地下轨道交通超深基坑的沉降变形数值模拟研究  

Numerical Simulation Study on Settlement and Deformation of Ultra-Deep Foundation Pit for Underground Rail Transit

作　　者：狄春锋 DI Chunfeng

机构地区：[1]中铁建设集团有限公司,广东汕头515054

出　　处：《重庆建筑》2025年第3期82-85,共4页Chongqing Architecture

摘　　要：基于汕头高铁站枢纽一体化轨道交通预留工程(一期)深大基坑工程,使用有限元分析软件ABAQUS对深基坑的开挖过程及其支护结构的受力性能进行了数值仿真模拟。计算了在不同开挖步骤下,地下连续墙的变形情况、侧移量以及地表沉降量。结果显示,基坑支护结构的侧向变形行为表现出明显的三维空间效应。随着基坑开挖深度不断增加,地下连续墙向坑内发生侧移。在达到最大开挖深度的0.55处时,出现最大位移,其最大值约为9.1 mm。并且,随着基坑开挖深度的加深,地表沉降量也逐渐增大。尤其是在第三次开挖过程中,由于开挖深度较深,且当时缺乏有效的支护措施,致使地表沉降量大幅上升,最大沉降量达到了22 mm。因此,在施工过程中需及时采取增强支护措施,以防止因开挖导致的过度沉降,从而保障结构的安全性和功能的正常使用。Based on the deep and large foundation pit project of the reserved works for integrated rail transit at the Shantou High-Speed Railway Station Hub(Phase I),numerical simulation of the excavation process of the deep foundation pit and the mechanical performance of its supporting structure was conducted using the finite element analysis software ABAQUS.The deformation,lateral displacement of the diaphragm wall,and surface settlement were calculated at different excavation stages.The results show that the lateral deformation behavior of the foundation pit supporting structure exhibits significant three-dimensional spatial effects.As the excavation depth of the foundation pit increases,the diaphragm wall shifts laterally towards the pit.The maximum displacement occurs at 0.55 times the maximum excavation depth,with a maximum value of approximately 9.1 mm.Furthermore,as the excavation depth of the foundation pit deepens,the surface settlement gradually increases.Especially during the third excavation stage,due to the deep excavation depth and the lack of effective supporting measures at that time,the surface settlement increased significantly,reaching a maximum settlement of 22 mm.Therefore,it is necessary to timely implement reinforced supporting measures during the construction process to prevent excessive setlement caused by excavation,thereby ensuring the safety and functional integrity of the structure.

关 键 词：地下轨道交通 深大基坑 ABAQUS 地下连续墙 侧向变形 沉降量 

分 类 号：U213.2[交通运输工程—道路与铁道工程]