Modeling of internal erosion using particle size as an extra dimension

Bi, Jinfeng; Zhang, Haitao; Luo, Xianqi; Shen, Hui; Li, Zhuomin

doi:10.1016/j.compgeo.2021.104021

Cited by 13 publications

(4 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There are then several solutions to take into account the presence of viscous effects: (1) Do not solve this region and use a wall law instead, (2) Introduce damping functions forcing the behavior of the model, henceforth called low-Reynolds model, or (3) Solve different equations for the main flow and the near-wall flow. The standard k-ε or RNG models are based on approach (1) [13][14][15][16].…”

Section: Modelling Approach Of the Interface Erosionmentioning

confidence: 99%

Numerical Modeling of Soil Erosion with Three Wall Laws at the Soil-Water Interface

et al. 2021

View full text Add to dashboard Cite

In the area of civil engineering and especially hydraulic structures, we find multiple anomalies that weakens mechanical characteristics of dikes, one of the most common anomalies is erosion phenomenon specifically pipe flow erosion which causes major damage to dam structures. This phenomenon is caused by a hole which is the result of the high pressure of water that facilitate the soil migration between the two sides of the dam. It becomes only a question of time until the diameter of the hole expands and causes destruction of the dam structure. This problem pushed physicist to perform many tests to quantify erosion kinetics, one of the most used tests to have logical and trusted results is the HET (hole erosion test). Meanwhile there is not much research regarding the models that govern these types of tests. Objectives: In this paper we modeled the HET using modeling software based on the Navier Stokes equations, this model tackles also the singularity of the interface structure/water using wall laws for a flow turbulence. Methods/Analysis: The studied soil in this paper is a clay soil, clay soil has the property of containing water more than most other soils. Three wall laws were applied on the soil / water interface to calculate the erosion rate in order to avoid the rupture of such a structure. The modlisitation was made on the ANSYS software. Findings: In this work, two-dimensional modeling was carried of the soil.in contrast of the early models which is one-dimensional model, the first one had shown that the wall-shear stress which is not uniform along the whole wall. Then using the linear erosion law to predict the non-uniform erosion along the whole length. The previous study found that the wall laws have a significant impact on the wall-shear stress, which affects the erosion interface in the fluid/soil, particularly at the hole's extremes. Our experiment revealed that the degraded profile is not uniform. Doi: 10.28991/cej-2021-03091742 Full Text: PDF

show abstract

Section: Modelling Approach Of the Interface Erosionmentioning

confidence: 99%

Numerical Modeling of Soil Erosion with Three Wall Laws at the Soil-Water Interface

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Jiang [5] investigated the fine particle migration in the dam and the slope failure mode and proposed a coupled model of the fine particle migration equations, the unsaturated seepage equations, and the equations for local stability analysis. Bi [13] proposed a method to characterize the variation in soil gradation during internal erosion. This method utilized fundamental dimensional equations to describe the migration of macroscopic fine particles and additional dimensional equations to control the variation in soil gradation.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Rainfall-Induced Erosion on Infiltration and Slope Stability

