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Construction control technology of a four-hole shield tunnel passing through pile foundations of an existing bridge: A case study

四洞交叠盾构隧道近距离下穿既有桥梁桩基施工控制技术研究

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Abstract

In dense urban building environments, various adjacent construction projects will inevitably occur during the large-scale construction of urban underground transportation projects. Based on an actual project, this paper conducted a practical study on the construction control technology of a four-hole shield tunnel passing through existing bridge-pile foundations over a short distance and proposed a micro-disturbed control technology system of “two-stage analysis method theoretical prediction + active control and passive protection”. The core content of the technology system included the following: 1) By introducing an additional ground loss ratio, a theoretical calculation method for predicting the deformation of pile foundations during the adjacent construction of a multi-line tunnel was established, which enabled the preconstruction prediction of the influence of construction on the adjacent structures. 2) A multi-coupled numerical model, which included tunnels, strata, and pile foundations, was developed to analyze the mechanical behavior of the pile foundations during the entire construction process. 3) Combined with practical engineering experience, the control measures of this project were implemented in terms of active control and passive protection. The deformation of the pile foundations was effectively controlled during the construction process, which certified that the proposed micro-disturbed control technology was reasonable and feasible.

摘要

在密集的城市建筑环境中, 在城市地下交通的大规模兴建过程中不可避免地会出现各类近接施工工程。依托一实际工程, 针对四洞交叠盾构隧道近距离下穿既有桥梁桩基施工控制技术开展实践研究, 总结提出了“两阶段法理论预测+主动控制与被动保护”的近接施工微扰动控制技术体系。该技术体系的核心内容包括: 1)通过引入附加地层损失率, 建立多线隧道近接施工时桩基变形的理论计算方法, 实现近接施工对邻近建(构)筑物影响的工前预测。2)建立隧道-地层-桩基多元耦合模型, 分析四线交叠盾构隧道施工全过程力学行为。3)结合工程实践经验, 分别从主动控制和被动保护两方面提出依托工程的控制措施。在依托工程开挖完成过程中, 邻近桥梁桩基变形得到有效控制, 表明所提出的近接施工微扰动控制技术是合理可行的。

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Authors and Affiliations

  1. School of Civil Engineering, Central South University, Changsha, 410075, China

    Ming-feng Lei  (雷明锋), Yuan-bo Shi  (石渊博), Qian-long Tang  (唐钱龙), Ning-xin Sun  (孙宁新) & Chen-jie Gong  (龚琛杰)

  2. Key Laboratory of Engineering Structure of Heavy Haul Railway, Changsha, 410075, China

    Ming-feng Lei  (雷明锋)

  3. Shandong Provincial Communications Planning and Design Institute Group Co., Ltd., Jinan, 250031, China

    Ning-xin Sun  (孙宁新)

  4. China Railway Liuyuan Group Co., Ltd., Tianjin, 300308, China

    Zhi-hui Tang  (唐志辉)

Authors
  1. Ming-feng Lei  (雷明锋)
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  2. Yuan-bo Shi  (石渊博)
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  3. Qian-long Tang  (唐钱龙)
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  4. Ning-xin Sun  (孙宁新)
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  5. Zhi-hui Tang  (唐志辉)
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  6. Chen-jie Gong  (龚琛杰)
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Contributions

The overarching research goals were developed by LEI Ming-feng, TANG Qian-long, SUN Ning-xin, and GONG Chen-jie. The initial draft of the manuscript was written by SHI Yuan-bo. SUN Ning-xin established the models and calculated the predicted displacements. TANG Zhi-hui performed the field monitoring.

Corresponding author

Correspondence to Ming-feng Lei  (雷明锋).

Ethics declarations

LEI Ming-feng, SHI Yuan-bo, TANG Qian-long, SUN Ning-xin, TANG Zhi-hui, GONG Chen-jie declare that they have no conflict of interest.

Additional information

Foundation item: Porject(51978669) supported by the National Natural Science Foundation of China; Porject(2021JJ30825) supported by the Natural Science Foundation of Hunan Province, China

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Lei, Mf., Shi, Yb., Tang, Ql. et al. Construction control technology of a four-hole shield tunnel passing through pile foundations of an existing bridge: A case study. J. Cent. South Univ. 30, 2360–2373 (2023). https://doi.org/10.1007/s11771-023-5368-7

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  • DOI: https://doi.org/10.1007/s11771-023-5368-7

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