摘要
深基坑施工会导致临近既有隧道的变形和附加应力,影响隧道的安全运营。以深基坑工程为依托,通过数值软件建立两种工况的基坑模型,分析了基坑与隧道距离对既有隧道竖向和水平位移的影响,确定基坑与隧道的安全距离。针对既有地铁隧道穿越双侧基坑的难点,遵循分区分块原则,提出了分区不对称开挖方案。通过现场监测,获取了基坑开挖完成后,既有隧道竖向变形和净空收敛沿隧道轴线的变形曲线。研究表明,随着基坑与隧道距离的增大,左右线隧道竖向和水平位移均出现不同程度的减小,基坑与隧道的安全距离为12 m;基坑施工对弯曲段隧道的变形影响大于直线段隧道。
The deep excavation construction can cause deformation and accessory stress near existing tunnels,affecting the safe operation of tunnels.This article is based on the deep excavation engineering and establishes excavation models for two working conditions by using a numerical software.The influence of the distance between the excavation and the tunnel on the vertical and horizontal displacement of the existing tunnel is analyzed,and the safe distance between the excavation and the tunnel is es-timated.In response to the difficulty of existing subway tunnels passing through deep excavations on both sides,a zoning and block based asymmetric excavation scheme is proposed,following the principle of zoning and block division.Through the on-site monitoring,the deformation curves of the existing tunnel's vertical deformation and clearance convergence along the tunnel axis were obtained after the deep excavation was completed.Research has shown that as the distance between the deep excava-tion and the tunnel increases,both the vertical and horizontal displacements of tunnels on both sides decrease to varying de-grees,especially during the process of increasing the distance from 10m to 12m.The safe distance between the deep excavation and the tunnel in this project is 12m;The impact of the excavation construction on the deformation of curved tunnels is greater than that of the straight tunnels.The research content of this article can provide a reference for similar projects.
作者
陈飞敏
CHEN Feimin(Jiangsu Vocational and Technical College of Architecture,Xuzhou 221116)
出处
《土工基础》
2025年第1期43-47,共5页
Soil Engineering and Foundation
关键词
双侧基坑
既有隧道
数值模拟
现场监测
变形分析
Deep Excavation on Both Sides
Existing Tunnels
Numerical Simulation
On Site Monitoring
Deformation Anal-ysis
