不同嵌固深度地连墙基坑开挖降水变形特征分析  

Analysis of Deformation Characteristics during Excavation and Dewatering of Foundation Pits with Different Embedded Depths of Diaphragm Walls

作　　者：赵新存 ZHAO Xincun

机构地区：[1]中铁建设集团南方工程有限公司,广东广州511455

出　　处：《重庆建筑》2025年第4期76-79,共4页Chongqing Architecture

摘　　要：为探讨降水和开挖两种因素如何共同影响基坑的变形和受力情况,以汕头高铁站的基坑降水为研究背景,采用有限元分析软件ABAQUS,分析了在不同地连墙嵌固深度条件下,基坑在降水和挖掘过程中的变形特性。研究发现,随着基坑挖掘深度的逐渐增加,基坑周围的土壤会出现不同程度的下沉,特别是在基坑的中心区域会出现隆起的情况。随着地连墙嵌固深度的增加,第4次开挖后坑底的隆起量也逐渐减少。基坑开挖的水平位移图展现了两边的对称特性且最大的水平位移主要集中在基坑顶部墙体的附近,随着距离的增加,基坑外部的土体水平位移逐步减少。随着嵌固深度的增加,20 m和25 m的两侧土体水平位移相同,但是到30 m时,两侧的水平位移的量会减小。To investigate how dewatering and excavation jointly influence the deformation and stress conditions of foundation pits,this study takes the foundation pit dewatering at the Shantou Highspeed Railway Station as the research background.Using finite element analysis software ABAQUS,the deformation characteristics of the foundation pit during dewatering and excavation under different embedded depths of diaphragm walls were analyzed.The study found that as the excavation depth of the foundation pit increases,varying degrees of soil settlement occur around the pit,with uplift particularly noticeable in the central area of the pit.As the embedded depth of the diaphragm wall increases,the uplift at the pit bottom after the fourth excavation gradually decreases.The horizontal displacement map of the foundation pit excavation exhibits symmetrical characteristics on both sides,with the maximum horizontal displacement concentrated near the top wall of the pit.As the distance from the pit increases,the horizontal displacement of the soil outside the pit gradually decreases.With increasing embedded depth,the horizontal displacement of the soil on both sides is the same at 20 m and 25 m,but decreases at 30 m.

关 键 词：地连墙深度 分层施工 变形特征 数值模拟 

分 类 号：U414[交通运输工程—道路与铁道工程] TV52[水利工程—水利水电工程]