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A static risk assessment model for underwater shield tunnel construction

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Abstract

The shield method is widely used in underwater tunnel construction. However, the shield construction process faces many uncertain risk factors that increase the level of safety risk during shield tunnel construction. Therefore, risk assessment has become a necessary task in the early stages of tunnel construction. In this study, a new risk assessment model for underwater shield tunnel construction is proposed that combines a normal cloud model with an entropy weight method. The model contains 20 assessment indexes and gives the range of each index corresponding to different risk levels, which comprehensively reflects the influencing factors of risk. By using a normal cloud model, the fuzziness and randomness of risk assessment data are taken into account effectively, and the reliability of assessment results is increased. Based on an entropy weight method, the rules and characteristics of the evaluation data in the model are considered, and the weight coefficient of the evaluation index is determined to avoid the subjectivity of the expert weight method. The risk assessment model is applied using the Xiangjiang shield tunnel as an example. The results show that the overall construction risk level of the Xiangjiang tunnel is level II, which is consistent with the site risk situation and shows that the model can objectively and accurately evaluate the construction risk level of an underwater shield tunnel.

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Authors and Affiliations

  1. School of Civil Engineering, Housing and Urban-Rural Development of Heng Yang, University of South China, Hengyang, China

    Zhiqiang Wu

  2. School of Civil Engineering, University of South China, Hengyang, China

    Shuliang Zou

Authors
  1. Zhiqiang Wu
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  2. Shuliang Zou
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Correspondence to Zhiqiang Wu.

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Wu, Z., Zou, S. A static risk assessment model for underwater shield tunnel construction. Sādhanā 45, 215 (2020). https://doi.org/10.1007/s12046-020-01370-w

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  • DOI: https://doi.org/10.1007/s12046-020-01370-w

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