Global J. Environ. Sci. Manage. 8(2): 169-182, Spring 2022, Serial #30 *Corresponding Author: Email: [email protected] Phone: +226 7140 9576 ORCID: 0000-0002-4981-4705 Global Journal of Environmental Science and Management (GJESM) Homepage: hps://www.gjesm.net/ ORIGINAL RESEARCH PAPER Hydro-mechanical behavior of two clayey soils in presence of household waste leachates H.F. Yonli 1,2,* , B. François 3 , D.Y.K. Toguyeni 1,4 , A. Pantet 5 1 Laboratoire de Physique et de Chimie de l’Environnement, Université Joseph KI-Zerbo, BP 7021 Ouagadougou 03, Burkina Faso 2 Ecole Supérieure d’Ingénierie, Université de Fada N’Gourma, BP 46 Fada N’Gourma, Burkina Faso 3 Building Architecture and Town Planning Department, Université Libre de Bruxelles, Avenue F.D. Roosevelt 50, CP 194/2, 1050 Bruxelles, Belgique 4 Ecole Polytechnique de Ouagadougou, 08 BP 143 Ouagadougou 08, Burkina Faso 5 UMR 6294 CNRS, Laboratoire Ondes et Milieux Complexes, Normandie Université, Unihavre, 53 rue Prony, 76600 Le Havre, France BACKGROUND AND OBJECTIVES: In landfills, containment is provided by natural or arficial clayey materials known for their low permeability and for their pollutant retenon capacity. However, the properes of these media are modified by leachates, whose migraon they are supposed to limit. This study aims to reconsider the criteria for choosing suitable materials to make a boom 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 plascity according to Casagrande plascity diagram, it is mainly kaolinic with some traces amounts of smectes. The second one is classified clayey sand of low to medium plascity, the predominant mineral clay being kaolinite. Hydro-mechanical tests were performed on both sampled materials to judge the sealing properes of these materials, as well as the characteriscs of deformaon and rupture which have an important effect to ensure the durability of a boom liner. All these tests were performed first with dislled water then with leachates as intersal fluids in order to understand the modificaon of the hydro-mechanical properes of the clayey soils. FINDINGS: Leachate contaminaon always alters hydraulic properes of the materials. However, between the two soils, the most clayey and the most impervious (soils from Nouna) undergo the deeper weathering. Indeed, hydraulic conducvity of these soils in contact with a synthec leachate increases from 1.71x10 -10 to 1.51x10 -9 m/s. In contrast to soils from Boudry, these soils also undergo very significant selements 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 boom liner stability. For soils from Nouna, the effecve cohesion increases from 3 to 21 kPa with a slight decrease of fricon angle; for soils from Boudry a slight increase of cohesion is noced while fricon angle increases from 34 to 37°. CONCLUSION: This comparave study is of praccal use to environmental geotechnics professionals because it shows that the choice in designing a boom 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. ARTICLE INFO Arcle History: Received 08 June 2021 Revised 29 July 2021 Accepted 06 September 2021 Keywords: Boom liner Compressibility Hydraulic conducvity Leachate Shear ABSTRACT DOI: 10.22034/gjesm.2022.02.02 NUMBER OF REFERENCES 40 NUMBER OF FIGURES 7 NUMBER OF TABLES 7 Note: Discussion period for this manuscript open unl July 1, 2022 on GJESM website at the “Show Arcle.
Hydro-mechanical behavior of two clayey soils in presence of household waste leachates
Jun 29, 2023
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