Abstract: In the process of construction of a diaphragm wall, the disturbance of soil mass will have an influence on the wall and adjacent buildings. To explore the action mechanism of construction on the wall and adjacent soils, this paper presents the case history of a deep excavation project in Fuyang District of Hangzhou. The design of the deep excavation supporting structure is introduced. Based on the geotechnical investigation report, the horizontal displacements of soils, the lateral displacement of the underground diaphragm wall, the lateral displacement from corner to center, the relationship between the maximum deformation value of the underground diaphragm wall and the excavation depth during the deep excavation construction are systematically analyzed. The results show that the horizontal displacement of the diaphragm wall shows the characteristics of spatial effect. TRD formed cement soil mixed wall has satisfactory groundwater sealing effect and excellent impermeability. The lateral deformation expression of diaphragm wall is derived. The research results can provide a reference and guidance for the design and construction of TRD formed diaphragm wall in the future.

Key words: TRD Cement Soil Mixed Wall, Complex Deep Excavations, Excavation Monitoring, Compatibility of Deformation, Prediction Model