This article introduces a study on evaluation of dynamic properties of large coarse gravel
materials used for large geotechnical structures. This topic was approached by various methodologies; lab test, in-situ seismic test, monitoring and numerical analysis. The dynamic characteristics of gravelly materials were evaluated in the lab by both newly developed large scale resonant column testing and large cyclic triaxial testing, and the parameters affecting the dynamic properties were investigated. To evaluate in-situ characteristics, new surface wave method and seismic reflection method were involved. The dynamic properties of gravels in large dam could be estimated by system identification method using micro earthquake monitoring signals, and back analysis using 2D and/or 3D numerical modeling. From this study, general method to evaluate gravelly construction materials and the range of modulus and damping characteristics will be provided.
