EXPERIMENTAL STUDY ON DYNAMIC CHARACTERISTICS OF SANDY LOESS OF AEOLIAN SAND TO LOESS TRANSITIONAL ORIGIN

With the exploration and development of various kinds of resources in area of desert-loess plateau, poor understanding about the dynamic characteristics of sandy loess of aeolian sand to loess transifional origin has become the constraint more than ever in this region. This issue is particular for development of earthquakes and artificial power engineering construction. In this paper, under isotropic consolidation condition, consolidated undrained dynamic triaxial tests under different confining pressures are tested for the aeolian sand-loess transitional sandy loess. Kinetic parameters are obtained. Based on them, the dynamic stress-strain relationship of aeolian sand-loess transitional sandy loess was drawn. The change characteristic of dynamic shear modulus and damping ratio with dynamic strain of their relation curve and fitting model is explored. Equivalent dynamic visco-elastic constitutive model is further established for applicable to aeolian sand-loess transitional sandy loess. Results show that the relation curve between dynamic shear modulus and dynamic strain fits well for aeolian sand-loess transitional type of sandy loess, according to the Harding hyperbolic model. Besides, the power function model is good for fitting the relationship between damping ratio and dynamic strain. The results achieved in this paper provide basic data for the future research of dynamic characteristics of aeolian sand-loess transitional sandy loess.