A hypoplastic constitutive model and hypoplasticity are described briefly. A procedure for the determination of its parameters is described in detail. This model is based on nonlinear tensorial functions and is developed without recourse to concepts of elastoplasticity theory such as yield surface

plastic potential

flow and hardening rules and decomposition of deformation into elastic and plastic parts. The paper also presents the hypoplastic model that is capable of capturing the salient features of granular materials，in particular

for problems involving extremely low stress levels or extremely high stress.