Abstract: With the continuous urbanization, the development of the urban underground space has gradually increased, and the deep excavation projects involved have gradually increased in a deeper and larger direction. This trend requires higher and higher requirements for the excavation supporting system design. This paper presents a deep excavation project in the north of Hangzhou. The paper introduces in detail the characteristics of the foundation excavations and the design of the supporting structures. The PLAXIS finite element numerical software is used to establish a three-dimensional model to simulate the entire process of the excavation construction. The construction monitoring data are compared with the numerical analysis to evaluate the deformation characteristics of the supporting structure. The monitoring data show that the design parameters of this project were reasonably selected and can used for the better control the deformation. By comparing the measured values with the simulated values, the effectiveness of the numerical simulation is therefore verified.

Key words: Deep and Large Foundation Excavations, Deformation Monitoring, Numerical Analysis