不同开挖顺序下分离式基坑施工相互影响研究  

Study on mutual influence of separated foundation pit construction under different excavation sequences

作　　者：陈慧鸽 CHEN Huige(The 4th engineering Co.,Ltd.of China Railway 12th bureau group,Xi’an 710021,China)

机构地区：[1]中铁十二局集团第四工程有限公司,陕西西安710021

出　　处：《四川建材》2025年第2期110-112,121,共4页Sichuan Building Materials

基　　金：江西省防灾减灾及应急管理重点实验室项目(20212BCD42011)。

摘　　要：分离式基坑施工在城市建设中广泛应用,其施工顺序对基坑内部土体变形的影响备受关注。基于此,以江西省南昌某高铁与地铁分离式基坑工程为背景,采用三维有限元软件PLAXIS 3D模拟开挖过程,探究不同开挖顺序下分离式基坑工程施工引起的周围土体及围护结构变形规律。结果表明,坑间地表沉降受基坑挖深和施工顺序影响显著,基坑先后施工不利于控制后开挖基坑周边土体沉降;基坑先后施工对非相邻侧围护桩水平位移影响不大,但可以明显减小后开挖基坑相邻侧围护桩的变形。在分离式基坑施工中优先考虑交叉施工顺序,其次是先开挖挖深较大一侧的基坑。The construction of separated foundation pits is common in urban projects,and how excavation sequence affects soil deformation is a key concern.Using PLAXIS 3D to simulate a high-speed railway and subway project in Nanchang,we studied how different excavation sequences impact soil and retaining structures.Results indicate that surface settlement between pits is strongly influenced by excavation depth and sequence,with successive excavation leading to increased settlement around the pits.While excavation has minimal effect on the horizontal displacement of non-adjacent retaining piles,it significantly reduces deformation of adjacent piles.Prioritizing cross-construction and excavating the deeper pit first is recommended.

关 键 词：分离式基坑 数值模拟 开挖顺序 变形 

分 类 号：TU753[建筑科学—建筑技术科学]