This note evaluates the implications of adopting different types of models to reproduce the chemo-hydro-mechanical behavior of compacted active clays exposed to processes of salinization and desalinization. First, experimental observations and theoretical considerations pertinent to a double porosity formulation of the problem are introduced. Fundamental equations are then re-formulated according to a simpler single porosity frame. Finally results of diffusion tests performed to highlight the coupled chemo-hydro-mechanical behavior of the soil are reproduced by means of the two different models. In order to reproduce the experimental results is not sufficient to invoke mechanical non-linearities; it is also necessary to introduce non-linear hysteretic adsorption isotherms. However, the physical meaning of the required adsorption parameters is doubtful, which demonstrates the limitations of the single porosity model in tackling these types of phenomena. © 2015 Taylor & Francis Group.

Comparing double porosity and single porosity models for the simulation of coupled chemo-hydro-mechanical behavior of compacted active clays / Musso, G.; Della Vecchia, G.. - 2:(2015), pp. 851-856. ((Intervento presentato al convegno International Symposium on Geomechanics from Micro to Macro, IS-Cambridge 2014 tenutosi a Cambridge, gbr nel 2014 [10.1201/b17395-152].

Comparing double porosity and single porosity models for the simulation of coupled chemo-hydro-mechanical behavior of compacted active clays

Musso G.;Della Vecchia G.
2015

Abstract

This note evaluates the implications of adopting different types of models to reproduce the chemo-hydro-mechanical behavior of compacted active clays exposed to processes of salinization and desalinization. First, experimental observations and theoretical considerations pertinent to a double porosity formulation of the problem are introduced. Fundamental equations are then re-formulated according to a simpler single porosity frame. Finally results of diffusion tests performed to highlight the coupled chemo-hydro-mechanical behavior of the soil are reproduced by means of the two different models. In order to reproduce the experimental results is not sufficient to invoke mechanical non-linearities; it is also necessary to introduce non-linear hysteretic adsorption isotherms. However, the physical meaning of the required adsorption parameters is doubtful, which demonstrates the limitations of the single porosity model in tackling these types of phenomena. © 2015 Taylor & Francis Group.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11583/2858732