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<p>Aiming to tackle the critical engineering challenge of stratum disturbance and structural deformation caused by shield tunneling in soft ground during the undercrossing of existing Line 2 Liyuan South Station by Ningbo Rail Transit Line 8, this study focuses on optimizing MJS (Metro Jet System) reinforcement material performance and applying horizontal annular reinforcement solutions. To quantitatively evaluate the influence of material parameters and reinforcement scope on deformation control, a combined approach of numerical simulation and field monitoring was adopted. The results show that for horizontal MJS reinforcement, deformation control relies on material property optimization, with priority given to adjusting elastic modulus and unit weight, which differs from vertical MJS that requires clarifying the relative position between the reinforced body and existing structures; when the outer diameter of MJS reinforcement, which has an optimized elastic modulus and unit weight, exceeds 9.5 meters, covering the shield’s primary disturbance area, the reduction rate of station track bed and surface settlement extremes increases significantly; field application of the optimized MJS material effectively mitigated vertical deformation that is the dominant impact of shield undercrossing, the maximum settlement of the upper track bed decreased from 5.18 to 4.52&#xa0;mm, and that of the lower track bed from 2.11 to 1.64&#xa0;mm, while horizontal deformation remained minimal and had no impact on track smoothness.</p>

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Performance Optimization of Metro Jet System Reinforcement Material and Its Control Effect on Deformation Induced by Shield Tunneling Underpassing Metro Station in Soft Soils

  • 期刊论文

  • 发表日期：

    2026年3月5日

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  • Siyao Liu,
  • Penghui Xue,
  • Kaifeng Zhou,
  • Chao Liu,
  • Hailong Zhang,
  • Zhuoran Zhou,
  • Yixian Wang

摘要

Aiming to tackle the critical engineering challenge of stratum disturbance and structural deformation caused by shield tunneling in soft ground during the undercrossing of existing Line 2 Liyuan South Station by Ningbo Rail Transit Line 8, this study focuses on optimizing MJS (Metro Jet System) reinforcement material performance and applying horizontal annular reinforcement solutions. To quantitatively evaluate the influence of material parameters and reinforcement scope on deformation control, a combined approach of numerical simulation and field monitoring was adopted. The results show that for horizontal MJS reinforcement, deformation control relies on material property optimization, with priority given to adjusting elastic modulus and unit weight, which differs from vertical MJS that requires clarifying the relative position between the reinforced body and existing structures; when the outer diameter of MJS reinforcement, which has an optimized elastic modulus and unit weight, exceeds 9.5 meters, covering the shield’s primary disturbance area, the reduction rate of station track bed and surface settlement extremes increases significantly; field application of the optimized MJS material effectively mitigated vertical deformation that is the dominant impact of shield undercrossing, the maximum settlement of the upper track bed decreased from 5.18 to 4.52 mm, and that of the lower track bed from 2.11 to 1.64 mm, while horizontal deformation remained minimal and had no impact on track smoothness.