Research on Hollow Concrete-filled Steel Tube Support Test and Its Application in Deep Foundation Excavation
In order to solve the problems of small working surface and difficult construction in deep foundation excavation and support engineering of subway station,hollow concrete-filled steel tube support is proposed.In this paper,the calculation formula of composite strength of hollow concrete-filled steel tube is deduced and simplified.The transverse loading test of components is carried out by electro-hydraulic servo press,and the influence of hollow ratio and slenderness ratio on the bearing capacity of components is analyzed.The finite element software MIDAS GTS is used to simulate and check the surface subsidence and pile deformation of a subway station foundation excavation in Xi'an.The results show that the bearing capacity of hollow concrete-filled steel tube brace is significantly higher than that of hollow steel tube brace.The bearing capacity of hollow concrete-filled steel tube support increases with the decrease of hollow ratio and decreases with the increase of slenderness ratio.Compared with the hollow steel tube support,the surface subsidence and pile deformation are reduced after the hollow steel tube concrete support,which is beneficial to control the surface subsidence and the deformation of the retaining pile.
foundation excavationsupportssteel tubeconcretetestsfinite element analysis
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