Scholarlink

In view of the safety issues of subway tunnel proximity construction, taking a subway station pit project as an example, through the analysis of in situ measured data, the deformation impact of deep foundation pit excavation on the adjacent existing subway tunnel and the surrounding soil was studied, and numerical simulation to study the control effect of setting isolation piles, increasing the rigidity of the support in the pit, and unloading the soil above the tunnel on the deformation of the adjacent tunnel caused by the excavation of the foundation pit was used. The study shows that setting isolation piles near the tunnel side can effectively reduce the tunnel displacement, and the length of isolation piles should at least cover the bottom range of the tunnel. The support in the pit within the elevation of the tunnel section has a greater impact on the tunnel deformation, and enhancing the stiffness of the support or increasing the number of the supports in this range can effectively control the deformation of the tunnel as well. Unloading of the soil above the tunnel also has a significant effect on the vertical displacement of the tunnel, and it is recommended to adopt graded unloading in several layers to avoid one-time and massive-quantity unloading during the construction process.

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Research on the Influence of Ultra-Deep Foundation Pit Excavation on Adjacent Existing Tunnels and Deformation Control

  • 章节

  • 出版模式：

    开放获取

  • 发表日期：

    2026年

查看全文
  • Youpeng Wen,
  • Mingxing Zhu,
  • Kunpeng Wu,
  • Xiaocong Liang,
  • Xiaozhou Yan

摘要

In view of the safety issues of subway tunnel proximity construction, taking a subway station pit project as an example, through the analysis of in situ measured data, the deformation impact of deep foundation pit excavation on the adjacent existing subway tunnel and the surrounding soil was studied, and numerical simulation to study the control effect of setting isolation piles, increasing the rigidity of the support in the pit, and unloading the soil above the tunnel on the deformation of the adjacent tunnel caused by the excavation of the foundation pit was used. The study shows that setting isolation piles near the tunnel side can effectively reduce the tunnel displacement, and the length of isolation piles should at least cover the bottom range of the tunnel. The support in the pit within the elevation of the tunnel section has a greater impact on the tunnel deformation, and enhancing the stiffness of the support or increasing the number of the supports in this range can effectively control the deformation of the tunnel as well. Unloading of the soil above the tunnel also has a significant effect on the vertical displacement of the tunnel, and it is recommended to adopt graded unloading in several layers to avoid one-time and massive-quantity unloading during the construction process.