Fluid coupled-DEM modelling of undrained behavior of granular media

Shafipour, Roozbeh; Soroush, Abbas

doi:10.1016/j.compgeo.2007.12.003

Cited by 73 publications

(29 citation statements)

References 11 publications

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“…consists of two parts: hydrostatic and hydrodynamic forces (Shafipour and Soroush 2008). The hydrostatic force acting on a single particle, i, accounts for the influence of fluid pressure gradient around the particle (i.e.…”

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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“…hydrostatic and hydrodynamic forces [39]. The hydrostatic force accounts for the fluid pressure gradient around an individual particle (i.e.…”

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 comparison of undrained behaviour using constant volume and fluid-particle interaction methods showed no difference essentially as indicated [6] [7]. Of all the above researchers, temporary liquefaction is observed only in [6] [7]. It should be noted that the undrained condition modeled by constant volume method is only suitable for saturated soil samples, not for unsaturated samples.…”

Section: Introductionmentioning

confidence: 99%

“…The undrained behaviour was modeled using 2D DEM by [4]- [7] among others. Most of these researchers use 2D constant volume simulations for mimicking undrained saturated soil tests, except that both constant volume and coupled fluid-particle interaction methods are used in [6] [7]. The comparison of undrained behaviour using constant volume and fluid-particle interaction methods showed no difference essentially as indicated [6] [7].…”

Section: Introductionmentioning

confidence: 99%

DEM Simulations of Granular Soils under Undrained Triaxial Compression and Plane Strain

Gong¹

2015

JAMP

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The paper presents 3D DEM simulation results of undrained tests for loose assemblies with varied porosities under both triaxial compression and plane strain conditions, using a periodic cell. The undrained tests were modelled by deforming the samples under constant volume conditions, which corresponds to saturated soil samples. The undrained stress paths are shown to be qualitatively similar to physical experimental results. The triggering of liquefaction and temporary liquefaction is identified by a microscopic parameter with redundancy factor (RF) equal to unity, which defines the transition from "solid-like" to "liquid-like" behaviour. The undrained behaviour of granular soils is found to be mainly governed by the evolution of redundancy factor, and a reversal of deviatoric stress in stress path (temporary liquefaction) is found to be due to temporary loss of contacts forming a structural mechanism in the system where RF is smaller than unity during the evolution.

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Fluid coupled-DEM modelling of undrained behavior of granular media

Cited by 73 publications

References 11 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

DEM Simulations of Granular Soils under Undrained Triaxial Compression and Plane Strain

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