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Back Analysis of Water and Earth Loads on Shield Tunnel and Structure Ultimate Limit State Assessment: A Case Study

  • Research Article - Civil Engineering
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Abstract

A method based on the least-squares method was proposed for the back analysis of water and earth loads using in situ monitoring data of a limited amount of structural strain values for a shallow shield tunnel buried in the soil stratum. Theoretical formulas were used to calculate the internal forces, conduct an assessment of the ultimate limit state, and determine the safety factors of compression and shear. Based upon all of the above, an assessment system was established, and its procedures were illustrated. The highlights of this assessment system are that only a few strain monitoring points are required for the back analysis of the external loads, the internal forces in every position of the segment are calculated by the uniform rigidity ring model, and the safety assessment is conducted by the proposed ultimate limit state formulas. According to the in situ monitoring project in Nanjing subway line 1, the monitoring data of internal forces were close to the back analysis data, which proves the reliability of this method.

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Acknowledgments

Financial support for this work provided by the National Key R & D Program of China (Grant No. 2016YFC0802205), and the National Science Foundation of China (Grant No. 51678500) is gratefully acknowledged.

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Authors and Affiliations

  1. Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu, Sichuan, China

    Qixiang Yan, Weilie Zhang, Chuan Zhang & Hang Chen

  2. China Water Conservancy and Hydropower Seventh Engineering Bureau Co., Ltd, Chengdu, Sichuan, China

    Yongwen Dai & Hongyuan Zhou

Authors
  1. Qixiang Yan
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  2. Weilie Zhang
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  3. Chuan Zhang
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  4. Hang Chen
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  5. Yongwen Dai
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  6. Hongyuan Zhou
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Correspondence to Chuan Zhang.

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Yan, Q., Zhang, W., Zhang, C. et al. Back Analysis of Water and Earth Loads on Shield Tunnel and Structure Ultimate Limit State Assessment: A Case Study. Arab J Sci Eng 44, 4839–4853 (2019). https://doi.org/10.1007/s13369-018-3569-4

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  • DOI: https://doi.org/10.1007/s13369-018-3569-4

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