Angelo Amorosi

TL;DR: In this paper, a constitutive model for structured soils is proposed, which describes the engineering effects of structure development and degradation, such as: high intact stiffness and strength, appreciable reduction of stiffness due to de-structuring, and evolution of stress-and structure-induced anisotropy.

TL;DR: In this article, the authors derived elasticity models that allow for variation of elastic moduli as power functions of mean stress, while guaranteeing thermodynamic acceptability, and the important issue of the dependence of secant stiffness on strain amplitude (a phenomenon related to dissipation processes in the soil) is acknowledged.

TL;DR: In this paper, different approaches aimed at investigating the dynamic behaviour of circular tunnels in the transverse direction are presented, including 1D numerical analyses performed modeling the soil as a single-phase visco-elastic nonlinear medium, the results of which are then used to evaluate the input data for selected analytical solutions proposed in the literature (uncoupled approach), and 2D fully coupled FE simulations adopting viscoelastic and viscoasto-plastic effective stress models for the soil (coupled-based approach).

TL;DR: In this article, a class of two-invariant stored energy functions describing the hyperelastic characteristics of soils is coupled with a critical-state plasticity model, and the importance of the pressuredependent nature of the elastic shear modulus is assessed within the context of elastic and plastic responses.