[en] BACKGROUND AND OBJECTIVES: In landfills, containment is provided by natural or artificial clayey materials known for their low permeability and for their pollutant retention capacity. However, the properties of these media are modified by leachates, whose migration they are supposed to limit. This study aims to reconsider the criteria for choosing suitable materials to make a bottom liner through both their long term hydraulic and mechanical performances. METHODS: Two fine materials sampled in Burkina Faso (West Africa) have been characterized in order to compare their hydro-mechanical behavior in the presence of household waste leachates. The first material is classified as an inorganic clay of low to medium plasticity according to Casagrande plasticity diagram, it is mainly kaolinitic with some traces amounts of smectites. The second one is classified clayey sand of low to medium plasticity, the predominant mineral clay being kaolinite. Hydro-mechanical tests were performed on both sampled materials to judge the sealing properties of these materials, as well as the characteristics of deformation and rupture which have an important effect to ensure the durability of a bottom liner. All these tests were performed first with distilled water then with leachates as interstitial fluids in order to understand the modification of the hydro-mechanical properties of the clayey soils. FINDINGS: Leachate contamination always alters hydraulic properties of the materials. However, between the two soils, the most clayey and the most impervious (soils from Nouna) undergo the deeper weathering. Indeed, hydraulic conductivity of these soils in contact with a synthetic leachate increases from 1.71x10-10 to 1.51x10-9 m/s. In contrast to soils from Boudry, these soils also undergo very significant settlements over the long term with compressibility indexes varying from 0.164 to 0.225. For both soils, the shear strength increases showing that, from this point view, the leachate work in the sense of of the bottom liner stability. For soils from Nouna, the effective cohesion increases from 3 to 21 kPa with a slight decrease of friction angle; for soils from Boudry a slight increase of cohesion is noticed while friction angle increases from 34 to 37°.CONCLUSION: This comparative study is of practical use to environmental geotechnics professionals because it shows that the choice in designing a bottom liner must be a compromise between long term hydraulic and mechanical behaviors of soils. It is also important to know the nature of the flows to contain in order to ensure the durability of the structure.
Disciplines :
Civil engineering
Author, co-author :
Yonli, H.F.; Laboratoire de Physique et de Chimie de l’Environnement, Universite Joseph KI-Zerbo, Burkina Faso ; Ecole Superieure d’Ingenierie, Universite de Fada N’Gourma, Burkina Faso
François, Bertrand ; Université de Liège - ULiège > Urban and Environmental Engineering ; Building Architecture and Town Planning Department, Universite Libre de Bruxelles, Bruxelles, Belgium
Toguyeni, D.Y.K.; Laboratoire de Physique et de Chimie de l’Environnement, Universite Joseph KI-Zerbo, Burkina Faso ; Ecole Polytechnique de Ouagadougou, Burkina Faso
Pantet, A.; UMR 6294 CNRS, Laboratoire Ondes et Milieux Complexes, Normandie Universite, Le Havre, France
Language :
English
Title :
Hydro-mechanical behavior of two clayey soils in presence of household waste leachates
Publication date :
March 2022
Journal title :
Global Journal of Environmental Science and Management
ISSN :
2383-3572
eISSN :
2383-3866
Publisher :
GJESM Publication
Volume :
8
Issue :
2
Pages :
169 - 182
Peer reviewed :
Peer Reviewed verified by ORBi
Funding text :
The authors would like to thank the national laboratory for building and public works in Burkina Faso, where a lot of geotechnical tests were carried out in the framework of this study. Special thanks go to the members of the technical management team on the date on which this work was carried out, in particular the technical director Mr. Kalsibiri Kabor?.
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