The constitutive model for unsaturated sands based on thermodynamics

The mechanical behavior of unsaturated sands inevitably observe the thermomechanics principle, for it is a universal theory. By this method, we can study the hydraulic-mechanical behavior of soils with a general insight under a more universal law. Based on thermomechanics theory, considering the back stress ratio tensor alpha reflecting the anisotropic fabric and the special relations between anisotropy and plastic dissipation of sands, a solid-liquid coupled constitutive modeling framework is established which can deeply indicate many complex behavior and properties for unsaturated sands.