Ricerc@Sapienza

In this work the anisotropic model for clays SANICLAY proposed by Dafalias and Taiebat (2013) is reformulated within the framework of hyper-elastoplasticity. The model, called SANICLAY-T, is fully defined by two scalar potential functions, the free energy and the rate of dissipation. It is first presented in the triaxial space and then generalised in the multiaxial one. The model reproduces exactly the original one for the case of associate flow rule, while leads to a different outcome for non-associated flow.

This note presents the preliminary outcomes of a numerical investigation on the influence of soil partial saturation on the behaviour of laterally loaded piles. The modified Cam clay model extended to unsaturated conditions and formulated in terms of Bishop’s effective stress has been used to analyse the results of centrifuge tests designed to address this topic. The model, calibrated on laboratory tests, well reproduces the main aspects of the soil-pile interaction.

This paper discusses the role of constitutive modelling in the context of modern sustainability-driven geotechnical engineering. The necessary definitions and fundamental relations among the elements characterising sustainability in civil and geotechnical engineering are first provided, based on the available scientific literature, to then introduce the key topic here discussed by some examples, characterised by increasing level of complexity in terms of constitutive modelling assumptions.

This paper describes a numerical approach for the analysis of the seismic ground response and the dynamic soil-structure interaction accounting for the three components of an earthquake motion. The investigation was performed with reference to the case-history of Lotung (Tai-wan), where the seismic response of a nuclear power plant model as well as that of its founda-tion soil were measured during several earthquakes occurred at the site.

This paper deals with a new critical state–based constitutive model for soft rocks and fine‐grained soils.