Cheng,

Hou,

Sun

et al. 2024

Water

View full text Add to dashboard Cite

In slopes where a mixture of coarse and fine particles is present, the infiltration of rainfall can cause the migration of fine particles. This migration alters the hydraulic properties of the soil and has implications for slope stability. In this study, the slope under investigation is a tailings dam composed of loosely consolidated soil with a wide particle size distribution. Due to rainfall infiltration, fine particles tend to migrate within the voids of the coarse particle framework, leading to changes in hydraulic properties and inducing slope instability. The classical internal erosion constitutive model, known as the Cividini and Gioda erosion criterion, is commonly used to predict the behavior and effects of fine particle erosion in geotechnical engineering. However, certain parameters in this erosion criterion equation, such as long-term density, are challenging to obtain through experiments. To investigate the coupled evolution of seepage and erosion within landfill slopes under the influence of rainfall infiltration and to understand the mechanisms of slope instability, this research assumes the erosion of fine particle suspension and adopts the Worman and Olafsdottir erosion criterion to establish a coupled model of unsaturated seepage and internal erosion. The developed model simulates the coupled response of seepage and erosion in unsaturated landfill slopes under three different rainfall intensities. It is then combined with the infinite slope model to quantitatively analyze the impact of fine particle migration on soil permeability and slope stability. The numerical simulations provide the following findings: The Worman and Olafsdottir erosion criterion, unlike the Cividini and Gioda erosion criterion, only requires the determination of the soil’s gradation curve to estimate the erosion rate. Internal erosion primarily occurs within the leading edge of moisture penetration, accelerating the advancement of the wetting front and reducing slope stability. When the rainfall intensity is lower than the saturated permeability coefficient, the influence of internal erosion can be disregarded. However, under rainfall intensities equal to or greater than the saturated permeability coefficient, considering internal erosion results in a difference in the depth of the wetting front of up to 34.2 cm after 6 h in the R2 scenario. The safety factor without considering internal erosion is 1.12, whereas considering internal erosion yields safety factors between 1.08 and 1.09. In the R3 scenario, the difference in the depth of the wetting front reaches 53.8 cm after 6 h, with a safety factor of 1.12 without considering internal erosion and safety factors between 1.06 and 1.07 when considering internal erosion.

show abstract

“…Porous soil is one of the most commonly used filling materials in hydraulic engineering and geotechnical foundation works. The physical structure of porous soil presents irregular, discontinuous, and nonhomogeneous characteristics, which derive from the randomness of particle size distributions and pore networks [1][2][3]. For this reason, porous soil is more likely to trigger seepage erosion due to the loss of soil integrity caused by seepage flows, which may bring the risk of potential disaster, such as sinkholes in roads, the collapse of foundation pits, and the breaching of dams [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

“…Investigations have shown that seepage-induced erosion of porous soil in the foundation is the most likely reason for the initial chute slab failure under high-pressure flow conditions [44,45]. 2 Geofluids…”

Section: Introductionmentioning

confidence: 99%

Fractal Characteristics of the Seepage Erosion Process in Porous Soil

Wang

Duan

et al. 2022

Geofluids

View full text Add to dashboard Cite

Seepage-induced erosion in porous soil has always been a major concern in the field of geofluids. Various fractal models have been built to theoretically investigate the porosity and permeability coefficient. However, the seepage erosion process (i.e., incubation, formation, evolution, and destruction) in porous soil is not clearly demonstrated to clarify the seepage fractal characteristics. In this paper, a series of hydraulic tests were performed to reveal the mass fractal characteristics of sandy gravels, coarse-grained sands, and fine-grained sands in the seepage erosion process. The results show that the mass fractal dimension was appropriate to describe the cumulative mass distribution of particles, the complexity of pore networks, and the dynamic changes of the seepage erosion process. Moreover, the scale-invariant interval, as an essential precondition for the accurate calculation of the mass fractal dimension, was to some extent affected by the average grain size and the fine content of porous soil. In particular, the changing trend of porosity and permeability coefficient with the mass fractal dimension was demonstrated in the seepage erosion process. Both porosity and permeability coefficients indicated an increasing trend as the development of seepage erosion. However, the mass fractal dimension gradually decreased due to the removal of fine particles induced by seepage flow water. Research findings will not only provide a new perspective on the seepage erosion mechanism but also predict the development of the seepage erosion process in engineering practice.

show abstract

Modeling of internal erosion using particle size as an extra dimension

Cited by 13 publications

References 43 publications

Numerical Modeling of Soil Erosion with Three Wall Laws at the Soil-Water Interface

Numerical Modeling of Soil Erosion with Three Wall Laws at the Soil-Water Interface

Numerical Simulation of Rainfall-Induced Erosion on Infiltration and Slope Stability

Fractal Characteristics of the Seepage Erosion Process in Porous Soil

Contact Info

Product

Resources

About