Influence of electroosmotic treatment on the hydro-mechanical behaviour of clayey silts: preliminary experimental results |
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Authors: | Laura Gabrieli Cristina Jommi Guido Musso Enrique Romero |
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Affiliation: | (1) Department of Structural and Geotechnical Engineering, Politecnico di Torino, Corso Duca degli Abruzzi, 24, 10129 Torino, Italy;(2) Department of Structural Engineering, Politecnico di Milano, piazza Leonardo da Vinci, 32, 20133 Milano, Italy;(3) Department of Geotechnical Engineering and Geosciences, Universitat Politècnica de Catalunya, c./Jordi Girona 1–3, Campus Nord, Edificio D-2, 08034 Barcelona, Spain |
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Abstract: | Preliminary results of an investigation focused on the influence of electrokinetic treatment on the mechanical and hydraulic
behaviour of clayey soils are presented. The experimental programme aims at providing a contribution to the sustainability
of contaminant extraction or containment via electroosmosis. Changes in the hydraulic and mechanical properties of two illitic
clayey soils, subjected to a DC electric field, were investigated. Samples of the two soils were subjected to electrokinetic
filtration, for different periods of time, and under different constant loads. Afterwards, they were tested under one-dimensional
compression to detect changes in stiffness and hydraulic conductivity due to the electrical treatment. After the application
of a DC field for a few hours, a small reversible increment in the average soil stiffness was observed, with respect to the
untreated soil, while the hydraulic conductivity was not affected substantially. Dramatic changes of the mechanical and hydraulic
soil properties, correlated to changes of the soil pH, were observed following non-conditioned electrokinetic treatment with
duration of the order of days. |
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Keywords: | Clayey soils Electrokinetic treatment Electro-hydro-mechanical coupling Experimental investigation |
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