
Fateh BendahmanePolytech Nantes · Civil Engineering
Fateh Bendahmane
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Publications (50)
Among the four dominant mechanisms of internal erosion, suffusion appears as one of the most complex. It is indeed the result of the combination of three processes: dislodgement of fine particles, transport of them, and filtration of some fluidized fine particles. These processes depend on the soil’s stress state and on the hydraulic gradient path....
Les instabilités et les ruptures que peuvent subir les digues et les barrages en remblais sont très majoritairement dues aux processus d’érosion externe (surverse) et d’érosion interne (renard hydraulique, érosion régressive, érosion de contact ou suffusion). Cette étude porte sur la suffusion qui peut mobiliser la fraction fine de sols pulvérulent...
The present study addresses the characterization of long-term and durability properties for employment in road subgrade construction of geopolymer-treated sediments. Four mixtures are presently selected based on a previous study: untreated sediment, sediment treated with 2% hydraulic lime (L) and 7% ordinary Portland cement OPC, and two geopolymer-...
Evaluation of shear strength characteristics of coarse-grained soils by performing laboratory tests resorts often to a scalping or scalping/replacement procedure due to the presence of oversized particles in comparison with the device size. This work aimed to study consequences of these two procedures on the resulting shear strength characteristics...
Suffusion is a selective erosion of fine particles within the matrix of coarse soil particles under the effect of seepage flow. Suffusion can induce important modifications in the hydraulic and mechanical characteristics of the soil. At the scale of an earth structure, the flow direction can vary, and the soils that compose the structure and its fo...
Suffusion is the process of selective erosion of fine particles within the matrix of coarse soil particles under the effect of seepage flow. Suffusion can induce important modifications in the hydraulic and mechanical characteristics of the soil in different flow directions. Thus, to ensure the safety assessment of hydraulic earth structures, the e...
Two means physical processes are involved in failure of a dams structure: either a mechanical failure by sliding, or a hydraulic failure by erosion. The causes of failures are internal erosion (23 cases between 44), or external erosion (20 cases of overtopping) and 1 case of sliding. In consequence, internal erosion is the most frequent cause for a...
Internal erosion processes in earth structures and their foundations may increase the failure risk of such structures. Suffusion, one of the main internal erosion processes, selectively erodes the fine particles that move through the voids formed by the coarser particles. In literature, several suffusion susceptibility investigations were already p...
Cob is a vernacular earth-building technique which has encountered renewed interest for its low environmental impact compared to conventional construction materials. Relevant mechanical characterisation is essential for cob building structure design and calculation. This paper presents an improved laboratory procedure to better the characterisation...
Sediments valorization (recycling) has revealed limitations due to different restrains and practical difficulties. When it comes to different recovery methods, the possibility of valuing diverse types of sediments still needs to be defined. Using a statistical approach, the present study aims to quantitatively estimate the mechanical resistance of...
Internal erosion is one of the main causes of instabilities within hydraulic earth structures. Four internal erosion processes can be distinguished, and this study deals with the process of suffusion, which corresponds to the coupled processes of detachment–transport–filtration of the soil’s fine fraction between the coarse fraction. Because of the...
Suffusion process corresponds to the coupled processes of detachment-transport-filtration of the soil's fine fraction within the voids between the coarse fraction. Because of the great length of earth structures and because of the heterogeneities of soils, it is very difficult to characterize the suffusion susceptibility of soils all along the eart...
Suffusion and global backward erosion are two of the main internal erosion processes in earth structures and their foundations which may increase their failure risk. For other processes of internal erosion, different classifications exist in order to evaluate the soil erodibility, whereas in the case of suffusion and global backward erosion, no sus...
Suffusion involves a selective erosion of fine particles in a soil by the
water seepage in the matrix formed by coarser particles. This phenomenon can
induce a change in particle size distribution, porosity and hydraulic conductivity of
the material. With the objective to characterize the soil sensibility and propose
suffusion sensibility classific...
The complex phenomenon of suffusion corresponds to the process of detachment and then transport of the finest particles within the soil porous network. Suffusion may cause changes in porosity and can also lead to important modifications in the hydraulic and mechanical characteristics of the soil. With the aim to evaluate the likelihood of suffusion...
