Slaking tests of soil-rock mixture and the simulation of state-dependent elastoplastic model

A series of large-scale triaxial tests employing the 'dual-line' methodology were performed to examine the slaking mechanical behavior of soil-rock mixture materials characterized by both dense and loose compactness. The study analyzed the impact of slaking on several parameters, including the secant modulus (E50), the critical state friction angle, the peak state friction angle, and the positioning of the critical state line. The findings reveal that the slaking process leads to a reduction in the secant modulus E50, as well as in both the critical state and peak state friction angles. Notable alterations in the isotropic compression line and the critical state line were observed in the soil prior to and following wetting. Subsequently, utilizing a state-dependent constitutive model for cohesionless soils, the stress-strain relationship of the deposit was simulated both before and after wetting. The results of the model simulation were found to effectively capture the changes in shear dilatancy characteristics of the deposit in relation to the wetting process, in comparison to the experimental data.