Abstract:Based on dynamic triaxial tests, in this paper, we present the results of research on the dynamic modulus, damping ratio, and shear strength of undisturbed and remolded earthen-site soils in the Hexi area, Gansu Province. We then use numerical simulation to analyze the dynamic responses of earthen-site soil under the action of destructive earthquakes. The results indicate that the dynamic stress and dynamic strain of both undisturbed and remolded earthen-site soils show a nonlinear relation in the elastic range, fitting the hyperbolic model. With increases in the dynamic strain, the dynamic elastic modulus is decreased. In the same strain range, the increasing trend of the damping ratio of the remolded soil is obviously higher than that of the undisturbed soil. Under the same conditions, the cohesive force of the undisturbed soil is slightly higher than that of the remolded soil. To a certain extent, the strength of an earthen-site is restored by consolidation, but the seismic performance of the soil should be strengthened when earthquake strikes.
