摘要
根据天津文化中心地下交通枢纽工程中地下空间与轨道交通同步实施的情况,介绍了该项目的基坑特点和施工特点。按实际围护结构的方案建立三维有限元模型,采用修正剑桥模型的塑性势函数进行计算,提出了以地下连续墙作为围护结构的明挖法和盖挖法相结合的设计方案。交代了围护结构选型、结构梁板替代水平支撑与反压土、竖向支承系统和下沉式广场区域水平支撑设计等关键设计节点。
According to the simultaneous construction of underground space and metro traffic in the subway traffic hub project of Tianjin Culture Centre,the characteristics of foundation pit and construction are introduced in the paper.A 3D finite element model is built on the basis of the practical closure structure,which is calculated by plastic power function of modified Cambridge model.The design plan of combination of open and covered excavation is proposed,which using the diaphragm wall as the closure structure.Then,several design key points are discussed including closure structure collection,structure beam plane replacing horizontal support and earth berm,vertical support system and sink-style square area horizontal support,etc.
出处
《中国市政工程》
2010年第3期78-80,共3页
China Municipal Engineering
关键词
超大基坑
盖挖法
围护
明盖结合
super-large foundation pit
cover excavation method
closure
combination of open and covered excavation
