超深异型基坑开挖特性及支护优化——以南宁4号线大沙田站为例
Excavation Characteristics and Support Optimization of Extra-deep Special-shaped Foundation Pit:Taking Dashatian Station of Nanning Line 4 for Example
王建鹏1
作者信息
- 1. 中铁第六勘察设计院集团有限公司,天津市隧道设计与安全评估重点实验室,天津 300308
- 折叠
摘要
以某超深异型地铁车站基坑工程为依托,建立工程尺寸的数值模型预测基坑变形情况,提出变形控制措施.结合数值模拟及现场监测手段,分析基坑开挖过程中围护结构及支撑的受力变形机理,验证变形控制措施的可靠性.结果表明:围护结构最大水平位移出现在第4道支撑处约为0.65He(开挖深度);坑边地表沉降曲线呈"U"形分布,地表沉降与基坑围护结构水平位移呈正相关;原设计基坑变形过大,采取控制措施后基坑变形满足工程要求.
Abstract
Based on the foundation pit engineering of an ultra-deep special-shaped subway station,a numerical model of engineering size is established to predict the deformation of foundation pit,and deformation control measures are put forward.Combined with numerical simulation and field monitoring methods,the stress and deformation mechanism of different retaining structures and supports during foundation pit excavation is revealed,and the reliability of deformation control measures is verified.The results show that the maximum horizontal displacement of the envelope structure appears at the fourth support,which is about 0.65 He(excavation depth).The surface settlement curve around the pit is in a"U"shape,and the surface settlement is positively correlated with the horizontal displacement of the foundation pit retaining structure.The deformation of the original design foundation pit is too large,and the deformation of the foundation pit can meet the engineering requirements after taking control measures.
关键词
超深基坑/地铁车站/围护结构/数值模拟Key words
deep foundation pit/subway station/support structure/numerical simulation引用本文复制引用
基金项目
中国中铁科技开发计划(2021-重大-13)
出版年
2024
NETL
NSTL
万方数据