Abstract: The need of high raised buildings and underground spaces increases with the urban development. As a result, the applications of deep excavation supporting systems are more and more popular. The cost effective and construction safety still required further research into the supporting system. The paper presents a case history of deep excavation of Beijing Sijiqing Drinking Water Emergency Center. The deformation of the excavation supporting system is evaluated throughout the theoretical analysis, laboratory testing and numerical simulations. The three dimensional FLAC3D analysis results indicate that, with the increasing of the excavation depth, the deformations in soil mass and the supporting system are also increasing. The ground anchors can effectively control the deformation in the supporting system. The excavation depth reaches the maximum depth and the deformations in the supporting system also become the maximum.

Key words: Deep Excavation Projects, Numerical Simulation, FLAC3D； Deformation in Deep Excavation Supporting System