Approaches to determine the constriction size distribution for understanding filtration phenomena in granular materials

Vincens, Éric; Witt, Karl Josef; Homberg, Ulrike

doi:10.1007/s11440-014-0308-1

Cited by 56 publications

(32 citation statements)

References 23 publications

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“…Complementary to these particle-based approaches, constriction size distribution (CSD) curves were defined to account for the transport properties of granular materials (Li et al, 2014, Sjah and Vincens, 2013, To and Scheuermann, 2014, Vincens et al, 2015. These approaches describe the void space in terms of accessible volumes for particles of different sizes.…”

Section: Introductionmentioning

confidence: 99%

Scale separation between grain detachment and grain transport in granular media subjected to an internal flow

Wautier

Bonelli²,

Nicot

2017

Granular Matter

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Based on a discrete element method (DEM), this paper investigates the basic mechanisms and the associated scales related to grain detachment and grain transport processes at stake in widely graded poly-disperse assemblies of spheres subjected to internal fluid flows. From the identification of force chains, particles sensitive to grain detachment are identified. Based on the computation of autocorrelation lengths, a typical length scale associated with this phenomenon is then defined. From the characterization of the void space as a pore network, particles eligible for grain transport are identified among the detachable particles. Based on the definition of a mean travel distance, the typical length scale associated with grain transport is finally characterized. The comparison between the two length scales highlights a scale separation between grain detachment and grain transport.

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Section: Introductionmentioning

confidence: 99%

Scale separation between grain detachment and grain transport in granular media subjected to an internal flow

Wautier

Bonelli²,

Nicot

2017

Granular Matter

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“…However, according to Li and Fannin [13] and also Wan and Fell [31], the most widely used geometric methods are conservative. Nowadays, research works are still carried out concerning such geometric criteria; they aim, for instance, to take into account rather the size distribution of constrictions than directly the grain size distribution [30], or the degree of interlocking of fines by neighbouring particles in relation to their involvement in the stress transmission by the granular skeleton [19,24].…”

Section: Introductionmentioning

confidence: 99%

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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“…As a result, the complex description of the pore space can be reduced to the definition of a graph composed of pores (the nodes of the graph) and constrictions (the edges of the graph). The definition of this graph is derived from a tessellation of the granular assembly as in [4] and [6], and Figure 3 provides an illustration of this type of graph for simple grains assemblies. The pores are defined following the level 0 analysis introduced in [4].…”

Section: Mesoscale Analysis Of the Grain Transport Mechanismmentioning

confidence: 99%

A micromechanical approach of suffusion based on a length scale analysis of the grain detachment and grain transport processes.

Wautier

Bonelli²,

Nicot

2017

EPJ Web Conf.

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Suffusion is the selective erosion of the finest particles of a soil subjected to an internal flow. Among the four types of internal erosion and piping identified today, suffusion is the least understood. Indeed, there is a lack of micromechanical approaches for identifying the critical microstructural parameters responsible for this process. Based on a discrete element modeling of non cohesive granular assemblies, specific micromechanical tools are developed in a unified framework to account for the two first steps of suffusion, namely the grain detachment and the grain transport processes. Thanks to the use of an enhanced force chain definition and autocorrelation functions the typical lengths scales associated with grain detachment are characterized. From the definition of transport paths based on a graph description of the pore space the typical lengths scales associated with grain transport are recovered. For a uniform grain size distribution, a separation of scales between these two processes exists for the finest particles of a soil

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Approaches to determine the constriction size distribution for understanding filtration phenomena in granular materials

Cited by 56 publications

References 23 publications

Scale separation between grain detachment and grain transport in granular media subjected to an internal flow

Scale separation between grain detachment and grain transport in granular media subjected to an internal flow

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

A micromechanical approach of suffusion based on a length scale analysis of the grain detachment and grain transport processes.

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