
Hajer BannourGroupe Ctt
Hajer Bannour
B.Sc, M.Sc, P.h.D
About
22
Publications
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Introduction
working on hydromechanical behaviour of geosynthetic clay liners as part of composite liners with geomembranes in hydraulic and geoenvironmntal applications
Additional affiliations
October 2015 - March 2017
October 2015 - March 2017
October 2015 - March 2017
Publications
Publications (22)
Waste disposal facilities (landfills) need to be designed with two distinct and complementary barriers; polymeric and mineral low permeable materials i.e composite liners. In order to prevent contamination of subsoil and groundwater by the leachate provided by wastes, composite liners need to be installed with very strict regulations. Nonetheless,...
This study performs numerical simulations of flow rate and organic contaminant migration through a geosynthetic composite lining system (geomembrane GMB-geosynthetic clay liner GCL) using the GeoStudio program (Ctran/W in conjunction with Seep /W). The GMB is considered defective with a circular hole to account for the coupled phenomena of advectio...
The bottom and the side of a waste disposal facility (landfill) area must be designed with two distinguished and complementary barriers: active barrier and passive barrier. Passive barriers have to be designed with a very strict regulation in order to avoid the contamination of subsoils and groundwater with waste. The bottom of the area must presen...
This study presents numerical simulations of contaminants transport through a composite geomembrane geosynthetic clay liner (GMB-GCL) linings system. Organic contaminants have been studied (TCE, P-cresol). GCLs properties are considered after cation exchange and wet-dry cycles to take into account the alteration of the GCL by their environment. Res...
This study presents numerical simulations of contaminants transport through a composite geomembrane geosynthetic clay liner (GMB-GCL) linings system. Organic contaminants have been studied (TCE, P-cresol). GCLs properties are considered after cation exchange and wet dry cycles to take into account the alteration of the GCL by their environment. To...
The aim of this paper is to present empirical equations developed to calculate advective flow rates through composite liners for hydraulic and environmental applications. The situation studied is that of geomembranes (GMB) involving circular holes combined with aged geosynthetic clay liners (GCLs). Indeed, the alteration by the environment consisti...
The equivalence of composite liners involving a geomembrane (GMB) and a geosynthetic clay liner (GCL) to regulatory composite liners with a GMB and a compacted clay liner (CCL) can offer greater environmental protection to the underlying aquifer. It is suggested that GCLs and GMBs can play a very beneficial role in providing environmental protectio...
This paper, which is based on an Invited Lecture for the 7th International Conference on Environmental Geotechnics, gives an updated overview of the properties of transfer of geosynthetic liner materials used in environmental applications. To begin, the water-retention curves of geosynthetic clay liners (GCLs) are discussed, with the focus being on...
In general, interface transmissivity is obtained based on measurements of the steady-state flow in composite geomembranes (GMBs) - geosynthetic clay liners (GCLs). However, transient flow rate has not been studied prior to this study. It has been already noticed that its consideration can lead to an important increase in predicted effluent volumes...
This study presents numerical simulations of advective flow through a composite geomembrane geosynthetic clay liner (GMB-GCL). In the past, GCLs were considered homogeneous materials, but they actually consist of a special layered composite structure that combines two types of materials, geotextiles and bentonite, which are connected together by va...
This study evaluates how alteration of geosynthetic clay liners (GCLs) affects the hydraulic behaviour of a composite liner when the geomembrane presenting a hole is overlying a GCL. Interface transmissivity experiments were performed on GCL specimens that were exhumed from field sites. The results reveal different trends in the flow rates, which d...
To quantify the flow rate through multicomponent geosynthetic clay liners (GCLs), three different meter-sized specimens from different manufacturers were characterized in a dedicated experimental column. This study allows quantification of the interface transmissivity of multicomponent GCLs when the coating or attached film is damaged over an area...
Geosynthetic clay liners (GCLs) are placed at the bottom of waste disposal facilities where they hydrate from the subsoil and eventually from a hydraulic head on geomembranes (GMs) defects. Predicting hydration behavior of GCLs requires knowledge of the water-retention properties of the GCL along wetting paths. Given that GCLs could be subjected to...
L’étanchéité composite géomembrane (GM)-géosynthétique bentonitique (GSB) mise en place dans les barrières de fond d’installations de stockage de déchets non dangereux (ISDnD) peut être sujette à des transferts advectifs liés à l’existence de défauts dans la GM. Les lixiviats peuvent percoler dans le GSB, pénétrer dans le sol et les nappes phréatiq...
The main focus of this paper is to develop a new methodology for simply determining water retention curves (WRCs) of geosynthetic clay liner (GCLs) under high suction values. To this end, tests were conducted using vapor equilibrium method using over saturated salt solutions. This controlled suction technique is broadly in line with the suction gap...
Some studies were performed in the past years regarding the behavior of geosynthetic clay liners (GCLs) as
part of a composite liner, focused on the situation where a GCL is located under a hole in a high density
polyethylene (HDPE) geomembrane (GM). In this case, the contact between the geomembrane and the GCL was quantified in terms of flow rate...
Three different multicomponent geosynthetic clay liners (GCLs) from different manufacturers are tested in a transmissivity cell with a new testing procedure to quantify the flow rate and the interface transmissivity between the coating or attached film presenting a hole and the upper geotextile of the GCL. The testing device was previously used in...
Some studies were performed in the past years regarding the behaviour of geosynthetic
clay liners (GCLs) as part of a composite liner composed by a GCL located under a high density
polyethylene (HDPE) geomembrane (GM) exhibiting a hole. In this case, the contact between the GM
and the GCL was quantified in terms of flow rate and interface transmiss...
Three different multicomponent geosynthetic clay liners (GCLs) from different manufacturers are tested in a transmissivity cell with a new testing procedure to quantify the flow rate and the interface transmissivity between the coating or attached film presenting a hole and the upper geotextile of the GCL. The testing device was previously used in...