Abstract:With the development of high speed railway,more and more attentions have been paid to the effect of vibrating load induced by high speed train on large cross-section tunnel. Based on the numerical simulation of vertical vibrating load induced by high speed train with excitation function,dynamic response of large cross-section tunnel under the vibrating load has been analyzed by elastoplastic finite element method;and the effects of different section forms,train speed and damping ratios on the dynamic response are also studied. Comparisons of dynamic responses between large cross-section tunnel and general one are performed.