“L” Shaped Short Bench Excavation Method with Small Step Spacing

This paper takes the Nanjing Hengjiang Avenue construction project as the background and the finite element ABAQUS software as the platform. The 3D digital model of foundation pit excavation is established, and the influence of step construction method and L shape short step construction method on the deformation of foundation pit supporting structure and concrete supporting axial force is calculated and analyzed. After comprehensive analysis of mechanical construction efficiency, operating space and safety, the final selection of “L” shaped short step short distance construction method. The influence of erection time on supporting structure is analyzed, and the final determination is within 10 h. Finally, by comparing the simulation of foundation pit with the measured value, it is concluded that the deformation considering creep is close to the measured value, which is very important for the study of foundation pit deformation.