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<p>The construction of underground structures by deep excavation adjacent to existing metro tunnels generates additional stresses on the tunnels, which lead to deformation, stepping, and opening of circumferential joints, causing tunnel failure. This paper examines the shielding effect of the first tunnel on the second tunnel, considering the Pasternak soil model. The deformation and forces on the second tunnel have been determined, considering the shielding effect due to the presence of the first tunnel. The governing differential equation has been solved by the Finite Difference Method. The shielding effect of the first tunnel on the second tunnel has been compared with previous literatures and by two-dimensional and three-dimensional finite element models and is found to be in good agreement. It has been found that the deflection and bending moment of the second tunnel reduce considerably due to the shielding effect of the first tunnel. Again, due to consideration of soil non-linearity, the deflection and forces in both tunnels increase. Hence, as a risk mitigation measure, a temporary steel bracing system may be installed inside the tunnels during adjacent deep excavation.</p>

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Shielding Effect Between Tunnels Subjected to Ground Deformation Due to Adjacent Deep Excavation by the Linear and Non-Linear Pasternak Model

  • 期刊论文

  • 发表日期：

    2026年1月30日

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  • Debjyoti Kar,
  • Ambarish Ghosh

摘要

The construction of underground structures by deep excavation adjacent to existing metro tunnels generates additional stresses on the tunnels, which lead to deformation, stepping, and opening of circumferential joints, causing tunnel failure. This paper examines the shielding effect of the first tunnel on the second tunnel, considering the Pasternak soil model. The deformation and forces on the second tunnel have been determined, considering the shielding effect due to the presence of the first tunnel. The governing differential equation has been solved by the Finite Difference Method. The shielding effect of the first tunnel on the second tunnel has been compared with previous literatures and by two-dimensional and three-dimensional finite element models and is found to be in good agreement. It has been found that the deflection and bending moment of the second tunnel reduce considerably due to the shielding effect of the first tunnel. Again, due to consideration of soil non-linearity, the deflection and forces in both tunnels increase. Hence, as a risk mitigation measure, a temporary steel bracing system may be installed inside the tunnels during adjacent deep excavation.