In this paper FLAC3 Dsoftware was used to take the soil-underground structure interaction as a plane strain problem

the Mohr-Coulomb soil constitutive model was used to simulate the nonlinear dynamic behavior of soils above the groundwater level

and the Finn constitutive model was used to simulate the nonlinear dynamic behavior and development of pore water pressure of soil below the groundwater level.Several different scenarios under earthquake action were analyzed.The results of analysis show that with rise of water level

the pore water pressure and pore pressure ratio increase

and the soil around the structure is easy to be liquefied.Peak accelerations at top and bottom slabs and center pillar occur at the same time with seismic wave crest

and the change of the groundwater level has insignificant effect on accelerations at top and bottom slabs and center pillar.The stresses at bottom slab′s corners are greater than that at the center pillar

and the pricipal stresses at bottom slab increase with the increase of groundwater level.