An experimental program was set up to study the suffusion process by using a triaxial erodimeter developed in our laboratory. This device is equipped with a multichannel optical sensor in order to characterize precisely the initiation and development of suffusion process. With the objective to characterize the erodibility of clayey sand, tests were...
This paper deals with suffusion process also named internal instability, which takes place inside the soil skeleton. In this process, finer particles of a soil migrate within its own pore spaces. These fine particles can be cohesionless particles or clay particles. With the objective to study the effect of angularity of coarse fraction grains on su...
Erosion is one of the main causes of instabilities within hydraulic earth structures as dams, dikes or levees. Two typeserosion types can be distinguished: suffusion which occurs within the soil matrix and interface erosion at the interface
between soil and water or between two materials having different grain size distributions. This paper deals...
An optical sensor was designed to measure the fine solid particles concentration contained in a fluid flow. This sensor is composed of four light-emitting diodes and four associated light-dependent resistors, allowing the measurement of fluid transparency. Given the small device dimensions, it can be placed close to the particles exit from the spec...
Under the effect of internal flows, a liner can undergo a washing out of particles, which modifies the particle size distribution and affects hydraulic, chemical and mechanical characteristics. This paper discusses the effects of internal flows on sand/kaolin mixture, in terms of rate of erosion and modification of the hydraulic conductivity. A par...
Within hydraulic earth structures (dikes, levees, or dams), internal seepage flows can generate the entrainment of the soil grains. Grain transportation affects both particle size distributions and porosity, and changes the mechanical and hydraulic characteristics of the earth's structure. The occurrence of failures in new earth structures due to i...
The appearance of breaches in recent hydraulic earthstructures due to internal erosion confirms that improving our physical understanding of the phenomenon is urgent. Under the effect of internal flows, earthstructures can undergo a migration of their particles, which modifies the particle size distribution and affects both hydraulic and mechanical...
L'érosion interne est l'une des principales causes des instabilités d'ouvrages hydrauliques en terre (digue, levée,barrage ...). Les désordres constatés sur des ouvrages récents soulignent la nécessité d'une meilleure compréhension et quantification des phénomènes qui régissent l'érosion interne. L'entraînement et le transport de grains par les éco...
Internal erosion is one of the main causes of instabilities within hydraulic earth structures (dike, levee, dam,...). The occurrence of breach in new structures underlines the urgency to quantify phenomena induced by internal erosion. Entrainment and migration of some particles under flow affect the porosity and grain size distribution, which chang...
Under the internal flow, hydraulic earthstructure (dike, levee, or dam) can incur a migration of particles. This migration induced a modification of particles size distribution and a variation of hydraulical and mechanic characteristics. This modification can generate instabilities: sliding, overtopping or even failures. The occurrence of breach in...
L'érosion interne est l'une des principales causes des instabilités d'ouvrages hydrauliques en terre : digue, levée, barrage. L'arrachement et le transport de grains par les écoulements internes affectent la distribution granulométrique, modifient la porosité ainsi que les caractéristiques mécaniques et hydrauliques. Cette migration de grains peut...
L'érosion interne est l'une des principales causes des instabilités d'ouvrages hydrauliques en terre (digue, levée, barrage ...). Les désordres constatés sur des ouvrages récents soulignent la nécessité d'une meilleure compréhension et quantification des phénomènes qui régissent l'érosion interne. L'entraînement et le transport de grains par les éc...
Under the action of an internal flow, some particles of the hydraulic earthwork (dyke, levee or dam) can migrate. This migration causes a modification of granulometry and porosity of the soil, which creates a variation of the hydraulic and mechanical characteristics. These modifications can induce a leakage, a sliding, an overtopping and even a rup...
Sous l'action d'un écoulement interne, un ouvrage hydraulique en terre (digue, levée ou barrage) peut être sujet à un arrachement et une migration de ses grains. Cette migration provoque une modification de la granulométrie et de la porosité du sol qui induit une variation des caractéristiques hydrauliques et mécaniques. A plus ou moins long terme,...