Model Tests of Seismic Stability of Several Types of Soil Retaining Walls - Reinforced Soil Engineering: Advances in Research and Practice - page 338

In summary, the experimental data support the overall trend of the
Mononobe-Okabe method. However, the detailed quantitative evaluation of the
Mononobe-Okabe method was not possible, because of the delicate nature of
dynamic earth pressures. It is readily seen that the reinforced soil RWs could
stand without exhibiting ultimate failure against earth pressures that were much
higher than those acting on the conventional-type RWs.
Figure 22 Effects of correction for response of soil wedge on relationships between
resultant normal force acting on facing from backfill and seismic coefficient.