Abstract: With the development of high-rise buildings and the underground space domestically and abroad, the deep excavation engineering is developing towards the larger and deeper direction. At present, one of the many supporting (or retaining) structures of deep excavations is the underground diaphragm wall as the supporting structure, which has been widely used in engineering projects. The application of diaphragm wall solves the problems of “retaining soil” and “stopping water” in the deep excavation projects and plays an important role in ensuring the safety of the deep excavation engineering. Based on a project case history, this paper uses FLAC3D numerical analysis software to simulate and analyze the displacement and deformation of soil in the process of excavation and support of the underground diaphragm wall. The research has practical value and theoretical significance. Secondly, the ratio between the design value and the actual project monitoring value is evaluated by the same software, and then analyzed. The correctness of the model is established and verified, which has a special reference role and obvious significance for a better understanding of the interaction mechanism of the diaphragm wall.

Key words: Deep Excavation Support, Diaphragm Wall, Deformation