I believe that the Mononabe-Okabe pseudo-static analysis is generally believed to be recommended and fairly conservative for geosynthetic reinforced walls. This can be found in Mitchell and Villet, 1987 and Christopher et al. 1990. For metallic reinforcement Vrymoed 1990 is a source.
I have a manual titled "Segmental Retaining Walls-Seismic Design Manual" by the National Concrete Masonry Association dated 1998- phone #(703)713-1900