T型换乘地铁车站续建基坑开挖对运营结构的影响分析及对策

摘要

The cutting of the foundation pit of a T-shaped transfer Metro station will have unbalanced pressure on the existing Metro structure.In the paper,numerical analysis is made on the deformation of the existing Metro structure caused by the cutting of the foundation pit of a T-shaped transfer Metro station by means of Plaxis finite element program,so as to protect the existing Metro structure and to ensure that the deformation of the existing structure can meet the operation requirements.The study,which shows that open cutting can be adopted for the foundation pit of the T-shaped transfer Metro station,can provide theoretical reference for the construction drawing design in the following stage.Furthermore,a series of countermeasures are proposed for the cutting of the foundation pit and the dismantling of the existing structure.%T 型换乘地铁车站续建基坑开挖将对运营结构产生偏压影响，为了保护既有结构的受力、变形满足运营要求，采用 Plaxis 有限元软件对既有 T 型地铁车站续建基坑结构受力、变形影响进行数值分析。结果表明 T 型换乘节点基坑采用明挖方案可行，可为下一步施工图设计提供理论参考。针对续建基坑开挖、既有结构破除等施工风险提出了一系列的保护措施。