Abstract: Moving element method (MEM) is an efficient approach for dynamic analysis of structure under moving loads. However, a paucity of the research adopting the method for the dynamic analysis of the saturated porous media was found in literature. Based on the coupled dynamic field equation u-p formulation, MEM formulations of the transient-state and steady-state dynamic control equations are obtained. The accuracy and the effectiveness of the technology demonstrated through the results that are in general consistent with each other by the semi-analytical and numerical solution. An example of involving the moving load on the saturated pavement overlying elastic base course is analyzed based on MEM. The transient dynamic response and the steady dynamic response are explored. The results show that obvious transient effect comparing with the steady-state dynamic response is indicated by hydrodynamics. Based on the results of steady-state dynamic response, the influences of load velocity, drainage boundary and permeability coefficient on the dynamic response of saturated asphalt pavement are analyzed. The results of the study can provide a reference for analyzing the damage mechanism of asphalt pavement water stability under hydrodynamic action.

Key words: saturated porous media, moving element method, u-p formulation, transient dynamic response, steady-state dynamic response