Abstract: Compared with other areas in Wuhan, the Yangtze River I terrace has a structure with the upper soft clay layer and the lower sandy dual layer. Many geohazards of the super-large deep excavation projects indicate that the potential safety of such projects will result in a huge loss to the projects if they are not paid enough attention to. This paper focuses on the design and the estimation of deep excavation and use a project case history to perform the analysis. Two methods are used to analyze the stress and the deformation principles of the supporting structure: (1) using the elastic resistance method for the estimation; and (2) using the three-dimensional finite element software Geotechnical & Tunnel Analysis System to simulate and analyze the excavation process of the deep excavation. Based on the analysis of the deformation of the supporting structure, several models are used to estimate the deformation, and the results are compared with the actual construction monitoring data. The feasibility of the supporting structure is verified by the analytical results and the monitoring data, which provides guidance for similar projects.

Key words: Yangtze River I Terrace, Very Large Deep Excavation Project, Diaphragm Wall, Three-Dimensional Finite Element, Numerical Analysis, Actual Measurement Comparison