Micromechanical analysis of capillary suction effect on bearing capacity of unsaturated fine granular foundation soil using coupled CFD-DEM method

Yu, Peng; Yin, Zhen‐Yu; Zhou, Chi; Ding, Xuanming

doi:10.1016/j.compgeo.2022.105092

Cited by 20 publications

(8 citation statements)

References 76 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Capillary actions are known to strongly influence the strength and flow properties of granular materials 1 – 4 , thus playing a fundamental role in several natural and engineering applications (e.g. slope stability 5 , earth construction 6 , building foundations 7 , caking in pharmaceutics 8 and agriculture 9 to name a few). These actions rise at the interfacial equilibrium (i.e.…”

Section: Background and Summarymentioning

confidence: 99%

Micro computed tomography images of capillary actions in rough and irregular granular materials

Nadimi,

Mendes,

López

et al. 2024

Sci Data

View full text Add to dashboard Cite

The present work investigates the effect of both surface roughness and particle morphology on the retention behaviour of granular materials via X-ray micro-computed tomography (µCT) observations. X-ray µCT images were taken on two types of spherical glass beads (i.e. smooth and rough) and two different sands (i.e. natural and roughened). Each sample was subjected to drainage and soaking paths consisting in a multiphase ‘static’ flow of potassium iodine (KI) brine (wetting phase) and dry air (non-wetting phase). Tomograms were obtained at different saturation states ranging from fully brine saturated to air dry conditions with 6.2 μm voxel size resolution. The data acquisition and pre-processing are here described while all data, a total of 48 tomograms, are made publicly available. The combined dataset offers new opportunities to study the influence of surface roughness and particle morphology on capillary actions as well as supporting validation of pore-scale models of multiphase flow in granular materials.

show abstract

Section: Background and Summarymentioning

confidence: 99%

Micro computed tomography images of capillary actions in rough and irregular granular materials

Nadimi,

Mendes,

López

et al. 2024

Sci Data

View full text Add to dashboard Cite

show abstract

“…Other important parameters used in the simulation can be found in Table 2. 45 A diagrammatic sketch of fines being washed away under the upward flow is shown in Figure 7.…”

Section: F I G U R Ementioning

confidence: 99%

“…Prior to the launch of the erosion, the top rigid wall is replaced with a permeable filter containing holes of 1.2 mm × 1.2 mm, allowing fine particles to pass freely while coarse particles are held back. Other important parameters used in the simulation can be found in Table 2 45 . A diagrammatic sketch of fines being washed away under the upward flow is shown in Figure 7.…”

Section: Model Setup and Parameter Selectionmentioning

confidence: 99%

Effect of particle shape and bedding angle on suffusion in gap‐graded granular soils by coupled CFD‐DEM method

Zhou

Qian

Yin

et al. 2023

Num Anal Meth Geomechanics

Self Cite

View full text Add to dashboard Cite

The natural deposition of soils results in significant fabric anisotropy, and its influence on suffusion remains unclear. In this study, a series of gap-graded soil samples with different particle shapes and bedding angles are generated and implemented into the coupled computational fluid dynamics-discrete element method (CFD-DEM) simulations to investigate the migration of fine particles within the coarse grain matrix. Macroscopic results, including mass loss, void ratio variation, and soil deformation, as well as microscopic particle trajectory, force chain network, and contact orientation are analyzed. In addition, drained triaxial tests on samples before and after erosion are carried out. All results turn out that the greater the bedding angle, the more severe the loss of fines and the more significant the soil deformation. Three different migration characteristics can be identified according to soil anisotropy degree, that is, when the bedding angle is 0 • , the migration of fine particles remains relatively stable; when the bedding angle is 30 • and 60 • , the particle migration shows a gradual change throughout the erosion; when the bedding angle is 90 • , the fine particles migrate significantly in the very early stages of suffusion. Besides, the aspect ratio (AR) of the particle is found to be beneficial for both erosion resistance and soil strength.

show abstract

“…Several numerical techniques have been proposed in the literature to model such fluid-solid interaction, and the combination of the discrete element method (DEM) with the fluid module stands out for its exceptional ability to reveal the prevailing microscopic mechanisms. According to the mathematical principle of the constituent fluid module, the DEM-based coupling themes are mainly composed of CFD-DEM, [5][6][7][8][9][10] fluid-DEM, [11][12][13][14][15] LBM-DEM, [16][17][18][19][20][21] PNM-DEM, [22][23][24][25][26][27] SPH-DEM, [28][29][30][31][32][33] and so on. Owing to the comparative advantages of being sufficiently intuitive and accurate, the CFD-DEM coupling method based on the locally averaged Navier-Stokes equations frequently performs as an effective approach for the imitation of micro-scale fluid-solid interactions.…”

Section: Introductionmentioning

confidence: 99%

A novel unresolved/semi‐resolved CFD‐DEM coupling method with dynamic unstructured mesh

He,

Li,

Chen

2024

Num Anal Meth Geomechanics

View full text Add to dashboard Cite

The greatest challenge when performing large deformation simulations using the CFD‐DEM coupling method lies in the dynamical update of the fluid meshes. To address this problem, a novel CFD‐DEM coupling method integrated with the dynamic unstructured grid is proposed in this work. The mesh initialization and reconstruction are performed by the Constrained Delaunay triangulation (CDT) implemented by the tetgen algorithm. Moreover, the equation of state (EOS) is introduced to consider the impact of fluid compressibility. The reliability of this coupling method is preliminarily verified by the particle sedimentation test. Additionally, undrained triaxial shear and one‐dimensional consolidation tests are conducted to examine the applicability of the proposed method in simulating geotechnical cases. From our analysis, it is found that the shear responses in the undrained triaxial shear test obtained from the proposed method with dynamic mesh are in direct accordance with those led by the constant volume (CV) method. However, difficulties arise in accurately describing the moving boundary by the fixed mesh, leading to unreliable results. Moreover, in the one‐dimensional consolidation test, both the dynamic and fixed grids can capture the Mandel—Cryer effect, which is more pronounced under the dynamic grid, mainly due to the dual impact of the loading device and particle skeleton on the fluid. A greater compressibility specified under the dynamic grid led to a weakening of this effect, whereas its duration is increased. Our work provides valuable insights for effectively dealing with dynamic fluid boundaries.

show abstract

Micromechanical analysis of capillary suction effect on bearing capacity of unsaturated fine granular foundation soil using coupled CFD-DEM method

Cited by 20 publications

References 76 publications

Micro computed tomography images of capillary actions in rough and irregular granular materials

Micro computed tomography images of capillary actions in rough and irregular granular materials

Effect of particle shape and bedding angle on suffusion in gap‐graded granular soils by coupled CFD‐DEM method

A novel unresolved/semi‐resolved CFD‐DEM coupling method with dynamic unstructured mesh

Contact Info

Product

Resources

About