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Volume 43, Issue 3 (May 2020)
A New Osmotic Oedometer with Electrical Resistivity Technique for Monitoring Water Exchanges
(Received 4 May 2017; accepted 10 April 2019)
Published Online: 19 June 2019
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This article presents a new osmotic oedometer that is able to measure changes in the degree of saturation (Sr) during suction-controlled drying-wetting and oedometric tests. A circular four-electrode cell made of polyvinyl chloride was developed. The geometric factor of the cell was determined by numerical simulation and validated by calibration tests. A total of 29 samples was statically compacted in the oedometric cell at different moisture contents and dry densities. Based on these measurements, the normalized electrical resistivity was defined and correlated with the Sr. After that, three suction-controlled drying-wetting and oedometric tests were performed on the samples statically compacted at the water content of 21 % and dry density of 1.62 g/cm3, which corresponds to the standard Proctor optimum conditions. The results show (i) the potential of the new oedometer for the study of the hydromechanical behavior of unsaturated soils, (ii) the ability of the electrical resistivity technique to estimate the variation of the Sr in unsaturated oedometric tests, with a relative error smaller than 5 %, and (iii) the coupled effect of vertical stress and suction on the change in void ratio (e) and Sr shown in the (e - suction pressure [s] - vertical total stress [σv]) and (Sr - s - σv) state surfaces.
Derfouf, Feth-Ellah Mounir
Département de Génie Civil et Hydraulique, Université de Saida-Dr Tahar MoulayLaboratoire Eau et Ouvrages dans Leur Environnement, Département de Génie Civil, Université de Tlemcen, Ennasr, B.P 138, Tlemcen
School of Earth Sciences and Engineering, Sun Yat-sen University, Guangzhou,
Laboratoire Eau et Ouvrages dans Leur Environnement, Département de Génie Civil, Université de Tlemcen, Tlemcen
Laboratoire Ondes et Milieux Complexes, Centre National de Recherche Scientifique, Unité Mixte de Recherche 6294, Normandie Université, Le Havre
Laboratoire de Mécanique des Sols, Structures et Matériaux, Centre National de Recherche Scientifique, Unité Mixte de Recherche 8579, CentraleSupélec, Université Paris-Saclay, Gif-sur-Yvette
Stock #: GTJ20170156
Title A New Osmotic Oedometer with Electrical Resistivity Technique for Monitoring Water Exchanges