Abstract: The control deformation in the supporting structures in the deep excavation is mainly determined through empirical methods and these experiencebased criteria could not meet the state f the practice requirements of the increasingly larger depth, span length and quantity of excavations. This paper presents a case history of the deep excavation support for the metro station of Fifth Route of Guanggu in Metro Line N. 11. Factors, such as, ambient temperature, construction activities as well as space effect, which might potentially affect the magnitude of the horizontal deflection in the deep excavation supporting structure, are evaluated. The results indicate that the lateral deflections are strongly affected by the ambient temperature and the adjacent construction activities. The space effect is a function of supporting structure type and excavation sequence. It has less effect on the lateral deformation control criteria.

Key words: Deep Excavation, Horizontal Deflection, Temperature Effect, Space Effect