Abstract: The traditional analysis theory of the deep excavation and the conventional excavation engineering design software cannot fully consider the spatial effect in the deep excavation construction process. This paper presents an excavation engineering in Wuhan. The finite difference numerical software was used to establish the three-dimensional numerical model of the area to be excavated. Through the estimation of the displacement field and the stress field of the supporting system and the surrounding environment, analysis of variation of the uneven terrains, the construction deformation induced by the unbalanced earth pressures in the process of deep foundation are investigated. The results show that the unbalanced earth pressure has obvious influence on the bearing deformation characteristics of the excavated area. The supporting structure may be globally tilted due to the unbalanced earth pressures. There are significant spatial effects in the process of the deep excavation construction. The long side and the short side of the excavated area are mutual supports, but the supporting effect of the long side to the short side is more significant than that of the short side to the long side.

Key words: Unbalanced Earth Pressures, Deep Excavation, Spatial Effect, Numerical Analysis