摘要
以青岛地铁5号线澳柯玛桥站为研究对象,通过有限元软件建立三维模型,分析基坑开挖以及对车站既有段和邻近桥桩的变形影响。结果表明:外挂基坑水平位移大于主体基坑,水平位移由X方向主导,建议对整体基坑进行合理分段、分层,多工作面开挖;桥桩的水平位移变形较小,最大值出现在桥桩顶部,桥桩变形后传至上部土体会产生放大效应;车站既有段的竖向位移较水平位移明显,主要表现为沉降,最大值出现在既有段的拱顶处,建议施工中着重注意车站既有段的沉降变化。
This study focuses on Aucma Bridge Station of Qingdao Metro Line 5,utilizing a three-dimensional finite element model to investigate the effects of foundation pit excavation on the deformation of the existing station section and adjacent bridge piles.The findings reveal that the horizontal displacement of the attached foundation pit exceeds that of the main pit,with the X-direction being the dominant factor.It is recommended to excavate the entire foundation pit in a rational sequence of sections,layers,and multiple working faces.The horizontal displacement of the neighboring bridge piles is minimal,with the peak occurring at the pile tops,and the deformation of the piles amplifies when transmitted to the overlying soil.The vertical displacement of the existing station section is more pronounced than the horizontal,primarily resulting in settlement,with the maximum value located at the arch crown.Therefore,special attention should be given to the settlement of the existing station section during construction.
作者
杨士杰
张鑫
郭春来
杨科
魏婷
YANG Shijie;ZHANG Xin;GUO Chunlai;YANG Ke;WEI Ting(China Railway No.3 Engineering Group Co.,Ltd.,The Forth Engineering Co.,Ltd.,Beijing 102300,China)
出处
《建筑施工》
2024年第7期1022-1025,共4页
Building Construction
基金
中铁三局集团有限公司科研项目(20220601)。
关键词
明暗挖结合
地铁车站
基坑开挖
数值模拟
combination of surface and underground excavation
subway station
foundation pit excavation
numerical simulation
