分仓墙兼作抗拔墙在地铁明挖车站基坑中的应用

Application of partition wall as anti-pulling wall in foundation pit in cut and cover subway station

以北京地铁8号线永定门外站在全国首次采用地铁车站水下开挖封底混凝土浇筑工程为背景,介绍采用分仓墙结构解决封底混凝土一次浇筑的技术问题,同时分仓墙兼作抗拔墙,以满足基坑抗浮要求。通过有限元分析分仓墙布置形式对地连墙支护结构变形的影响,对基坑分仓墙平面布置结构进行了优化设计,并系统阐述了分仓墙的关键施工技术。

Taking Yongdingmenwai Station of Beijing Metro Line 8 as the background for the first time in China to adopt the under water level excavation concrete casting project of the Metro station,this paper introduces the technical problems of one-time casting of the foundation pit bottom concrete with the partition wall structure,and the partition wall is also used as the anti-pullout force wall to meet the anti-floating force requirements of the foundation pit.Based on the finite element analysis of the infl uence of the layout of the partition wall on the deformation of the diaphragm wall supporting structure,the optimal design of the plane layout structure of the partition wall of the foundation pit is carried out,and the key construction technology of the partition wall is systematically expounded.