Abstract: A comprehensive underground engineering projects normally have concerns of mutual deep excavation groups affecting each other. Due to the close distance between deep excavations and staggered construction periods, the deformations and the stresses in deep excavation groups are usually more complex than a single excavation project. Based on an actual engineering project, this paper conducts two-dimensional numerical analysis of the interaction between the construction of the ultra-deep underground diaphragm wall deep excavation groups, considering the different earthwork excavation sequences of the adjacent ground walls. The results show that: 1) The main impact area for the physical deformation and the different earthwork excavation sequences of the underground diaphragm wall is the adjacent range of the underground diaphragm wall, with no effect on the external underground diaphragm wall; 2) The earth excavation sequence will affect the surface settlement among underground diaphragm walls, and the maximum settlement point will deviate from the area of ground walls excavated earlier; 3) The earthwork excavation sequence has limited settlement effects on the outside the ground wall; 4) The deformation of the pipeline is mainly affected by the excavation of the adjacent underground diaphragm wall, while the pipeline far from the underground diaphragm wall construction has had little impact.

Key words: Diaphragm Wall, Deep Excavation Groups, Numerical Analysis, Interaction Analysis