局部逆作法在紧邻地铁超深基坑中的应用

Application of partial top-down method in ultra-deep excavations adjacent to subway

昆明某紧邻地铁车站的超深基坑设计实践中,为控制支护结构位移,采用分区施工和周边逆作的方法。设计过程中应用有限元分析的方法,验证了分区施工和逆作法对基坑位移变形的控制效果,优化了与建筑结构设计的衔接,于工期与造价有利,经验可供类似项目借鉴。

In the practice of designing an ultra-deep excavations next to a subway station in Kunming,in order to control the displacement of the retaining structure,the methods of zoning construction and surrounding top-down method are considered. At the same time,the application of finite element analysis in design practice has verified the control effect of zoning construction and topdown method on the displacement and deformation of the excavations,optimized the connection with the structural design of the building,and has a favorable construction period and cost. The experience can be used for similar projects.