Abstract: This paper presents a three-dimensional numerical modelling of the deep excavation supporting process. The monitored data of the lateral deflections in the soldier pile and ground anchor supporting structure, deep horizontal displacement in the soldier pile, soldier pile and ground anchor axial force changes under different conditions, different waler beam materials and different prestressing force are compared with the numerical analysis results. The results show as follow: the monitored values and numerical calculation data of the foundation excavation support structure are in good agreement, and the monitored values are far less than the warning values specified in the specification; in the process of foundation excavation and support structure construction, the maximum deformation of the pile occurs in the middle of the pile body, compared with the common Isteel waler beam, the concrete waler beam can better control the deformation of the excavated area, and the analysis shows that the design of the support structure selected for the foundation excavation.

Key words: Deep and Large Foundation Excavation, Soldier Pile and Ground Anchor Supporting, Construction Monitoring, Numerical Simulation, Concrete Waler Beams