Abstract: This paper presents experimental studies on the dynamic stress-strain relationship and the dynamic shear modulus properties of a tailing silt through a series triaxial tests under various consolidation stress conditions. The results indicate that dynamic stress-strain behavior can be effectively described by a hyperbolic model that demonstrates significant nonlinear characteristics. The initial dynamic shear modulus is influenced by multiple factors, including confining pressure, consolidation stress ratio, and void ratio. Specifically, it increases with higher confining pressure and consolidation stress ratio but decreases as the void ratio increases. Further analysis reveals a power-function relationship between the initial dynamic shear modulus G₀ and the parameter σ_3cK_c This relationship allows for the normalization of G₀ under different consolidation stress states, with minimal influence from the void ratio. The findings offer valuable insights for assessing the dynamic stability of similar tailings dams under seismic and other dynamic loading conditions.

Key words: Tailings Silt, Dynamic Triaxial Test, Dynamic Shear Modulus