Modelling anisotropic deformation characteristics of gravelly layer in Hualien, Taiwan

The Hualien Large-Scale Seismic Test program was conducted to investigate Soil-Structure interaction during large earthquakes in the field of Hualien, a high,seismic region in Taiwan. In this paper, the ground of the test site, which consists of a sand layer and a hard gravelly layer, is characterized and modelled for accurate dynamic simulation analysis. Especially, the anisotropic behavior of the gravelly layer is modelled and simulation analysis of the forced vibration test is conducted. Consequently, it was revealed that anisotropic behavior of the gravelly layer observed in earthquake observation and forced vibration tests could be expressed by the orthotropic elastic body model.