渗流-应力耦合作用下地铁车站基坑开挖变形特征研究  

Research on the Deformation Characteristics of Subway Station Foundation Excavation Construction Under the Seepage⁃stress Coupling Effect

作　　者：王宗理 WANG Zongli(China Railway 18th Bureau Group Municipal Engineering Co.,Ltd.,Tianjin 300350,China)

机构地区：[1]中铁十八局集团市政工程有限公司,天津300350

出　　处：《施工技术(中英文)》2025年第3期95-100,共6页Construction Technology

基　　金：中铁十八局集团有限公司科技创新项目。

摘　　要：为研究渗流-应力耦合作用下地铁车站基坑开挖变形特征,依托某地铁车站基坑工程,通过数值模拟计算方法,分析基坑周边地表竖向位移、基坑底部竖向位移、围护结构水平位移、钻孔灌注桩弯矩及钢支撑轴力变化特征。研究结果表明,在基坑开挖过程中,开挖深度越大,坑外地表沉降越大,围护结构水平位移越大,钻孔灌注桩最大弯矩越大,第2道钢支撑轴力越大;降水减小了基坑底部隆起、增大了基坑底部沉降,开挖增大了基坑底部隆起、减小了基坑底部沉降;地下连续墙长边中轴区域水平位移最大,应重点关注。实际施工时可通过增大基坑长边中部围护结构刚度或厚度,并适当增大第2道钢支撑材料刚度的方式,达到增强结构支护强度的目的。In order to study the deformation characteristics of subway station foundation excavation construction under the seepage⁃stress coupling effect,based on a subway station foundation excavation project,numerical simulation calculation methods were used to analyze the variation characteristics of the vertical displacement of the surrounding surface,the vertical displacement of the foundation excavation bottom,the horizontal displacement of the retaining structure,the bending moment of the drive cast⁃place⁃pile,and the steel support axial force.The research results show that during the foundation excavation construction,the greater the excavation depth,the greater the surface settlement outside the foundation excavation,the greater the horizontal displacement of the retaining structure,the greater the maximum bending moment of the drive cast⁃place⁃pile,and the greater the axial force of the second steel support.Dewatering reduced the uplift of the foundation excavation bottom and increased its settlement,while excavation increased the uplift of the foundation excavation bottom and reduced its settlement.The horizontal displacement of the central axis area on the long side of the underground continuous wall is the largest and should be given special attention.In actual construction,the purpose of enhancing the strength of structural support can be achieved by increasing the stiffness or thickness of the retaining structure in the middle of the long side of the foundation excavation,and appropriately increasing the stiffness of the second steel support material.

关 键 词：地铁车站 基坑 围护结构 渗流 沉降 

分 类 号：U231[交通运输工程—道路与铁道工程]