Abstract: The dynamic properties of a typical compacted Guilin Red Clay were tested in GDS strained controlled cyclic triaxial apparatus under the consolidated undrained conditions. The factors that might potentially affect the dynamic shear modulus and damping ratio are consolidation pressure, consolidation stress ratio, degree of compaction and the initial strain. The influence of these factors are summarized. The results indicate that, the dynamic shear modulus reduces with the increase of cyclic strain and increases with the confining pressure, consolidation ratio and degree of compaction. The cyclic shear modulus ratio decreases with the increase of cyclic strain, confining pressure and consolidation stress ratio and increases with the degree of compaction of the sample. The damping ratio increases with the cyclic strain, confining pressure and consolidation stress ratio. The magnitude of the damping ratio is proportional to the cyclic strain magnitude. The cyclic shear stress and cyclic shear modulus ratio can be well fitted by the HardinDrinevich Hyperbolic Model.

Key words: Cyclic Triaxial Testing, Dynamic Shear Modulus, Dynamic Shear Modulus Ratio, Damping Ratio, Dynamic Shear Strain