China Safety Science Journal ›› 2021, Vol. 31 ›› Issue (8): 119-124.doi: 10.16265/j.cnki.issn1003-3033.2021.08.017

• Safety engineering technology • Previous Articles     Next Articles

Coupling analysis on disaster-inducing factors for large deformation accidents in soft rock tunnels

DAI Shiwei1, LIU Xinxin1, WAN Fei2   

  1. 1 Engineering Management Department, China Road & Bridge Corporation, Beijing 100008, China;
    2 Bridge and Tunnel Research Center, Research Institute of Highway Ministry of Transport, Beijing 100073, China
  • Received:2021-05-02 Revised:2021-07-10 Online:2021-08-28 Published:2022-02-28

Abstract: In order to reduce influence of experts' subjective judgment on evaluation of large deformation accidents in soft rock tunnels, a reverse analysis method is proposed to study coupling mechanism of disaster-inducing factors. Based on investigation into 69 cases, main disaster-inducing factors and their frequency rates were analyzed. Then, according to the first 4 major factors and theirs correlation, a N-K model-based coupling model of all factors was established by studying their coupling paths and coupling process via using system dynamics theory. Finally, their coupling correlation values were calculated and ranking of coupling influence was obtained in accordance with the values. The results show that the order of their coupling influence goes as coupling of four factors, surrounding rock lithology, groundwater, geostress and support strength > that of three, surrounding rock lithology, groundwater and geostress > coupling of two, groundwater and geostress. Although groundwater and geostress are two factors coupling, they produce bigger coupling value than that of three factors, so they should be paid special attention and well controlled before and after construction.

Key words: soft rock tunnel, large deformation accident, disaster-inducing factors, coupling analysis, coupling path, N-K model

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