Hydro-mechanical behavior of two clayey soils in presence of household waste leachates

BACKGROUND AND OBJECTIVESIn 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 stu...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	H. Yonli, B. François, D. Toguyeni, A. Pantet
Formato:	article
Lenguaje:	EN
Publicado:	GJESM Publisher 2022
Materias:	bottom liner compressibility hydraulic conductivity leachate shear Environmental sciences GE1-350
Acceso en línea:	https://doaj.org/article/7cf13b73a46c49c3868dc8c21109f1ee
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:7cf13b73a46c49c3868dc8c21109f1ee
record_format	dspace
spelling	oai:doaj.org-article:7cf13b73a46c49c3868dc8c21109f1ee2021-11-17T10:35:02ZHydro-mechanical behavior of two clayey soils in presence of household waste leachates2383-35722383-386610.22034/GJESM.2022.02.02https://doaj.org/article/7cf13b73a46c49c3868dc8c21109f1ee2022-04-01T00:00:00Zhttps://www.gjesm.net/article_246026_c861a04c479873f88abdfdbbc43b06e6.pdfhttps://doaj.org/toc/2383-3572https://doaj.org/toc/2383-3866BACKGROUND AND OBJECTIVESIn 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.METHODSTwo 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.FINDINGSLeachate 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°.CONCLUSIONThis 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.H. YonliB. FrançoisD. ToguyeniA. PantetGJESM Publisherarticlebottom linercompressibilityhydraulic conductivityleachateshearEnvironmental sciencesGE1-350ENGlobal Journal of Environmental Science and Management, Vol 8, Iss 2, Pp 169-182 (2022)
institution	DOAJ
collection	DOAJ
language	EN
topic	bottom liner compressibility hydraulic conductivity leachate shear Environmental sciences GE1-350
spellingShingle	bottom liner compressibility hydraulic conductivity leachate shear Environmental sciences GE1-350 H. Yonli B. François D. Toguyeni A. Pantet Hydro-mechanical behavior of two clayey soils in presence of household waste leachates
description	BACKGROUND AND OBJECTIVESIn 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.METHODSTwo 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.FINDINGSLeachate 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°.CONCLUSIONThis 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.
format	article
author	H. Yonli B. François D. Toguyeni A. Pantet
author_facet	H. Yonli B. François D. Toguyeni A. Pantet
author_sort	H. Yonli
title	Hydro-mechanical behavior of two clayey soils in presence of household waste leachates
title_short	Hydro-mechanical behavior of two clayey soils in presence of household waste leachates
title_full	Hydro-mechanical behavior of two clayey soils in presence of household waste leachates
title_fullStr	Hydro-mechanical behavior of two clayey soils in presence of household waste leachates
title_full_unstemmed	Hydro-mechanical behavior of two clayey soils in presence of household waste leachates
title_sort	hydro-mechanical behavior of two clayey soils in presence of household waste leachates
publisher	GJESM Publisher
publishDate	2022
url	https://doaj.org/article/7cf13b73a46c49c3868dc8c21109f1ee
work_keys_str_mv	AT hyonli hydromechanicalbehavioroftwoclayeysoilsinpresenceofhouseholdwasteleachates AT bfrancois hydromechanicalbehavioroftwoclayeysoilsinpresenceofhouseholdwasteleachates AT dtoguyeni hydromechanicalbehavioroftwoclayeysoilsinpresenceofhouseholdwasteleachates AT apantet hydromechanicalbehavioroftwoclayeysoilsinpresenceofhouseholdwasteleachates
_version_	1718425620107493376

Hydro-mechanical behavior of two clayey soils in presence of household waste leachates

Ejemplares similares