Suffusion tests on cohesionless granular matter

Sail, Yacine; Marot, Didier; Sibille, Luc; Alexis, Alain

doi:10.1080/19648189.2011.9693366

Cited by 24 publications

(23 citation statements)

References 9 publications

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“…They named it failure. Besides, it has been shown in Sail et al [22] that the suffusion process of the first erosion phase, always for G4-C mixture, is eventually accompanied locally by a filtration of some transported particles resulting in a partial clogging of the interstitial space and the generation of interstitial overpressure in the clogging zone. The second erosion phase is then initiated by the interstitial overpressure causing the blowout of the clogging and washing out all the fine particles in the corresponding zone.…”

Section: A Two-phase Erosion Processmentioning

confidence: 99%

“…The collecting system, downstream of the cell, includes an effluent tank with an overflow outlet (to control the downstream hydraulic head) and is equipped with a rotating sampling system containing nine beakers for the sampling of eroded particles carried with the effluent. The detail of each component is reported in Sail et al [22].…”

Section: Experimental Device and Test Proceduresmentioning

confidence: 99%

“…The gamma-ray radiations, used for density measurements, cover on the peripheral surface of the specimen a circular area with a radius of 25 mm [22]. As in this case of G4-C mixture, the second erosion phase is localized (Fig.…”

Section: A Two-phase Erosion Processmentioning

confidence: 99%

“…With the aim to characterize the hydraulic loading and the corresponding soil response, a specific bench was designed [22] and a series of tests was performed on mixtures of glass beads with two different fine particle contents. To consider different loading histories, the applied hydraulic gradient for each test was increased by stages according to different values of amplitude and duration.…”

Section: Introductionmentioning

confidence: 99%

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A description of internal erosion by suffusion and induced settlements on cohesionless granular matter

2015

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International audienceCohesionless granular matter subjected to internal flow can incur an internal erosion by suffusion characterized by a migration of its finest constituting particles. A series of suffusion tests is performed on assemblies of gap graded glass beads using a large oedo-permeameter device. Two successive processes of erosion can be observed during the tests. First, a suffusion process is characterized by a progressive and diffuse migration of fine particles over a long time period. The second process, induced by the first one, is characterized by a strong migration over a short time period (blowout of fine particles) and produces rapidly large settlement of specimen. Time series of hydraulic conductivity, longitudinal profile of specimen density, eroded mass and axial deformation are analyzed. The initial content of fine particles and the history of hydraulic loading appear as key parameters in the suffusion development. To characterize the suffusion development, erosion rate is investigated according to the power expended by the seepage flow, and a new law of erosion by suffusion is proposed

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Section: A Two-phase Erosion Processmentioning

confidence: 99%

Section: Experimental Device and Test Proceduresmentioning

confidence: 99%

Section: A Two-phase Erosion Processmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A description of internal erosion by suffusion and induced settlements on cohesionless granular matter

2015

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“…The internal diameter (D) of rigid-wall devices has varied to a maximum diameter of 275 mm or greater (see for example, Kenney Sail et al, 2011). A ratio D/D100 ≤ 8 to 12 is typically respected in matching the grain size distribution of a test specimen to permeameter device, to achieve general accordance with ASTM D-2434.…”

Section: General Attributes Of Permeameter Test Devicesmentioning

confidence: 99%

Conceptual considerations of evaluate internal erosion phenomenon via no-erosion filter test and continuing erosion filter test

Ramos-Rivera

Echeverri-Ramírez

2016

E3S Web Conf.

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Abstract. Some widely-graded soils may exhibit, under the influence of steady seepage flow, a behaviour in which grains of the finer fraction migrate through the interstices of the matrix formed by the coarser fraction. The migrating fines may accumulate at a downstream location within the soil. Alternatively, and where there is no capacity for retention at the downstream or exit boundary, the behaviour may lead to a washing out and consequent loss of the finer fraction. The phenomenon of erosion is termed internal instability, and the soils are considered internally unstable. Taking into consideration (i) the specimen reconstitution by method of compaction, (ii) the application of a vertical stress to the specimen, and (iii) the use of multi-stage seepage flow with head-control, to measure the origin of a conduit through the coarser fraction, some test devices were conducted by different authors to evaluate this phenomenon, the purpose of this paper is to present some considerations and key aspects about internal erosion in dams and filter compatibility with core material (specimen reconstitution, test procedure, consolidation, seepage flow, test program and its relevance to the reality). The main reason to present this investigation is due to the absence of any specified regulatory or standard test method. Given the importance of filter compatibility of the zoned earth core dam and filter materials, as well the grading stability of each zone in the presence of seepage flow, additional consideration will be given to performing Continuing Erosion Filter (CEF) tests on the core-filter interface, using the laboratory permeameter device.

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Internal erosion in granular media: direct numerical simulations and energy interpretation

Sibille

Lominé

Poullain

et al. 2014

Hydrological Processes

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Internal erosion in soils is characterized by a first step of detachment of solid particles from the granular skeleton under the action of a water seepage; then the detached particles are transported with the water flow. For some erosion processes, as suffusion, transported particles may finally be redeposited within the interstitial space of the soil itself acting as a filter. This paper focuses on the analysis and the description of the two first steps of particle detachment and transport in the cases of erosion by suffusion and piping erosion. The analysis is mainly based on direct numerical simulations performed with a fully coupled discrete element-lattice Boltzmann method (DE-LB method). Inter-particle interactions occurring in the solid granular phase are described with the discrete element method, whereas dynamics of the water flow is solved with the lattice Boltzmann method. Simulation results show that internal erosion of the solid phase can be described either from the hydraulic shear stress or from the power expended by the water seepage.The latter description based on the flow power is finally compared with experimental results from laboratory tests.

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Suffusion tests on cohesionless granular matter

Cited by 24 publications

References 9 publications

A description of internal erosion by suffusion and induced settlements on cohesionless granular matter

A description of internal erosion by suffusion and induced settlements on cohesionless granular matter

Conceptual considerations of evaluate internal erosion phenomenon via no-erosion filter test and continuing erosion filter test

Internal erosion in granular media: direct numerical simulations and energy interpretation

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