Abstract: Martin-Finn dynamic pore water pressure incremental model simplified by Byrne is used to describe the liquefaction characteristics of the soil. Davidenkov viscoelastic constitutive model is used to describe the nonlinear characteristics of the soil. Then a two-dimensional analysis model about the nonlinear static-dynamic coupling interaction between liquefiable foundation and metro station structure is established. The dynamic effective stress analysis method is used to analyze the dynamic response of two-layer three-stride island-type metro station structure in liquefiable foundation; and then the results are compared to the case of dynamic total stress numerical analysis. The results show that, the soil which is adjacent to the both sides and bottom of metro station are easier to be liquefied; the liquefaction of foundation has a significant influence on the ground acceleration response; the metro station is obviously floated under the influence of liquefaction and has a convex deformation in the middle of the station. The failure modes of the station are as follows: the tensile failure in upper roof and both ends of bottom plane, the arch bending failure in the middle of lower base plate side span , the compressive failure in interior column, the bending failure in bottom of side wall.

Key words: metro station structure, seismic failure mechanism, liquefiable foundation, dynamic effective stress analysis