基坑开挖对既有地铁隧道变形的影响研究
DOI:
作者:
作者单位:

作者简介:

杨坡(1990—),男,北京城建勘测设计院有限责任公司工程师

通讯作者:

中图分类号:

TU47

基金项目:

江苏省常州市科技局科技支撑计划项目(CE20185014)


Study on effects of foundation pit excavation on the deformation of existing metro tunnel
Author:
Affiliation:

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    为研究基坑开挖对下穿既有地铁隧道变形的影响,考虑土体的小应变刚度,建立了有限元模型,模拟了基坑开挖过程,研究竖向开挖卸荷对下覆隧道变形的影响规律,分析不同开挖深度时下覆隧道的变形特性和变形影响区域,对比了不同基坑土体加固措施对隧道变形的控制效果。研究结果表明:竖向卸载主要引起隧道的竖向变形,坑底隆起,隧道竖向变形和影响区范围随着开挖深度的降低而减小,建议基坑土体加固平面上选择满堂加固,竖向上选择回掺式加固,基坑土体加固强度宜为0.5~1.5 MPa。

    Abstract:

    To study the influence of foundation pit excavation on the deformation of existing metro tunnel,the finite element method considering the small strain of soil was adopted to simulate the excavation process. The influence of vertical excavation unloading on the deformation of the underlying tunnels was studied. Besides,the deformation characteristics and the influenced zone of the tunnels were analyzed with different excavation depths. The controlling effects of different soil reinforcement measures on tunnel deformation were compared. The results show that the vertical unloading mainly causes the vertical deformation of tunnels,with the decrease of the excavation depth,the vertical deformation of tunnel and the influenced zone are decreased. It is suggested that the entire basal soil reinforcement selected for the soil reinforcement of foundation pit in horizontal plane, and the back tail reinforcement is selected in vertical plane. The proper strength of soil reinforcement for foundation pit is between 0.5 and 1.5 MPa.

    参考文献
    相似文献
    引证文献
引用本文
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:
  • 最后修改日期:
  • 录用日期:
  • 在线发布日期: 2022-06-06
  • 出版日期: