铁路与建筑中间基坑开挖土体变形特征研究  

Soil Deformation of a Deep Excavation Between a Railway and Buildings

作　　者：李金池 石和杰 LI Jinchi;SHI Hejie(China Railway Construction Corporation Harbor and Channel Engineering Bureau Group Co.Ltd.,Wuhan 430013)

机构地区：[1]中国铁建港航局集团有限公司武汉分公司,武汉430013

出　　处：《土工基础》2024年第5期832-835,共4页Soil Engineering and Foundation

基　　金：中国铁建港航局集团有限公司科技研发计划项目(2023-C44);中国铁建港航局集团有限公司科技研发计划项目(2024-A09)。

摘　　要：为了研究城市复杂环境下基坑开挖导致周围土体及支护结构的变形问题,以武汉市某基坑工程项目为例,采用有限元软件PLAXIS2D模拟基坑的开挖过程,对基坑支护结构、邻近铁路列车荷载和既有建筑产生的荷载进行合理的简化,分析了基坑区域土体和支护结构的变形。分析结果表明,基坑开挖过程中,靠近铁路侧的基坑支护结构的最大变形大于既有建筑侧的支护结构,土体发生的最大垂直位移发生在基坑正中间处,最大水平位移发生在靠近基坑侧铁路路基斜坡处,其支护结构变形与土体变形均满足相关规范要求。This paper presents a case history of investigating the deformation of the surrounding soil and the supporting structures caused by the deep excavation in complex urban environments in Wuhan.The deep excavation is simulated by using the commercial finite element software PLAXIS2D.The excavation supporting structures as well as the loads imposed by adjacent railway trains and existing buildings,are reasonably simplified.The deformation of the soil mass and supporting structures within the excavation area are analyzed.The results indicate that,during the excavation process,the maximum deformation of in supporting structures adjacent to the railway side is greater than that on the side of existing buildings.The maximum vertical displacement of the soil occurs at the center of the excavation,while the maximum horizontal displacement takes place at the slope of the railway subgrade close to the excavation side.Both the deformation of the supporting structures and the soil deformation meet the relevant regulatory requirements.

关 键 词：临铁基坑开挖 PLAXIS2D基坑模拟 基坑支护 基坑变形分析 

分 类 号：TU473[建筑科学—结构工程]