3D finite element analysis of Dongsen deep excavation in Shenyang

A deep excavation of Dongsen central business district is adjacent to Shenyang government building and major traffic lines.Its planform is complicated and the excavation depth is high.For further study on the influence of deep excavation on soil deformation and stress in Shenyang area and for control of the deformation of foundation pit wall and retaining structure,soil parameters were obtained by in-situ tests,3D analysis model was established using finite element software ADINA,and dynamic simulation and 3D finite element analysis are carried out for the entire process of excavation and supporting with the horizontal displacement of the supporting structure monitored.Numerical simulation results are basically consistent with the monitoring results,which verifies the feasibility of the model and the reliability of the simulation results.The results show that the maximum horizontal displacement of the sidewall occurs at the top;that the foundation heave increases towards the center of the foundation pit but decreases gradually towards the sidewall.Axial stress concentration occurs in the anchorage section of anchor cable,which reflects a better anchoring effect.Stress concentration appears at the bottom of the foundation pit,which indicates a plastic zone of soil,and reinforcement treatment is recommended.