Study of Dynamic Characteristics of Subgrade Soil under High Frequency Dynamic Load

Abstract

By Exerting high frequency dynamic load on the subgrade soil, the dynamic elastic damping ratio was tested under different dry density, with comparing and analyzing the results of dynamic triaxial tests, it presented the influence of dynamic elastic modulus and damping ratio on the development of subgrade soil. The results showed that the dynamic elastic modulus of the different dry density subgrade soil under high frequency dynamic load, which decreases with the increase of dynamic strain, the smaller the dry density is, the faster the dynamic elastic modulus decays; the dynamic shear modulus law is consistent with the development trend of elastic modulus, it decreases with the increase of dynamic shear deformation, the larger the elastic modulus of soil is, the larger the dynamic shear modulus is; although the damping ratio is discrete, with the increase of the dynamic shear stress, the damping ratio as a whole tends to increase, the higher the dry density is, the slower the damping ratio increases.