Abstract: This paper presents a case history of threedimensional finite element analysis simulation of the entire process of a deep excavation support project by using MIDAS GTS NX. The lateral deflection of the supporting structure and the settlement of the adjacent ground with the excavation depth are numerically monitored. The results The results show that the horizontal displacement of the excavation supporting structure is roughly divided into three stages: stable development, transition and rapid development with the excavation depth. The vertical settlement of the adjacent soil around the excavation increases with the excavation depth. It generally shows an increasing trend, and the surrounding soil from near to far shows the pattern of first heave and then downward settlement; under the same working condition, the vertical displacement of the surrounding soil first changes linearly and then settles with the increase of the distance from the edge of the excavation. The volume gradually stabilized.

Key words: Deep Excavation Support, Numerical Simulation, Deformation