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<p>With the influence of crustal tectonic movement, squeezing geostress is dominative in suture zone, the rock masses are weak, and mechanical state for tunnel is complex, resulting in serious complex deformation and failure of tunnel support structure. The Boten–Vientiane Railway, through the Luang Prabang suture zone, had occurred numerous varying degrees of squeezing deformation during the tunnel construction, making it a typical case for studying this issue. Analysis of deformation monitoring data reveals that the tunnel deformation is dominated by continuous horizontal squeezing, with maximum horizontal convergence exceeding 1.4&#xa0;m, demonstrating significant spatial effect. Based on the post-peak characteristic curves of rock mechanical behavior, as well as the strain softening and dilatation effects of rock mass, the theoretical expression for the loosening area of surrounding rock during tunnel excavation was established, the calculated loosening area of Huifulai tunnel was determined to be 7&#xa0;m. Through numerical analysis, the loosening area progressive expanding characteristic were verified, and the loosening area of tunnel sidewall was found to be larger than that of tunnel crown. By testing acoustic wave velocity and internal deformation of surrounding rock, the progressive deformation characteristics of the loosening area during different tunnel construction phases were tested. It was found that the loosening area gradually expands from 3 to 6&#xa0;m, during the tunnel excavation using the bench method. The deformation growth is mainly caused by the internal deformation of surrounding rock in the loosening area. </p>

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Mechanics analysis of weak rock progressive squeezing deformation characteristics for tunnel in suture zone: a case study

  • 期刊论文

  • 发表日期：

    2025年8月9日

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  • Yang Yang,
  • Zonglin Li,
  • Zhongsheng Tan,
  • Chuannian Lin,
  • Zhe Liu

摘要

With the influence of crustal tectonic movement, squeezing geostress is dominative in suture zone, the rock masses are weak, and mechanical state for tunnel is complex, resulting in serious complex deformation and failure of tunnel support structure. The Boten–Vientiane Railway, through the Luang Prabang suture zone, had occurred numerous varying degrees of squeezing deformation during the tunnel construction, making it a typical case for studying this issue. Analysis of deformation monitoring data reveals that the tunnel deformation is dominated by continuous horizontal squeezing, with maximum horizontal convergence exceeding 1.4 m, demonstrating significant spatial effect. Based on the post-peak characteristic curves of rock mechanical behavior, as well as the strain softening and dilatation effects of rock mass, the theoretical expression for the loosening area of surrounding rock during tunnel excavation was established, the calculated loosening area of Huifulai tunnel was determined to be 7 m. Through numerical analysis, the loosening area progressive expanding characteristic were verified, and the loosening area of tunnel sidewall was found to be larger than that of tunnel crown. By testing acoustic wave velocity and internal deformation of surrounding rock, the progressive deformation characteristics of the loosening area during different tunnel construction phases were tested. It was found that the loosening area gradually expands from 3 to 6 m, during the tunnel excavation using the bench method. The deformation growth is mainly caused by the internal deformation of surrounding rock in the loosening area.