RESEARCH AND APPLICATION OF U-BIT CONSTRUCTION METHOD IN SUBWAY STATION ENGINEERING LOCATED IN SATURATED SOFT SOIL AREA
Keywords:Underground excavation method, Underground bundled integrate tunnel, Saturated soft soil, Subway station, Prestressed tension, Ground surface subsidence
In order to solve the problems existing in the construction of underground structures located in the downtown of saturated soft soil area, such as insufficient construction site, complex adjacent structures and great impact on the surrounding environment, the construction method of underground bundled integrate tunnel(U-BIT) is proposed. In this method, after steel pipes jacking completed, concrete is filled into the pipes, and prestress is tensioned to make each independent pipe combined to form a whole bearing structure, so as to achieve the purpose of reducing the size of structural components, improving the structural stiffness and bearing capacity. Based on the structural mechanical properties test and the project of Wuding Road Station of Shanghai Metro Line 14, the failure mechanism of bundled integrate structure, the tension technology of prestressed tendons in narrow space and the variation rules of ground surface subsidence are systematically studied. The research shows that structural seam sections will be destroyed before pipe sections, so ensuring the mechanical performance of seam sections is very important to make sure the structural safety. Since each independent pipe is combined to form an overall stable structure under the prestress effect, the subsequent soil excavation has little influence on the tension of prestressed tendons and ground surface deformation. Therefore, the above construction method can control the ground surface subsidence effectively and reduce the influence of underground engineering construction on the surrounding environment.
Liu Fei, Wang Huiming, Li Huanqiu, Huang Xu, 2021. Numerical Analysis on Ultra-shallow Buried Excavation Method in Underground Commercial street. Chinese Journal of Underground Space and Engineering, vol.17(S1): 180-186.
Chen Jingjun, 2021. Design of Double Deck Tunnel under Passing Urban Main Road with Super Shallow Buried Subsurface Excavation Method. Chinese Journal of Underground Space and Engineering, vol.17(03): 825-833.
Code for Construction and Acceptance of Shield Tunnelling Method(GB 50446-2017), 2017. China Architecture and Building Press.
Liu Fang, Cui Jian, Xu Wanghao, Gao Feng, 2018. Ground Settlement Characteristics for Launching Section of Shallow Overburden Excavation of Large-diameter Slurry Shield Tunnel. Journal of Railway Engineering Society, vol.35(12): 36-40+69.
Zhong Xiaochun, He Chunhao, Li Yongyun, Wang Ziyi, Chen Jie, 2022. Study on Surface Uplift Caused by Construction of Shallow-buried Soil Rectangular Pipe Jacking at Subway Entrance and Exit. Journal of Southwest Jiaotong University, http://kns.cnki.net/kcms/detail/51.1277.U.20220402.1156.002.html.
Xiong Xueyu, Gao Xinyu, Wang Shousheng, Xu Jun, Du Wei, 2018. Study on Technology and Design Method of Prestressed Concrete Roof. Building Structure, vol.48(8): 91-97.
Zhu Yanfei, Guo Yan, Pan Weiqiang, Zhao Xiaopeng, 2020. Application of Pipe-roofing Method with Various Section Types in Metro Construction of Guiqiao Road Station at Saturated Soft Soil Area. Tunnel Construction, vol. 40(4): 552-560.
Zhu Yanfei, Bi Xiangli, Guo Yan, Pan Weiqiang, 2021. Summary of Research on Underground Station Excavation Method of Rail Transit at Saturated Soft Soil Area. Tunnel and Rail Transit, vol.(S1): 1-7.
Tang Zheng, Wang Hongxin, Sun Dean, 2022. Study on Law of Surface Displacement during Pipe Roof Construction of Pipe-jacking Group with Large Section. Rock and Soil Mechanics, vol.43(7): 1-9.
Pan Weiqiang, 2019. Monitoring and Analysis of Ground Settlement during Pipe Roof Construction of Pipe-jacking Groups in Soft Soil Areas. Chinese Journal of Geotechnical Engineering, vol.41(S1): 201-204.
Cheng Panpan, Shen Yi, Zhao Xiaopeng, Li Xinxing, Zhu Hehua, 2021. Numerical Analysis and Parameter Optimization of Pipe Curtain Excavation Method in Soft Soil Subway Station. Modern Tunnelling Technology, vol.58(S1): 240-250.
Bi Xiangli, Wang Xiuzhi, Zhang Zhongjie, Pan Weiqiang, Jiao Bochang, Liu Xian, 2022. Full-scale Experimental Study on Shear Performance of Joints of the Bundled Integrate Structure. Journal of Railway Science and Engineering, https://doi.org/10.19713/j.cnki.43-1423/u.T20220291.
Zhang Yaosan, 2020. Study on Prestressed and Integrated Pipe Roof Technology in Saturated Soft Soil Area. Tunnel and Rail Transit, vol.(4): 35-38.
Bi Xiangli, Zhang Zhongjie, Liu Shu, Jiao Bochang, Liu Xian, 2022. Full-scale Experimental Study on Mechanical Behaviors of Bundled Integrate Structure in Saturated Soft Soil Area. Tunnel Construction, vol.42(6): 953-959.
Zhai Yixin, 2022. System for Square Pipe Jacking Machine with Bundle Pipe Curtain. China Municipal Engineering, vol.(2): 96-101.
Peng Shibao, 2022. Bundle Tube Curtain Planetary Driving Multi Cutter Head Square Pipe Jacking Machine Development and Engineering Practice. Mechanical Equipment, vol.(1): 58-61.
Code for Design of Concrete Structures (GB 50010-2010), 2015. China Architecture and Building Press.
How to Cite
Copyright (c) 2023 Stavební obzor - Civil Engineering Journal
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
Authors who publish with this journal agree to the following terms:
- Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).