Coupled discrete element and finite volume solution of two classical soil mechanics problems

Feng, Chun-Mei; Drumm, Eric C.; Guiochon, Georges

doi:10.1016/j.compgeo.2011.03.009

Cited by 63 publications

(32 citation statements)

References 12 publications

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“…According to Ergun (1952), McCabe et al (2005) and Chen et al (2011), the hydraulic conductivity of the slope mass is calculated as K ¼ d 2 p n 3 q f g 150l f ð1ÀnÞ 2 . Based on the parameters used in this simulation, the average hydraulic conductivity of the model is 46506.7 cm/s, which is unrealistically large when compared to that of normal pervious materials (e.g.…”

Section: Discussionmentioning

confidence: 99%

“…The DEM and CFD open source codes ESyS-Particle (Weatherley et al 2011;Abe et al 2004) and OpenFOAM (OpenCFD 2004) were employed for the simulations presented here. The coupling algorithm from Chen et al (2011) originally written in YADE (Šmilauer et al 2010) was implemented in ESySParticle by the authors. The detailed validation of the proposed DEM-CFD model is not included in the current paper.…”

Section: Theory and Methodologymentioning

confidence: 99%

“…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%

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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: Discussionmentioning

confidence: 99%

Section: Theory and Methodologymentioning

confidence: 99%

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

2015

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“…The equations governing a fluid-solid mixture system are derived from the theory of multiphase flow [27,31]. Figure 1 illustrates the components of the mixture, which consists of fluid, and particles.…”

Section: Theory and Methodologymentioning

confidence: 99%

“…Consequently, the Discrete Element Method (DEM) [25] and Computational Fluid Dynamics (CFD) [26] techniques can be used to study the mechanical and hydraulic behaviour of particles and fluid flow, respectively. By coupling these two methods, a complete analysis of the sedimentation of a fluid-solid mixture system can be achieved [27].…”

Section: Introductionmentioning

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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Numerical simulation of backward erosion piping in heterogeneous fields

Liang

Yeh

Wang

et al. 2017

Water Resources Research

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Backward erosion piping (BEP) is one of the major causes of seepage failures in levees. Seepage fields dictate the BEP behaviors and are influenced by the heterogeneity of soil properties. To investigate the effects of the heterogeneity on the seepage failures, we develop a numerical algorithm and conduct simulations to study BEP progressions in geologic media with spatially stochastic parameters. Specifically, the void ratio e, the hydraulic conductivity k, and the ratio of the particle contents r of the media are represented as the stochastic variables. They are characterized by means and variances, the spatial correlation structures, and the cross correlation between variables. Results of the simulations reveal that the heterogeneity accelerates the development of preferential flow paths, which profoundly increase the likelihood of seepage failures. To account for unknown heterogeneity, we define the probability of the seepage instability (PI) to evaluate the failure potential of a given site. Using Monte‐Carlo simulation (MCS), we demonstrate that the PI value is significantly influenced by the mean and the variance of ln k and its spatial correlation scales. But the other parameters, such as means and variances of e and r, and their cross correlation, have minor impacts. Based on PI analyses, we introduce a risk rating system to classify the field into different regions according to risk levels. This rating system is useful for seepage failures prevention and assists decision making when BEP occurs.

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Coupled discrete element and finite volume solution of two classical soil mechanics problems

Cited by 63 publications

References 12 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

Numerical simulation of backward erosion piping in heterogeneous fields

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