Modeling coupled erosion and filtration of fine particles in granular media

Yang, Jie; Yin, Zhen‐Yu; Laouafa, Farid; Hicher, Pierre Yves

doi:10.1007/s11440-019-00808-8

Cited by 86 publications

(22 citation statements)

References 54 publications

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“…Additionally, numerical simulations [e.g. 16,17] and micro-scale images [e.g. 18,19] were also used to study the internal instability.…”

Section: Introductionmentioning

confidence: 99%

Investigation of gap-graded soils’ seepage internal stability with the concept of void filling ratio

Zhang¹,

Zhang²,

Li³

2020

PLoS ONE

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Gap-graded soils from mountain areas are often used as subgrade filling materials, but problems associated with the gap-graded soils such as large permeability, poor uniformity, and poor seepage stability have to be solved. This article proposes a new terminology "void filling ratio" to study the seepage internal stability of gap-graded soils as subgrade filling materials. Laboratory seepage tests were performed to investigate the effects of compaction degrees of coarse grains, void filling ratios, and clay contents on the internal stability. Laboratory model tests were also performed to verify the findings from the laboratory seepage tests. It was found that the internal stability increased with increase of the void filling ratios, confirmed by both laboratory seepage tests and slope model tests. The increases of both void filling ratio and the clay content were able to change the type of internal instability from piping to the transitional type of internal instability. In laboratory model tests, surface areas lost more fine particles than the deeper area did in the models, but when the void filling ratio was increased, the amount of lost fine particles was significantly reduced. Finally, it was confirmed that void filling ratio was able to effectively describe the internal stability of gap-graded soils subject to different levels of hydraulic gradient.

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“…Additionally, numerical simulations [e.g. 16,17] and micro-scale images [e.g. 18,19] were also used to study the internal instability.…”

Section: Introductionmentioning

confidence: 99%

Investigation of gap-graded soils’ seepage internal stability with the concept of void filling ratio

Zhang¹,

Zhang²,

Li³

2020

PLoS ONE

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“…A finite difference code was developed to investigate the validity of the proposed model . The comparison between experimental results and simulations demonstrated that, with an appropriate erosion law and well‐calibrated model parameters, the numerical model was able to reproduce with success the initiation and development of internal erosion.…”

Section: Coupled Hydromechanical Modelmentioning

confidence: 99%

Three‐dimensional hydromechanical modeling of internal erosion in dike‐on‐foundation

Yang

Yin

Laouafa

et al. 2020

Num Anal Meth Geomechanics

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Currently, numerical studies at the real scale of an entire engineering structure considering internal erosion are still rare. This paper presents a threedimensional (3D) numerical simulation of the effects of internal erosion within a linear dike located on a foundation. A two-dimensional (2D) finite element code has been extended to 3D in order to analyze the impact of internal erosion under more realistic hydromechanical conditions. The saturated soil has been considered as a mixture of four interacting constituents: soil skeleton, erodible fines, fluidized fine particles, and fluid. The detachment and transport of the fine particles have been modeled with a mass exchange model between the solid and the fluid phases. An elastoplastic constitutive model for sand-silt mixtures has been developed to monitor the effect of the evolution of both the porosity and the fines content induced by internal erosion upon the behavior of the soil skeleton. An unsaturated flow condition has been implemented into this coupled hydromechanical model to describe more accurately the seepage within the dike and the foundation. A stabilized finite element method was used to eliminate spurious numerical oscillations in solving the convectiondominated transport of fluidized particles. This numerical tool was then applied to a specific dike-on-foundation case subjected to internal erosion induced by a leakage located at the bottom of the foundation. Different failure modes were observed and analyzed for different boundary conditions, including the significant influence of the leakage cavity size and the elevation of the water level at the upstream and downstream sides of the dike. K E Y W O R D Scritical state, dike, fines content, granular media, internal erosion, stabilized finite element method

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“…For examples, Üzüm et al (2009) synthesized and characterized Kaolin-supported nZVI (K-nZVI) [33], while Zhang et al (2010) demonstrated the removal of Pb(II) from water using K-nZVI [34], However, the effect of kaolin particle size on the pollutant removal performance has not been well studied in the literature. The present authors believe that as the particle size of kaolin decreases, the specific surface area, the number of pores, and the pore volume will increase [35,36]. The resulting increase in adsorption capacity will allow more nZVI to be loaded on the surface of kaolin, which should improve the removal efficiency for Pb(II) in water.…”

Section: Introductionmentioning

confidence: 76%

Effect of Kaolin particle size on the removal of Pb(II) from aqueous solutions by Kaolin-supported nanoscale zero-valent iron

Chen

et al. 2020

Mater. Res. Express

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The removal of Pb(II) from aqueous solutions was investigated using kaolin with two different particle sizes (2.3 and 45 μm) with and without nanoscale zero-valent iron (nZVI, at a Fe content close to 30%). The experimental results show that 2.3 μm kaolin loaded with nZVI (K-nZVI) had the best Pb(II) removal performance under various test conditions. After 24 h, it removed 99.5% of Pb(II) ions in the solution, followed by 45 μm K-nZVI, 2.3 μm kaolin, and 45 μm kaolin (89.01%, 68.8%, and 65.8%, respectively). The removal rates by all four kaolin samples increased with increasing pH in the range of 2-6, and with increasing temperature between 30°C-60°C. The results show that using finer carrier particles improves the performance of K-nZVI for removing Pb(II) in aqueous solutions.

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Modeling coupled erosion and filtration of fine particles in granular media

Cited by 86 publications

References 54 publications

Investigation of gap-graded soils’ seepage internal stability with the concept of void filling ratio

Investigation of gap-graded soils’ seepage internal stability with the concept of void filling ratio

Three‐dimensional hydromechanical modeling of internal erosion in dike‐on‐foundation

Effect of Kaolin particle size on the removal of Pb(II) from aqueous solutions by Kaolin-supported nanoscale zero-valent iron

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