this scheme, a series of theoretical analysis and numerical simulation were carried out on the entire construction process to explore the load transfer mechanism of bridge structure. The calculation results show that both the bridge static loads and traffic live loads can be successfully transferred from pile foundation to raft after pile underpinning, and the removal of obstructed piles during tunneling has very limited influence on bridge structure. Furthermore, real-time field monitoring activities, including settlement of bridge deck surface, deformation of surrounding buildings and pipelines, etc. were also conducted to ensure smooth construction. The monitored results agree well with the numerical calculation ones, which prove again that the proposed scheme is reasonable and the calculation results are reliable. |
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| Keywords: | Shield tunnel Pile underpinning Ground treatment Load transfer mechanism |
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