Abstract: Based on the characteristics of Trench Cutting Remixing Deep Wall (TRD) construction method, this paper presents a case history of constructing a deep excavation supporting structure in the cut and cover metro tunnel of Xiong’an New District of Beijing Daxing International Airport Express Line Section 1. The supporting structure using TRD construction method is studied. Both the monitored data of the horizontal and vertical displacement of the TRD constructed cementsoil continuous wall and the performance of the top and horizontal displacement of TRD formed wall are analyzed. The results show that the deformation of the TRD formed cementsoil continuous wall is lower than the allowable value for the supporting structure. The deformation of the wall is related to the depth of foundation excavation. With the increase of the excavation depth, the horizontal displacement of the TRD formed diaphragm wall increases at first and then gradually tends to be stable. Engineering practice proves that the TRD formed cementsoil continuous wall has a good soil retaining performance and water stopping effect.

Key words: TRD Method, Supporting Structure, Site monitoring, Data Analysis