Numerical Simulation Analysis of Subway Station Deep Excavation Pit

Abstract

Excavation and shoring of deep foundation pit for subway station is a kind of very complex engineering. Existing shoring calculation theory is limit equilibrium method based on the rigid plastic theory, the shoring’s structural force is the limiting force when the failure happens, so the actual stress on the shoring structure in use can’t be calculated, the foundation pit deformation is just a estimate based on experience, shoring design mostly relies on the practical experience, and as a result it is very difficult to design a safe, reasonable and economic shoring structure. In comparison with the theory method, the numerical simulation is advantageous in terms of calculation of actual stress and displacement. Before excavation of deep foundation pit, numerical simulation can be used to analyze the mechanism and cause of foundation pit deformation and failure, therefore reasonable effect can be achieved by adjusting the shoring. Taking Antuoshan Station of Shenzhen Subway Line 7 as an example, this thesis uses FLAC numerical simulation analysis and proves that this software’s application in foundation pit engineering can sufficiently supplement the calculation theory.