Abstract: To investigate the dynamic response of reinforced earth abutment structure under dynamic action of the top strip footing, dynamic load failure test of the indoor reinforced abutment retaining wall was carried out by MTS servo loading system with cyclic dynamic load. Comparative analysis of the reinforced earth retaining wall parameters with three grid lengths and three grid types, such as settlement of reinforced soil retaining wall, horizontal displacement of the panel, earth pressure and strain of the reinforcement, etc. hence revealing the dynamic bearing capacity of reinforced abutment retaining wall. The test results show that there are differences in failure modes of different geogrid lengths and types of reinforced abutment retaining walls under cyclic dynamic loading. When 1.0H, the failure modes of retaining wall of M-A-B-type geogrids are punching shear failure. And when 0.7H and 0.4H, the failure mode of retaining wall of A-type and B-type geogrids are local shear failure. The lateral displacement of the reinforced abutment retaining wall panel decreases with increasing reinforcement length, and the lateral displacement coefficient of the A-type grid reinforced retaining wall is generally smaller than that of the B-type. Due to the length and type of the reinforced geogrid, the abutment retaining wall has significant difference in the attenuation law of the dynamic earth pressure. When 1.0H, the vertical dynamic earth pressure attenuation coefficient of M-type and A-type geogrids are parabolic function along the wall height. When 0.7H, the vertical dynamic earth pressure attenuation coefficient of A-type and B-type geogrids are exponential function along the wall height.

Key words: abutment soil retaining wall, geogrid, bearing behavior, dynamic characteristics