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Investigation of the first quasi-rectangular metro tunnel constructed by the 0-θ method

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Abstract

Quasi-rectangular shield tunneling is a cutting-edge trenchless method for constructing metro tunnels with double tubes, owing to its advantages in saving underground space and reducing ground disturbance. However, the conventional quasi-rectangular shield tunneling method is not applicable when constructing a tunnel without a center pillar, such as a scissor crossover section of a metro line. Therefore, the 0-θ tunneling method, which combines the quasi-rectangular shield and pipe jacking methods, was investigated in this study to solve the aforementioned construction challenges. This study presents a case study of the Sijiqing Station of the Hangzhou Metro Line 9 in China, in which the 0-θ method was first proposed and applied. Key techniques such as switching between two types of tunneling modes and the tunneling process control in complex construction environments were investigated. The results demonstrated that the 0-θ method can address the technical challenges presented by the post-transition line with a high curvature and a scissors crossover line. In addition, the adoption of the 0-θ method ensured that the transformation between shield tunneling and pipe jacking was safe and efficient. The ground settlement monitoring results demonstrated that the disturbance to the surrounding environment can be limited to a safe level. This case study contributes to the construction technology for a metro tunnel containing both post-transition lines with a small turning radius and a scissors crossover line. A practical construction experience and theoretical guidance were provided in this study, which are of significance for both the industry and academia.

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Acknowledgements

This study was supported by the Social Development Project of Science and Technology Commission of Shanghai Municipality (No. 21DZ1201105), the Fundamental Research Funds for the Central Universities (No. 21D111320), and the National Natural Science Foundation of China (Grant No. 42201489).

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Authors and Affiliations

  1. College of Environmental Science and Engineering, Donghua University, Shanghai, 201620, China

    Peinan Li & Xue Liu

  2. Department of Civil and Environmental Engineering, University of Tennessee, Knoxville, TN, 37996, USA

    Xi Jiang

  3. Department of Geoscience and Engineering, Delft University of Technology, Delft, 2628, The Netherlands

    Xuehui Zhang

  4. College of Urban Railway Transportation, Shanghai University of Engineering Science, Shanghai, 201620, China

    Jun Wu

  5. Shanghai Tunnel Engineering Co.. Ltd., Shanghai, 200032, China

    Peixin Chen

Authors
  1. Peinan Li
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  2. Xue Liu
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  3. Xi Jiang
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  4. Xuehui Zhang
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  5. Jun Wu
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Correspondence to Xi Jiang.

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Conflict of Interest The authors declare that they have no conflict of interest.

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Li, P., Liu, X., Jiang, X. et al. Investigation of the first quasi-rectangular metro tunnel constructed by the 0-θ method. Front. Struct. Civ. Eng. 17, 1707–1722 (2023). https://doi.org/10.1007/s11709-023-0991-9

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  • DOI: https://doi.org/10.1007/s11709-023-0991-9

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