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- Title
Risk assessment of water inrush in karst tunnels based on fuzzy comprehensive evaluation considering misjudgment losses: a case study.
- Authors
Sun, Xingliang; Teng, Guo; Guo, Xiaolong; Li, Xinzhi
- Abstract
A risk assessment method of water inrush in karst tunnels is proposed on the basis of the theories of secondary fuzzy comprehensive evaluation and the Fuzzy Analytical Hierarchy Process (FAHP). In this method, four first-grade indices and twelve second-grade indices are selected to construct a secondary fuzzy comprehensive evaluation model, in which the FAHP, which is considered to be an improvement of the AHP, is used to distribute the weights of the evaluation indices. The risk of water inrush is divided into four levels from low to high. The evaluation level of a portion of a karst tunnel is determined by the maximum membership degree principle. If the values of two neighboring elements in the evaluation set are very close, misjudgment of the risk level is prone to happen; thus, Bayesian discrimination is introduced to reassess the risk level with the consideration of misjudgment losses. Based on the assessment results, geological investigation techniques such as tunnel seismic prediction, ground-penetrating radar, and advance probe boreholes are recommended to verify the existence of karst and further predict the location, size, distribution, and filling features of the karst ahead of the tunnel face. The proposed method was applied to the Yakouzhai tunnel project, and good agreements between the predicted results and the practical situation of karst revealed by tunnel excavation were achieved. Thus, the proposed risk assessment method can provide a practical reference for the risk assessment and management of karst tunnel construction.
- Publication
Arabian Journal of Geosciences, 2022, Vol 15, Issue 5, p1
- ISSN
1866-7511
- Publication type
Article
- DOI
10.1007/s12517-022-09633-y