摘要
基坑施工对邻近的地铁结构会产生扰动影响,文中依托某邻近地铁车站、区间隧道及出入口的基坑工程,建立了整体开挖、两种不同分区开挖的三维有限元模型,分析3个方案下地铁结构的水平位移、竖向位移变化特征。研究结果表明,车站、区间位移以向基坑方向的水平位移为主;分区开挖相对整体开挖对地铁影响小,分区开挖方案中,开挖至二层后先北基坑再南基坑方案为最优方案;地铁位移主要发生在开挖阶段,结构施工阶段位移有所减小;车站和区间接口位置受基坑施工影响明显。研究结论可为同类型地质条件工程提供借鉴与参考。
Excavation of foundation pits can significantly disturb adjacent metro structures.This study,based on the foundation pit engineering near a metro station,a section tunnel,and entrances,establishes three-dimensional finite element models for overall excavation and two different segmented excavation methods.It analyzes the horizontal and vertical displacement characteristics of the metro structures under these three scenarios.The results show that the horizontal displacement towards the foundation pit is predominant in both the station and tunnel sections.Compared to overall excavation,segmented excavation has a lesser impact on the metro structures.Among the segmented excavation schemes,the optimal approach involves excavating the north pit first followed by the south pit after reaching the second layer.Displacements are primarily observed during the excavation phase and are reduced during the structural construction phase.The interface between the station and tunnel experiences significant impact from the foundation pit excavation.These conclusions provide valuable insights and references for similar engineering projects under comparable geological conditions.
作者
龚云强
张委定
杨巧玲
GONG Yunqiang;ZHANG Weiding;YANG Qiaoling(North China Municipal Engineering Design and Research Institute Co.,Ltd.,Tianjin 300074,China;Tianjin Municipal Engineering Design and Research Institute Co.,Ltd.,Tianjin 300051,China;Tianjin Tianshi College,Tianjin 301700,China)
出处
《低温建筑技术》
2024年第9期91-95,共5页
Low Temperature Architecture Technology
关键词
软土基坑
施工扰动影响
三维有限元模型
soft soil foundation pit
construction disturbance
3D FEM model
