城市密集区基坑开挖方式对邻近既有基础的影响分析  

Analysis on Infl uence of Foundation Pit Excavation Method on Adjacent Existing Foundation in Urban Dense Area

作　　者：莫永春 MO Yongchun(China Railway Group Limited,Beijing 100039,China)

机构地区：[1]中国中铁股份有限公司,北京100039

出　　处：《工程技术研究》2024年第15期48-50,共3页Engineering and Technological Research

摘　　要：文章依托邻近潮汕地区既有城际铁路桩基础的某地铁车站基坑工程,利用PLAXIS 3D数值模拟软件详细比较和分析了明挖顺作和盖挖逆作施工工况下深基坑开挖引起的邻近高架桥桩基变形规律,并探讨了车站基坑在两种工况下各施工阶段的车站主体结构变形特性。结果表明,基坑开挖引起的邻近桩基水平位移呈鼓肚状形式;相较于明挖法,逆作法施工引起邻近桩基的水平变形量减小约25%,因此,采用逆作法施工可降低对周边环境和交通的影响,同时在一定程度上减小结构变形。Based on the foundation pit engineering of a subway station adjacent to the existing intercity railway pile foundation in Chaoshan area,this paper uses PLAXIS 3D numerical simulation software to compare and analyze the deformation law of adjacent viaduct pile foundation caused by deep foundation pit excavation under the construction conditions of open cut construction method and cover and cut-top down construction method,and discusses the deformation characteristics of the main structure of the station in each construction stage under two working conditions.The results show that the horizontal displacement of adjacent pile foundation caused by foundation pit excavation is in the form of bulging belly;compared with the open cut construction method,the horizontal deformation of the adjacent pile foundation caused by the inverse construction method is reduced by about 25%.Therefore,the use of inverse construction method can reduce the influence on the surrounding environment and traffic,and reduce the structural deformation to a certain extent.

关 键 词：城市密集区 地铁施工 基坑开挖 盖挖逆作法 桩基变形 

分 类 号：TU753[建筑科学—建筑技术科学]