深基坑开挖对邻近轨道运营交通结构的影响分析  

Analysis of the Impact of Deep Excavation on Adjacent Rail Transit Structures

作　　者：安邦超 姜波 罗谢辉 曹俊 AN Bangchao;JIANG Bo;LUO Xiehui;CAO Jun(Guizhou Transportation Planning Survey and Design Academe Co.,Ltd.,Guiyang 550001,China;Guiyang Metro Real Estate Co.,Ltd.,Guiyang 550081,China)

机构地区：[1]贵州省交通规划勘察设计研究院股份有限公司,贵阳550001 [2]贵阳地铁置业有限公司,贵阳550081

出　　处：《交通科技》2024年第6期109-115,共7页Transportation Science & Technology

摘　　要：为了解深大基坑开挖对邻近既有轨道结构及电塔的影响,针对性采取变形控制措施。文中依托工程实例,采用考虑土体双硬化特性的修正摩尔-库仑本构模型构建“基坑+路基+高架桥+电塔”三维动、静力精细化分析模型,揭示基坑在有、无支护条件下的开挖变形规律:提出邻近轨道深基坑开挖影响范围为4倍的基坑开挖深度,建议类似工程的轨道交通安全保护区范围为轨道结构外边线外侧4倍基坑开挖深度;基坑侧土体受桥梁桩基阻拦作用桩侧的土体变形小于桩间土,反之桥梁桩基受土体附加应力影响,需加强设计;基于邻近轨道基坑变形控制提出了“排桩+锚索”支护形式,能极大程度控制基坑开挖对周边环境的扰动,确保轨道营运安全。In order to understand the influence of deep foundation pit excavation on adjacent existing track structure and electric tower,the deformation control measures were taken.Based on engineering examples,a three-dimensional dynamic and static fine analysis model of foundation pit,subgrade,viaduct and electric tower is simultaneously constructed by using the modified Mohr-Coulomb(MM-C)constitutive model with considering the double-hardening characteristics of soil,to reveal the excavation deformation law of foundation pit under the conditions of with and without support.The influence range of deep foundation pit excavation is proposed to be 4 times the depth of foundation pit excavation.It is suggested that the safety protection zone for similar rail transit projects should be 4 times the excavation depth of the foundation pit outside the outer edge of the track structure.The deformation of the soil on the side of the foundation pit under the obstruction of the bridge pile foundation is smaller than that of the soil between the piles.Conversely,the bridge pile foundation is affected by the additional stress of the soil,and the design needs to be strengthened.Based on the deformation control of adjacent track foundation pits,a support form of row pile with anchor cable is proposed,which can greatly control the disturbance of excavation to the surrounding environment and ensure the safety of track operation.

关 键 词：深基坑开挖 轨道交通 数值仿真 影响分析 

分 类 号：U459.1[建筑科学—桥梁与隧道工程]