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<p>The impact of constructing new tunnels underneath existing tunnels has long been a topic of significant interest, particularly in the complex scenario of multi-tunnel construction. This study focuses on the Dongfengshan drilling-and-blasting project of a four-hole parallel tunnel underneath an existing tunnel in Fuzhou City. A three-dimensional (3D) finite element model was developed for the underpass section by utilizing the Midas GTS 3D finite element simulation software. The rock mass stresses during the construction of the new 4-hole parallel tunnel were investigated, and effects of varying displacements on the existing tunnel were examined. The findings indicated that the maximum compressive stress in the rock mass after the excavation of the new tunnels was always less than the uniaxial saturated compressive strength of the rock mass, ensuring the overall stability of the tunnels. The maximum settlement at the vault was 6.83&#xa0;mm, while the existing left and right tunnels experienced maximum settlements of 3.3&#xa0;mm and 3.47&#xa0;mm, respectively, which were all within the specified design limits. Based on the numerical simulation results, this study proposed relevant disturbance control measures to offer valuable insights for similar engineering projects.</p>

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Numerical Analysis of Disturbance Control in a Four-Hole Parallel Tunnel Crossing Beneath Existing Tunnels

  • 期刊论文

  • 发表日期：

    2025年1月3日

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  • Wei Huang,
  • Wen Liu,
  • Min-Tao Ou,
  • Lu Zhao

摘要

The impact of constructing new tunnels underneath existing tunnels has long been a topic of significant interest, particularly in the complex scenario of multi-tunnel construction. This study focuses on the Dongfengshan drilling-and-blasting project of a four-hole parallel tunnel underneath an existing tunnel in Fuzhou City. A three-dimensional (3D) finite element model was developed for the underpass section by utilizing the Midas GTS 3D finite element simulation software. The rock mass stresses during the construction of the new 4-hole parallel tunnel were investigated, and effects of varying displacements on the existing tunnel were examined. The findings indicated that the maximum compressive stress in the rock mass after the excavation of the new tunnels was always less than the uniaxial saturated compressive strength of the rock mass, ensuring the overall stability of the tunnels. The maximum settlement at the vault was 6.83 mm, while the existing left and right tunnels experienced maximum settlements of 3.3 mm and 3.47 mm, respectively, which were all within the specified design limits. Based on the numerical simulation results, this study proposed relevant disturbance control measures to offer valuable insights for similar engineering projects.