Abstract: Based on a complex deep excavation project near the comprehensive subway viaducts, the displacement at the top of excavation support structure, settlement and deep horizontal displacement of the soil, and axial force of the bracing during the process of the deep excavation were monitored. The relationship between the displacement at the top of supporting structure and time, as well as the changes in deep horizontal displacement and the axial force in the bracing were evaluated. The results showed that the horizontal displacement at top of the supporting structure shifted towards the inner side of the excavation as the excavation progressed; The settlement of the supporting structure has a similar trend in different parts, but the numerical values vary, it is mainly affected by the construction load; The deep horizontal displacement of the diaphragm wall shows a trend of “small at both ends and large in the middle” with the excavation depth, and the maximum horizontal displacement of the deep layer increases with the construction progress; The bracing of the deep excavation can effectively share the active soil pressure. 

Key words: Deep Excavation, Construction Monitoring, Deformation, Settlement