Abstract: The unit model is the main analytical model in the design of the subway stations. This paper discusses both the unit model and the global model in the subway design through the appropriate defining the boundary conditions in both model. The analytical results indicate that the differences between two models are within 5% but the global model is closer to the real conditions. It is therefore suggested that the global model be used in the subway station design.

Key words: Underground Station, Unit Model, Global Model, Boundary Conditions