Abstract:Employing Byrne model to simulate cyclic liquefaction of soils,a three-dimension model that consists of main tunnels,transverse evacuating passage and strata of Nanjing Yangtze River tunnel is established to study structure dynamic mechanical(stress and displacement) responses by inputting transverse and longitudinal seismic waves;and the different influences of transverse and longitudinal seismic waves on pore water pressure,effective stress are studied. The conclusion shows that the damage of transverse earthquake excitation to structure is much more serious than that of longitudinal earthquake excitation,and that the peak value of maximum tension stress of intersecting section of main tunnel-evacuating passage is about 3 MPa under transverse earthquake excitation,which is over the ultimate tensile strength of structure and will lead to a failure tendency of tension fracture. An aseismic mitigation method was proposed,and the achieved conclusion is helpful for the aseismic design of similar projects.