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Taking the intersection section of subway interval tunnel and high-speed railroad as the research object, the influence of subway interval tunnel construction on the settlement and deformation of the overlying high-speed railroad roadbed is analyzed by using three-dimensional finite difference method, and the results are compared with the calculation results of the unreinforced case to demonstrate the reinforcement effect of the high-speed railway roadbed reinforcement scheme. The results show that: (1) under the reinforced condition, the maximum settlement of the HSR roadbed is 6.47 mm and the maximum uneven settlement is 0.36 mm, which are 33.16% and 91.69% less than that of the unreinforced condition, respectively, and the settlement caused by the implementation of metro project is within the allowable deformation of HSR track; (2) without reinforcement of the stratum of the crossing section, the uneven settlement of the overlying railroad is caused by the middle section of the tunnel by shield excavation, and the roadbed at the top of the tunnel is not reinforced, and the uneven settlement of the overlying railroad is caused by the tunnel excavation. In the case of no reinforcement in the ground layer of the crossing section, the shield excavation causes uneven settlement of the railroad over the middle cross-section of the tunnel, the roadbed at the top of the tunnel forms a trough-like subsidence, and the roadbed at the top of the tunnel between the tunnels has a crest-like rise. The final settlement is larger in the tunnel that is excavated first, which has a “first to dig” effect. Under the effect of reinforcement measures, the maximum lateral settlement and maximum uneven settlement of the ground surface in the middle cross-section of the tunnel were significantly reduced, and the surface uplift phenomenon was eliminated. (3) Due to the deformation of the tunnel underneath, measures should be taken to reduce the speed of the railroad, reasonably determine the shield construction parameters and strengthen the monitoring and measurement during the construction of the shield tunnel through the crossing area.

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Three-Dimensional Numerical Analysis of the Effect of Subway Interval Tunnel Construction on the Settlement of High Speed Railroad Foundations

  • 会议论文

  • 发表日期：

    2025年

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  • Feng Ming Yue,
  • Li Wei

摘要

Taking the intersection section of subway interval tunnel and high-speed railroad as the research object, the influence of subway interval tunnel construction on the settlement and deformation of the overlying high-speed railroad roadbed is analyzed by using three-dimensional finite difference method, and the results are compared with the calculation results of the unreinforced case to demonstrate the reinforcement effect of the high-speed railway roadbed reinforcement scheme. The results show that: (1) under the reinforced condition, the maximum settlement of the HSR roadbed is 6.47 mm and the maximum uneven settlement is 0.36 mm, which are 33.16% and 91.69% less than that of the unreinforced condition, respectively, and the settlement caused by the implementation of metro project is within the allowable deformation of HSR track; (2) without reinforcement of the stratum of the crossing section, the uneven settlement of the overlying railroad is caused by the middle section of the tunnel by shield excavation, and the roadbed at the top of the tunnel is not reinforced, and the uneven settlement of the overlying railroad is caused by the tunnel excavation. In the case of no reinforcement in the ground layer of the crossing section, the shield excavation causes uneven settlement of the railroad over the middle cross-section of the tunnel, the roadbed at the top of the tunnel forms a trough-like subsidence, and the roadbed at the top of the tunnel between the tunnels has a crest-like rise. The final settlement is larger in the tunnel that is excavated first, which has a “first to dig” effect. Under the effect of reinforcement measures, the maximum lateral settlement and maximum uneven settlement of the ground surface in the middle cross-section of the tunnel were significantly reduced, and the surface uplift phenomenon was eliminated. (3) Due to the deformation of the tunnel underneath, measures should be taken to reduce the speed of the railroad, reasonably determine the shield construction parameters and strengthen the monitoring and measurement during the construction of the shield tunnel through the crossing area.