Modelling the behaviour of unsaturated non-active clays in saline environment

Scelsi, Giulia, Abed, Ayman A.,; Gabriele, Della Vecchia,,; Musso, Guido; W. T. , Solowski,,

doi:10.1016/j.enggeo.2021.106441

The chemical composition of pore fluid and matric suction rule the mechanical behaviour of soils. In case of clays, their fabric changes in line with those variables. Since both the increase in matric suction and salinity cause a transition from an open to a close microstructure of low and medium activity clayey materials, a unique framework could tackle problems where salinity and saturation changes are expected. This paper presents a simple elasto-plastic model capable of reproducing the behaviour of unsaturated clayey soils in saline environments. Changes in the pore fluid composition are addressed through the use of osmotic suction as a variable. The proposed model extends the Barcelona Basic Model for partially saturated soils to consider the effect of osmotic suction. The model, implemented in the Thebes code, is calibrated for Boom Clay. The reproduced tests include mechanical loading at different matric and osmotic suctions in oedometric conditions, as well as more complex chemo-mechanical stress paths. Despite the simplicity of the formulation, the agreement between the experimental results and the simulations is encouraging. It seems that the modelling approach addresses the most important features of partially saturated soils with saline pore fluid which are slightly or moderately expansive.

Modelling the behaviour of unsaturated non-active clays in saline environment / Scelsi, Giulia, Abed, Ayman A., ; Gabriele, Della Vecchia,, ; Musso, Guido; W. T. , Solowski,,. - In: ENGINEERING GEOLOGY. - ISSN 1872-6917. - STAMPA. - 295(2021). [10.1016/j.enggeo.2021.106441]

Titolo:	Modelling the behaviour of unsaturated non-active clays in saline environment
Autori:	Scelsi, Giulia, Abed, Ayman A. Gabriele, Della Vecchia, MUSSO, GUIDO W.T., Solowski, mostra contributor esterni nascondi contributor esterni
Data di pubblicazione:	2021
Rivista:	ENGINEERING GEOLOGY
Digital Object Identifier (DOI):	http://dx.doi.org/10.1016/j.enggeo.2021.106441
Appare nelle tipologie:	1.1 Articolo in rivista

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