Geomechanics and Engineering

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A two-step interval risk assessment method for water inrush during seaside tunnel excavation

  • Zhou, Binghua (Geotechnical and Structural Engineering Research Center, Shandong University) ;
  • Xue, Yiguo (Geotechnical and Structural Engineering Research Center, Shandong University) ;
  • Li, Zhiqiang (Geotechnical and Structural Engineering Research Center, Shandong University) ;
  • Gao, Haidong (China Railway 18th Bureau Group Co. Ltd.) ;
  • Su, Maoxin (Geotechnical and Structural Engineering Research Center, Shandong University) ;
  • Qiu, Daohong (Geotechnical and Structural Engineering Research Center, Shandong University) ;
  • Kong, Fanmeng (Geotechnical and Structural Engineering Research Center, Shandong University)
  • Received : 2020.05.19
  • Accepted : 2022.02.04
  • Published : 2022.03.25
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Abstract

Water inrush may occur during seaside urban tunnel excavation. Various factors affect the water inrush, and the water inrush mechanism is complex. In this study, nine evaluation indices having potential effects on water inrush were analysed. Specifically, the geographic and geomorphic conditions, unfavourable geology, distance from the tunnel to sea, strength of the surrounding rock, groundwater level, tidal action, cyclical footage, grouting pressure, and grouting reinforced region were analysed. Furthermore, a two-step interval risk assessment method for water inrush management during seaside urban tunnel excavation was developed by a multi-index system and interval risk assessment comprised of an interval analytic hierarchy process, fuzzy comprehensive evaluation, and relative superiority analysis. The novel assessment method was applied to the Haicang Tunnel successfully. A preliminary interval risk assessment method for water inrush was performed based on engineering geological conditions. As a result, the risk level fell into a risk level IV, which represents a section with high risk. Subsequently, a secondary interval risk assessment method was performed based on engineering geological conditions and construction conditions. The risk level of water inrush is reduced to a risk level II. The results agreed with the current tunnel situation, which verified the reliability of this approach.

Keywords

Acknowledgement

Much of the work presented in this paper was supported by the National Natural Science Foundations of China (grant numbers 41877239, 51379112, 51422904 and 41772298), Key Technology Research and Development Program of Shandong Province (grant number 2019GSF111028) and the Fundamental Research Funds of Shandong University (2018JC044). The authors would like to express appreciation to the reviewers for their valuable comments and suggestions that helped improve the quality of our paper.

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