北京丰台站改扩建项目分期施工沉降变形分析  

The Phased Construction Settlement Analysis of Beijing Fengtai Station Reconsruction and Expansion Project

作　　者：王媛[1] 李伟强[1] 唐虎 Wang Yuan;Li Weiqiang;Tang Hu(Beijing Institute of Architectural Design Co.,Ltd.,Beijing 100045,China;China Railway Design Group Co.,Ltd.,Tianjin 300308,China)

机构地区：[1]北京市建筑设计研究院有限公司,北京100045 [2]中国铁路设计集团有限公司,天津300308

出　　处：《岩土工程技术》2024年第4期420-426,共7页Geotechnical Engineering Technique

摘　　要：为确保丰台站改扩建施工期间既有铁路运输线不受影响,项目划分为3个施工区域,分两期先后施工,并于分期施工衔接部位设置了沉降后浇带。车站主体以现浇混凝土框架结构为主,后浇带的存在严重制约后期施工进度。为此,采用有限元计算软件PLAXIS3D对地层、结构及施工步序精细化建模,进行上部结构-基础-地基的协同沉降变形计算分析。分析结果显示,后浇带两侧因后期施工引起的差异沉降满足规范及设计要求,据此取消了沉降后浇带,为保证施工工期创造了条件。项目沉降监测数据及运行状况表明协同分析预测结果可靠,可供类似工程参考。During the construction period,it is necessary to ensure that the existing railway transportation line that originally passed through here was not affected.The project of Fengtai station reconstruction was divided into three phases of construction,and construction was carried out in two phases in sequence and post-cast strips were set up at the junction of the phased construction.Due to the station's main structure consisting mainly of cast-in-place concrete frame structures,the presence of post-cast strips has a significant impact on the progress of subsequent construction.Based on the deformation calculation analysis of the superstructure-foundationsoil,a refined modeling of the strata,structure,and construction steps was carried out.The results show that the differential settlement caused by the later construction on both sides of the settlement post pouring belt meets the specifications and design requirements.The settlement post-cast strips were cancelled and created conditions to ensure the construction period.Verified by settlement measurement data,the numerical calculation prediction results are reliable,and this method can be used as a reference for similar projects.

关 键 词：沉降后浇带 沉降计算分析 差异沉降 沉降监测数据 

分 类 号：TU470[建筑科学—结构工程]