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<p>To investigate the influencing factors of water inrush hazards during the mining process in the fault-bearing section of the southwestern Sanshandao Gold Mine, structural surface data was acquired using three–dimensional (3D) laser scanning. Numerical simulations were conducted using ABAQUS to analyze variations in stress, displacement, plastic zones, and pore water pressure under mining-induced conditions, with a particular focus on the impact of the F<sub>1</sub> fault on the − 165&#xa0;m level tunnel. The results indicate significant stress concentration at the seventh mining stage, with a maximum principal stress of 43.93&#xa0;MPa. Tunnel displacement increased progressively with mining advancement, with a maximum displacement of 2&#xa0;cm, reflecting an intensifying trend of surrounding rock deformation. Plastic deformation of the surrounding rock was most pronounced near the fault and backfill areas, with a maximum plastic strain of 6.195 × 10<sup>−3</sup>. Seepage field analysis revealed that water pressure increased with mining depth, especially in the fault zone, where water pressure dropped first and then rebounded. This trend suggests that the mining process exacerbates the instability of the seepage field. Regarding the − 165&#xa0;m tunnel roof, the principal stress near the fault zone gradually transitioned to tensile stress, accompanied by significant tensile stress concentration. The maximum roof displacement was 1.46&#xa0;cm, and water pressure exhibited intense fluctuations, demonstrating pronounced dynamic changes. Overall, the findings highlight that mining-induced stress redistribution and seepage field instability in fault-bearing submarine tunnels significantly influence tunnel stability. The F<sub>1</sub> fault plays a critical role in stress concentration and water pressure variations, posing potential risks for water inrush hazards.</p>

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Stability Assessment of Fault-Intersected Submarine Tunnels in the Southwestern Sanshandao Gold Mine

  • 期刊论文

  • 发表日期：

    2025年7月10日

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  • Jianshu Liu,
  • Zhuoying Tan,
  • Jiang Li,
  • Naigen Tan,
  • Yanshui Jiang,
  • Nuobei Zeng,
  • Aboubakar Siddique,
  • Yinglin Yang,
  • Linsen Xu,
  • Chenglu Hou,
  • Wei Li,
  • Zhijie Sun

摘要

To investigate the influencing factors of water inrush hazards during the mining process in the fault-bearing section of the southwestern Sanshandao Gold Mine, structural surface data was acquired using three–dimensional (3D) laser scanning. Numerical simulations were conducted using ABAQUS to analyze variations in stress, displacement, plastic zones, and pore water pressure under mining-induced conditions, with a particular focus on the impact of the F1 fault on the − 165 m level tunnel. The results indicate significant stress concentration at the seventh mining stage, with a maximum principal stress of 43.93 MPa. Tunnel displacement increased progressively with mining advancement, with a maximum displacement of 2 cm, reflecting an intensifying trend of surrounding rock deformation. Plastic deformation of the surrounding rock was most pronounced near the fault and backfill areas, with a maximum plastic strain of 6.195 × 10−3. Seepage field analysis revealed that water pressure increased with mining depth, especially in the fault zone, where water pressure dropped first and then rebounded. This trend suggests that the mining process exacerbates the instability of the seepage field. Regarding the − 165 m tunnel roof, the principal stress near the fault zone gradually transitioned to tensile stress, accompanied by significant tensile stress concentration. The maximum roof displacement was 1.46 cm, and water pressure exhibited intense fluctuations, demonstrating pronounced dynamic changes. Overall, the findings highlight that mining-induced stress redistribution and seepage field instability in fault-bearing submarine tunnels significantly influence tunnel stability. The F1 fault plays a critical role in stress concentration and water pressure variations, posing potential risks for water inrush hazards.