Shaking Table Tests of Embankment Models Reinforced with Geotextiles - Reinforced Soil Engineering: Advances in Research and Practice - page 403

Figure 34 Displacement of earth dam model 1 (C1-2, 300 gal).
In the embankments reinforced with geogrids, settlement could not be reduced
after exceeding 300 gal, but geogrids did play a major role in preventing the
occurrence of cracking.
Although it was impossible to quantitatively evaluate the seismic
strengthening effect, qualitative assessments indicated that it would be possible
to improve farm roads and earth dams of high seismic resistance by improving
their foundations. Furthermore, a reinforcement effect was seen even if only part
of the foundations was improved, indicating that it was possible to undertake
efficient reconstruction to meet the objectives of this study.
In reinforced embankments containing geogrids, it was not possible to
reduce settlement once 300 gal had been exceeded, but geogrids did play a major
role in preventing the occurrence of cracking. A model was constructed of the
previously mentioned earth dam that was destroyed in the Hyogoken-Nambu
earthquake, and the reinforcement effects of geogrids were compared to those of
foundation improvement. Foundation improvements made during the restoration
of an actual earth dam showed a noticeable improvement in the dam's strength,
proving the effectiveness of the proposed method.
Figure 35 Relationship between crest settlement and input maximum acceleration
(earth model 1).