高架桥桥基与地下车站深基坑近距离施工相互影响分析  

Interaction Analysis of Adjacent Construction Between High-Speed Railway Bridge Foundation and Deep Underground Station Pit

作　　者：周超 丁春林[1] 李桂颖 朱海星 Zhou Chao;Ding Chunlin;Li Guiying;Zhu Haixing(Key Laboratory of Road and Traffic Engineering of the Ministry of Education,Tongji University,Shanghai 201804,China;The Fourth Engineering Co.,Ltd.,of CTCE Group,Hefei 230000,China)

机构地区：[1]同济大学道路与交通工程教育部重点实验室,上海201804 [2]中铁四局集团第四工程有限公司,安徽合肥230012

出　　处：《华东交通大学学报》2023年第3期10-16,共7页Journal of East China Jiaotong University

基　　金：中铁四局集团第四工程有限公司科研项目(20210716)。

摘　　要：基于某地下车站深基坑与高架桥桥基近距离施工难题,利用Midas GTS NX软件,土体采用修正摩尔库伦本构模型,对基坑开挖、桥基施工、支撑拆除以及车站主体结构回筑进行施工全过程数值模拟,分析施工全过程基坑和桥基的相互影响规律,并结合现场实测数据对数值模拟结果进行对比验证。研究发现,基坑开挖阶段,由于土体水平卸荷,基坑变形不断增大,基坑地表最大沉降发生在距基坑边缘约0.4倍基坑宽度处,地连墙最大侧移发生靠近基底处;桥基施工后,基坑地表沉降和地下连续墙侧向位移进一步增加,桥基本身也产生了一定沉降;基坑支撑拆除和车站主体结构回筑阶段,由于围护结构的作用,基坑和桥基的变形增长并不明显。Based on the problem of adjacent construction of overpass bridge foundation and deep foundation pit of the underground station,this paper carried out a finite element numerical simulation of the whole construction process with Midas GTS NX where modified Mohr-Coulomb constitutive model was adapted on the soil,including foundation pit excavation,bridge foundation construction and braces demolition,to study the pattern of interaction between the bridge foundation and the underground station foundation pit.Having compared the numerical simulation results with on-site measured data,the results showed that,during the excavation stage of the foundation pit,the deformation of the foundation pit continued to increase due to the horizontal unloading of the soil.The maximum settlement occurred at about 0.4 times the width of the foundation pit from the edge of it,and the maximum displacement of diaphragm wall occurred near the bottom of foundation pit.After the construction of the overpass bridge foundation,the surface settlement of the foundation pit and the lateral displacement of the diaphragm wall further increased,and the overpass bridge itself also had a modicum settlement.Thanks to the protection of the enclosure structure,the impact of the braces demolition was neither obvious on the pit nor the overpass bridge foundation.

关 键 词：软土地层 高架桥桥基 地铁深基坑 近距离施工 相互影响 数值模拟 

分 类 号：U452[建筑科学—桥梁与隧道工程]