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<p>In densely built urban environments, the construction of new subway tunnels increasingly involves complex interactions with adjacent underground structures, including newly constructed tunnels. This study investigates the deformation behavior and disturbance mechanisms of two overlapping newly built shield tunnels, Suzhou Metro Line 8 (underpass) and Line 6 (overpass), using a 3D numerical model developed in MIDAS GTS NX. Four tunneling sequences (working conditions) are simulated, and the resulting surface settlements and segment deformations are compared. Among them, working Condition 4, which involves sequential excavation of the left Line 8, left Line 6, right Line 6, and right Line 8, demonstrates optimal control of ground and structural deformation, with a maximum surface settlement of 24&#xa0;mm, and segment convergence and settlement are controlled within 2–3&#xa0;mm. Reinforcement strategies, including internal support for the underpass tunnel and segment strengthening for the overpass tunnel, are proposed and implemented. Field monitoring confirms the effectiveness of the proposed plan, with the maximum settlement and deformation values aligning with the simulation results and remaining below the technical thresholds. The findings provide practical insights and guidance for safely managing construction risks in overlapping shield tunnel projects.</p>

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Numerical Insights into Ground Disturbance and Control Measures in Vertically Stacked Twin Shield Tunneling

  • 期刊论文

  • 发表日期：

    2025年8月21日

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  • Fei Yan,
  • Yongtao Gao,
  • Changfu Huang,
  • Peng Li,
  • Tianhua Wu,
  • Bowen Pei,
  • Jianwang Li,
  • Yu Zhou

摘要

In densely built urban environments, the construction of new subway tunnels increasingly involves complex interactions with adjacent underground structures, including newly constructed tunnels. This study investigates the deformation behavior and disturbance mechanisms of two overlapping newly built shield tunnels, Suzhou Metro Line 8 (underpass) and Line 6 (overpass), using a 3D numerical model developed in MIDAS GTS NX. Four tunneling sequences (working conditions) are simulated, and the resulting surface settlements and segment deformations are compared. Among them, working Condition 4, which involves sequential excavation of the left Line 8, left Line 6, right Line 6, and right Line 8, demonstrates optimal control of ground and structural deformation, with a maximum surface settlement of 24 mm, and segment convergence and settlement are controlled within 2–3 mm. Reinforcement strategies, including internal support for the underpass tunnel and segment strengthening for the overpass tunnel, are proposed and implemented. Field monitoring confirms the effectiveness of the proposed plan, with the maximum settlement and deformation values aligning with the simulation results and remaining below the technical thresholds. The findings provide practical insights and guidance for safely managing construction risks in overlapping shield tunnel projects.