Abstract: In this paper, for developing two-layer prestressed longspan subway station, the nonlinear seismic numerical simulation of soil-subway station interaction system is conducted, using the plastic-damage constitutive model to describe nonlinear characteristics of concrete under cyclic loading, considering the structural damping and the initial stress of soil-structure interaction system due to the gravity and prestress of reinforced concrete. Destruction process, destruction forms and destruction location were analyzed after the simulation. The results indicate that: Dynamic shear stress concentrates in side wall near to baseboard, the midspan and the root of top board and level board, even lost tensile strength. Dynamic tensile and compression damage would emerge easily in vertical direction of side wall near to baseboard, and it also emerge easily in horizontal direction of top board and level board . Dynamic shear stress concentrates in turn in the junction of side wall and top board, baseboard. Side wall near to baseboard and the root of top board are key parts of a frame for safety because failure occurs earlier there.

Key words: prestress, longspan subway station structure, seismic damage, numerical simulation, plastic-damage