Numerical Analysis of the Erosion and the Transport of Fine Particles within Soils Leading to the Piping Phenomenon

Fujisawa, Kazunori; Murakami, Akira; Nishimura, Shin Ichi

doi:10.3208/sandf.50.471

Cited by 66 publications

(28 citation statements)

References 20 publications

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“…However, even though the discrete methods can represent fairly well the microstructure and describe better and better the physical mechanisms within granular materials, they are still restricted to problems with a too small number of particles; therefore, they do not provide a sufficiently accurate representation of the problems at the scale of the geotechnical structure. Another method which has been inspired by the porous continuum medium theory uses averaged variables at the scale of a representative elementary volume (REV) . Most of these studies describe the detachment and transport of finer soil particles within the solid matrix induced by internal erosion.…”

Section: Introductionmentioning

confidence: 99%

Internal erosion in dike‐on‐foundation modeled by a coupled hydromechanical approach

Yang

Yin

Laouafa

et al. 2018

Num Anal Meth Geomechanics

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Summary One of the major causes of instability in geotechnical structures such as dikes or earth dams is internal erosion, an insidious process that occurs over a long period of time. Research on this topic is still fairly new and much more needs to be understood in order to solve the problems posed by this phenomenon. This paper proposes a hydromechanical model based on porous continuous medium theory to assess how internal erosion impacts the safety of earthen structures. The saturated soil is 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 are described by 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 porosity and fines content induced by internal erosion upon the behavior of the soil skeleton. The model has been numerically solved with the finite element method. It has then been applied to the specific case study of a dike foundation subjected to internal erosion induced by the presence of a karstic cavity beneath the alluvium layer. The numerical results show the onset of erosion, the time‐space evolution of the eroded zone, and the hydromechanical response of the soil constituting the dike, all of which highlights the effects of the cavity location, the erosion rate, and the fines content.

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Section: Introductionmentioning

confidence: 99%

Internal erosion in dike‐on‐foundation modeled by a coupled hydromechanical approach

Yang

Yin

Laouafa

et al. 2018

Num Anal Meth Geomechanics

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“…FVM realizes a low computational load and is advantageous in that it can stably solve diŠerential equations with advective terms. As for computational studies on geotechnical problems, Nishigaki et al (1986) applied FVM to a saturated-unsaturated seepage analysis, although they described the method as an`Integrated Finite DiŠerence Method (IFDM)', and Fujisawa et al (2010) have used the method to solve the advection equation of eroded soil particles migrating within soils. Rapid advancements are being made with FVM and its potential for use in geotechnical applications is expected to be soon realized.…”

Section: Mesh-free Methods Sph Finite Volume Methods and So Onmentioning

confidence: 99%

Numerical Methods

Murakami¹,

Wakai²,

Fujisawa³

2010

Soils and Foundations

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This paper provides a comprehensive survey of the numerical methods related to geotechnical problems, most of which were reported in papers appearing in Soils and Foundations. The reason why most of the reviewed papers are concentrated in Soils and Foundations is that if we were to include papers appearing in other journals in theˆeld of geotechnical engineering, closely related to numerical methods, e.g., Computers and Geotechnics, Int. J. Numer. Anal. Meth. Geomech., etc., we would have to deal with almost all the papers in those journals. Firstly, we present a description of the current status of the numerical methods, and then give a brief review of the literature covering several topics in geotechnical applications. The scope of the review is limited, and thus, the authors do not profess to cover the entire range of literature.

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“…It has been well known that internal erosion leads to an increased hydraulic conductivity and induces a reduction of soil strength [2]. In addition, the transport of fine particles in soil matrix results in piping phenomenon or in collapse of soil structures [3]- [5].…”

Section: Introductionmentioning

confidence: 99%

Internal Erosion of Volcanic Coarse Grained Soils and Its Evaluation

Hieu¹

2017

GEOMATE

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This paper aims at revealing mechanical behavior of volcanic coarse grained soils subjected to seepage flow. In order to accomplish the purposes, a series of upward seepage tests was conducted to grasp piping phenomenon in compacted volcanic soils and to investigate the effects of differences in compaction conditions on its behavior. In the experiments, the movement of soil particles in seepage flow tests was observed using an X-ray CT scanner in detail. The test results showed that destabilization of soil structures due to seepage flow is changed depending on an increase of amount of finer soil particles, and that internal erosion is induced by loss of fine particles with the changes in void ratio. As a result, a significant variation in hydraulic conductivity was generated. Additionally, internal stability of volcanic soils under several geotechnical conditions was elucidated by empirical criterion. In the consideration of the results, it was shown that volcanic coarse grained soil including pumice particles with a low specific gravity was internally unstable. Based on the results, a geotechnical evaluation was discussed for the stability of soil structures such as embankments constructed by volcanic coarse grained soils.

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Numerical Analysis of the Erosion and the Transport of Fine Particles within Soils Leading to the Piping Phenomenon

Cited by 66 publications

References 20 publications

Internal erosion in dike‐on‐foundation modeled by a coupled hydromechanical approach

Internal erosion in dike‐on‐foundation modeled by a coupled hydromechanical approach

Numerical Methods

Internal Erosion of Volcanic Coarse Grained Soils and Its Evaluation

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