A continuum‐discrete hydromechanical analysis of granular deposit liquefaction

Zeghal, Mourad; Shamy, Usama El

doi:10.1002/nag.390

Cited by 81 publications

(51 citation statements)

References 29 publications

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“…The hydrostatic force acting on a single particle, i, accounts for the influence of fluid pressure gradient around the particle (i.e. buoyancy) (Chen et al 2011;Kafui et al 2011;Zeghal and El Shamy 2004), as shown in Eq. (3).…”

Section: Fluid-particle Interactionmentioning

confidence: 99%

Rockslide and Impulse Wave Modelling in the Vajont Reservoir by DEM-CFD Analyses

2015

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This paper investigates the generation of hydrodynamic water waves due to rockslides plunging into a water reservoir. Quasi-3D DEM analyses in plane strain by a coupled DEM-CFD code are adopted to simulate the rockslide from its onset to the impact with the still water and the subsequent generation of the wave. The employed numerical tools and upscaling of hydraulic properties allow predicting a physical response in broad agreement with the observations notwithstanding the assumptions and characteristics of the adopted methods. The results obtained by the DEM-CFD coupled approach are compared to those published in the literature and those presented by Crosta et al. (Landslide spreading, impulse waves and modelling of the Vajont rockslide. Rock mechanics, 2014) in a companion paper obtained through an ALE-FEM method. Analyses performed along two cross sections are representative of the limit conditions of the eastern and western slope sectors. The max rockslide average velocity and the water wave velocity reach ca. 22 and 20 m/s, respectively. The maximum computed run up amounts to ca. 120 and 170 m for the eastern and western lobe cross sections, respectively. These values are reasonably similar to those recorded during the event (i.e. ca. 130 and 190 m, respectively). Therefore, the overall study lays out a possible DEM-CFD framework for the modelling of the generation of the hydrodynamic wave due to the impact of a rapid moving rockslide or rock-debris avalanche.

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Section: Fluid-particle Interactionmentioning

confidence: 99%

Rockslide and Impulse Wave Modelling in the Vajont Reservoir by DEM-CFD Analyses

2015

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“…The hydrostatic force accounts for the fluid pressure gradient around an individual particle (i.e. buoyancy) [27,40,41], expressed as:…”

Section: Fluid-particle Interactionmentioning

confidence: 99%

Investigation of granular batch sedimentation via DEM–CFD coupling

2014

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process, the excess pore water pressure initially increases rapidly to a peak value, and then dissipates gradually to zero. Meanwhile, the compressibility of the sediments decreases slowly as a soil layer builds up at the bottom. Consolidation of the deposited layer is caused by the self-weight of grains, while the compressibility of the sample decreases progressively.Keywords: granular batch sedimentation, DEM-CFD coupling, segregation, pore water pressure, effective stress, compressibility IntroductionThe sedimentation and consolidation processes of granular materials are common in both terrestrial and submerged environments. In the natural environment, granular materials often settle continuously towards the seabed, lake or river floor to form a loose sediment layer. As the skeleton of the sediment layer is extremely compressible, it undergoes relatively large strain under additional loads. Sedimentation processes are very important for solid-liquid 1 2

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“…The amount of this force can be estimated by using semi-empirical equations. The Ergun's equation is one of the most well-known equations in this field [2,5] which can be used to estimate the drag force on particles from laminar to turbulent flow. Thus, the total force acting on each particle in a fluid cell is:…”

Section: Coupled Fluid-dem Algorithmmentioning

confidence: 99%

“…In their proposed method a background mesh is considered for the fluid phase and continuity and momentum (Navier-Stokes) equations were solved to calculate the averaged velocity and pressure of the fluid on those fixed coarse grids; the fluid equations can take into account the solid part as their porosity. Shimizu [4] added thermal equations to this scheme, and Zeghal and Shamy [5] implemented this approach to look at pore pressure generation in granular deposits under shaking loading. They observed the generated pore pressure and velocity in dynamic conditions in sandy soil and pointed out that fluid velocity in their examples does not exceed laminar regime.…”

Section: Introductionmentioning

confidence: 99%

Fluid coupling in DEM simulation using Darcy's law: Formulation, and verification

Goodarzi¹,

Kwok²,

Tham³

et al. 2013

AIP Conference Proceedings

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Abstract. The fluid coupled-DEM has recently become a popular topic in the field of granular material simulation. In most simulations, the averaged Navier-Stokes equations are implemented to consider the fluid flow through particles. In this paper, a simple algorithm based on Darcy's law was discussed to avoid expensive computational effort of solving of the Navier-Stokes equations. The results of this approach were compared quantitatively with the well-known analytical solution of 1D seepage through a soil column as a fully coupled problem in geotechnical engineering. The comparison between the developed pore pressure and induced displacement with analytical values revealed that this algorithm is capable of simulating fluid-particle interaction accurately within the laminar regime.

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A continuum‐discrete hydromechanical analysis of granular deposit liquefaction

Cited by 81 publications

References 29 publications

Rockslide and Impulse Wave Modelling in the Vajont Reservoir by DEM-CFD Analyses

Rockslide and Impulse Wave Modelling in the Vajont Reservoir by DEM-CFD Analyses

Investigation of granular batch sedimentation via DEM–CFD coupling

Fluid coupling in DEM simulation using Darcy's law: Formulation, and verification

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