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This paper focuses on the water inrush issue in the fault fracture zone of Ankang Tunnel of Xikang High-Speed Railway and conducts research on the grouting reinforcement method. The tunnel traverses the complex geological area of Qinling Mountains, especially the intersection section with the Zaoshu Pian Fault, where the rock mass is severely fractured and the water inflow is large, posing challenges to the construction. Through a comprehensive analysis of the engineering geological characteristics of the tunnel, including topography, climate, stratigraphic lithology and hydrogeological conditions, the geological environment of the water inrush section is revealed. On this basis, this paper proposes an advanced grouting reinforcement scheme for the upper half section, using sulphoaluminate cement as the grouting material, with a grouting distance set at 25 m and the grouting pressure controlled within 5–7 MPa. To verify the grouting effect, three monitoring sections are set up in the reinforced tunnel section to monitor the rock stress and the vault displacement. The monitoring data show that the rock stress and the displacement after grouting are relatively concentrated in the middle area of the tunnel, with the maximum surrounding rock pressure reaching 382 kPa and the maximum vault displacement being 66.4 mm. The analysis points out that the seepage channels and cavities formed after water inrush in the middle area lead to uneven diffusion of the grouting slurry, poor combination effect between the slurry and the geotechnical body, and the formation of isolated coagulation bodies, which affect the reinforcement effect. Therefore, for shallow-buried tunnels in water-rich fault fracture zones, this paper suggests that advanced grouting be carried out before the occurrence of water inrush disasters to improve the uniformity of slurry diffusion and enhance the grouting reinforcement effect of the surrounding rock. This research provides technical reference and practical guidance for similar projects and has important engineering application value.

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Water Inrush Control and Effect Evaluation of Weak Fault Fracture Zones in Fushui High-Speed Railway Tunnel

  • 会议论文

  • 发表日期：

    2025年

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  • ZhongQiang Yi,
  • Xiaoqiang Lv,
  • Haiping Jiao,
  • Ruikai Duan,
  • Xufeng Shi,
  • Honggang Wu

摘要

This paper focuses on the water inrush issue in the fault fracture zone of Ankang Tunnel of Xikang High-Speed Railway and conducts research on the grouting reinforcement method. The tunnel traverses the complex geological area of Qinling Mountains, especially the intersection section with the Zaoshu Pian Fault, where the rock mass is severely fractured and the water inflow is large, posing challenges to the construction. Through a comprehensive analysis of the engineering geological characteristics of the tunnel, including topography, climate, stratigraphic lithology and hydrogeological conditions, the geological environment of the water inrush section is revealed. On this basis, this paper proposes an advanced grouting reinforcement scheme for the upper half section, using sulphoaluminate cement as the grouting material, with a grouting distance set at 25 m and the grouting pressure controlled within 5–7 MPa. To verify the grouting effect, three monitoring sections are set up in the reinforced tunnel section to monitor the rock stress and the vault displacement. The monitoring data show that the rock stress and the displacement after grouting are relatively concentrated in the middle area of the tunnel, with the maximum surrounding rock pressure reaching 382 kPa and the maximum vault displacement being 66.4 mm. The analysis points out that the seepage channels and cavities formed after water inrush in the middle area lead to uneven diffusion of the grouting slurry, poor combination effect between the slurry and the geotechnical body, and the formation of isolated coagulation bodies, which affect the reinforcement effect. Therefore, for shallow-buried tunnels in water-rich fault fracture zones, this paper suggests that advanced grouting be carried out before the occurrence of water inrush disasters to improve the uniformity of slurry diffusion and enhance the grouting reinforcement effect of the surrounding rock. This research provides technical reference and practical guidance for similar projects and has important engineering application value.