邻近新建地铁车站的深基坑工程的变形分析

Deformation Analysis of Deep Excavation Adjacent to the New Subway Station

随着城市建设的发展,在地铁附近不可避免的进行深基坑的开挖,为确保基坑自身以及既有结构的安全,有必要对基坑的开挖变形进行研究。结合天津实际深基坑工程,研究基坑开挖对基坑围护结构和邻近结构的影响。采用有限元软件建立深基坑开挖的三维数值模型,模拟基坑施工全过程,并结合实际监测数据,分析基坑开挖时地下连续墙及既有站体的变形规律,结果表明,在基坑支护设计中应有针对性的增强支护体系刚度,才能有效降低基坑施工对邻近既有结构的扰动,并总结了在基坑支护设计中的其它若干需要注意的问题,为今后同类工程设计与施工提供参考。

With the development of urban construction,deep excavation adjacent to the subway is inevitable. It is necessary to study excavation deformation to ensure the safety of the excavation and existing structures. Combined with one deep excavation,the effects of deep excavation on the retaining structures and the adjacent structures were studied. A three-dimensional finite element model was established in order to simulate the whole process of excavation construction. The deformations of the diaphragm walls and the adjacent subway station were analyzed by the monitoring results and the computed results. The results show that it is necessary to strengthen the stiffness of the supporting system in the design of excavation,so as to effectively reduce adverse effect of the adjacent existing structure due to excavation construction. In addition,some other conclusions of the retaining structure in the design of excavations were summarized,which can provide references for the other similar engineering design and construction.