2023 Volume 79 Issue 13 Article ID: 22-13029
The behavior of embankment structures during an earthquake can be evaluated with high accuracy by grasping the vibration characteristics and the dynamic deformation characteristics of the constituent materials in detail. However, there are few seismic observation examples of embankment structures. Therefore, we examined the natural period and damping characteristics of the embankment structure during an actual earthquake, and the dynamic deformation characteristics of the constituent materials. In this study, the system identification based on the subspace method was carried out for the river embankment where seismic intensity of about 6 Upper was observed in the 2011 off the Pacific coast of Tohoku Earthquake. The dynamic deformation characteristics of the embankment material were estimated by evaluating the temporal changes in the natural period and damping characteristics of the embankment structure. The estimated results generally agreed with the dynamic deformation characteristics evaluated from the ground investigation.
