Abstract: The stability of the reinforced retaining wall under earthquake action is one of the main contents of the retaining wall design. A numerical simulation of a 5 m high geogrid-reinforced retaining wall was carried out by using FLAC 3D numerical simulation software, which was based on the Lagrangian finite difference principle and the strength reduction method. The final displacement of the retaining wall, the time history displacement of the key points, the settlement of the soil, the maximum tensile force for each layer of geogrid and the distribution of the tensile force for the single-layer geogrid were analyzed under the dynamic and strength reduction. The results showed that the displacement of the key point has a good correspondence with the reduction factor. The strength reduction coefficient of the reinforced retaining wall under critical stability can be used as the dynamic stability factor of the reinforced retaining wall. After breaking through the stability factor, all parameters changed significantly.

Key words: reinforced soil retaining wall, seismic action, strength-reduction method, dynamic stability factor