English：

In order to solve the problems of small working surface and difficult construction in deepfoundation excavation and support engineering of subway station, hollow concrete-filled steel tube supportis proposed. In this paper, the calculation formula of composite strength of hollow concrete-filled steeltube 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 ofcomponents is analyzed. The finite element software MIDAS GTS is used to simulate and check thesurface subsidence and pile deformation of a subway station foundation excavation in Xi’an. The resultsshow that the bearing capacity of hollow concrete-filled steel tube brace is significantly higher than that ofhollow steel tube brace. The bearing capacity of hollow concrete-filled steel tube support increases withthe decrease of hollow ratio and decreases with the increase of slenderness ratio. Compared with thehollow steel tube support, the surface subsidence and pile deformation are reduced after the hollow steeltube concrete support, which is beneficial to control the surface subsidence and the deformation of theretaining pile.