摘要
本工程为上海崇明越江通道长江隧道工程的长兴岛岸边段部分,该基坑开挖过程中地连墙变形多次出现预警情况。采用有限差分程序FLAC^(3D)对长兴岛工作井基坑的变形情况及稳定性进行了计算分析,并与现场监测结果进行对比,结合横支撑的极限承载力水平,综合评价了基坑的整体稳定性。同时,运用反分析的研究方法,采用有限元程序ANSYS计算了地连墙的极限位移值,探讨其变形偏大的原因,为现场施工作指导。
The project is part of the project of the oversea tunnel across the Yangtze River at Chongming Shanghai.It is at the shore of Changxing Island.The warning for the deformation of diaphragm walls had occurred repeatedly during the process of excavation.The deformation and stability of the working well of the foundation pit on Changxing Island were calculated and analyzed by use of the finite difference program FLAC^(3D),and compated with the site monitoring results a comprehensive evaluation of the overall stability of the pit from the aspect of the ultimate strength level of horizontal supporting was mode. Simultaneously,a back-analysis was made by using the finite element program to calculate the limit displacement of the diaphragm walls.The reason of the deformation was larger than expected was also discussed in order to make guidance for the field construction.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2008年第S1期100-104,共5页
Chinese Journal of Geotechnical Engineering
关键词
基坑
横支撑
极限承载力
极限位移
foundation pit
horizontal supporting
ultimate strength
limit of displacement
