Experimental study on the effect of fine contents on internal erosion in natural soil deposits

Tian, Da-Lang; Xie, Qiang; Fu, Xiang; Zhang, Jianhua

doi:10.1007/s10064-020-01829-4

Cited by 27 publications

(9 citation statements)

References 38 publications

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“…The median grain sizes d50 of fines-dominated debris were 0.05-0.07 mm, which were smaller than the values for the balanced-composition debris (0.87-8.82 mm) and coarse-dominated debris (8.77-13.26 mm) (Table 1). The particles with sizes below 0.075 mm were deemed to be fine particles, and the particles larger than 0.25 mm were deemed to be coarse particles (Tian et al, 2020).…”

Section: Experimental Materialsmentioning

confidence: 99%

Effects of grain composition on the stability, breach process, and breach parameters of landslide dams

et al. 2022

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Section: Experimental Materialsmentioning

confidence: 99%

Effects of grain composition on the stability, breach process, and breach parameters of landslide dams

et al. 2022

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“…Soil–rock mixtures are granular materials that can be constituted in many different ways, with different types of interparticle contacts. A host of variables play significant roles in the internal credibility of soil–rock mixtures, including the fines content (FC), particle size distributions (PSDs), hydraulic gradient, the constituent materials, and stress state (Kenney & Lau, 1985; Kezdi, 1979; Slangen & Fannin, 2017; Thevanayagam et al, 2002; Tian et al, 2020). The influence of FC is particularly prominent for gap‐graded soil–rock mixtures; it has a significant effects on the mixtures' erosion resistance, representing the effect of soil packing, the stress transfer of the mixture, and the uniformity of particle size distribution (Thevanayagam et al, 2002; Vallejo, 2001).…”

Section: Introductionmentioning

confidence: 99%

“…Ouyang and Takahashi (2015) presented experimental investigations on the influence of the initial FC on the fabric of soils subjected to internal erosion. Tian et al (2020) studied the critical FC of naturally accumulating soil, beyond which the internal stability of the mix was distinctly altered. In the above studies, the researchers realized the importance of the FC and found the specific effect of critical FC on internal erosion.…”

mentioning

confidence: 99%

Fluid–solid coupled model for the internal erosion of gap‐graded soil–rock mixtures with different fines contents: Its verification and application

Cao

Sun

Xie

et al. 2022

Hydrological Processes

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Soil-rock mixtures are widely encountered in geotechnical engineering projects.Gap-graded soil-rock mixtures are prone to internal erosion because the fine particles are easily removed by seepage flow within the large pores between the coarse particles. Internal erosion has been the focus of geological disaster research. As concluded from different studies, the fines content (FC) of gap-graded soils is a crucial factor in controlling soil stability. For this reason, a fluid-solid coupled model with the computational fluid dynamics-the discrete element method, with an indoor physical permeability test, was conducted to study the evolution characteristics of internal erosion of gap-graded soil-rock mixtures of different FCs. After the erosion test, the vertical section of the sample was divided into three areas according to changes in fine particles: top, middle uniform, and bottom loss areas. The study showed that a large number of particles in the bottom loss areas are lost at first and the top loss area will enter the middle uniform loss areas. The fine particles in the middle are affected by the fine particle content, from accumulation to equilibrium to loss. Fine particle loss occurred at different sample heights. The top particle loss is the most serious, followed by the bottom and then the middle, and this is consistent with the changes, from a particle-size perspective. An FC of 35% may be the critical value of the coarse-fine particle skeleton structure in the preset working conditions of coarse and fine particle diameters. There are apparent 'island' effects in the sample where FC = 40%. This can be analysed through strong force chain analysis, from the particle-size perspective that 'island' effects continue to disappear under the influence of internal erosion.

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“…Under the action of rainfall infiltration, landslides, collapses, and other geological disasters can easily occur due to the migration of fine particles in gap-graded soil-rock mixtures (Grosta et al, 1999;Zhang et al, 2011;Johan et al, 2013;Lei et al, 2017;Fan et al, 2020). Therefore, the study of seepage-induced fine particle migration through gap-graded soils is crucial (Cheng et al, 2018;Tian et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

“…Lopez et al (2016) proposed a case study of a soil structure based on previous empirical observations, which conceptually explained the effects of different components (coarse and fine particles) on the mixture behaviour. Tian et al (2020) studied the critical FC of natural accumulation soil, beyond which the internal stability of the mix was distinctly altered. Based on the fact that fine particles in soils gradually migrate downwards and lead to subsequent slope failure during rainfall events, Yin et al (2021) developed a 3D discrete solid-fluid sequentially coupled model to analyse changes in pore structure caused by fine particle migration.…”

Section: Introductionmentioning

confidence: 99%

Study on Particle-Size Process on Internal Erosion of Grap-Graded Soil--Rock Mixtures of Different Fine Contents

Cao

Sun

Xie

et al. 2021

Preprint

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Soil–rock mixtures are widely encountered in geotechnical engineering projects. The instability and failure mechanism of grap-graded soil–rock mixtures under rainfall conditions has always been the focus of geological disaster research. To deeply explore the mechanism of seepage deformation of soil–rock mixtures, an indoor physical permeability test that considers soil–rock mixtures with different fine contents was conducted, and a particle-scale numerical simulation test of the permeability evolution was carried out using the coupling model of PFC3D and ABAQUS. The test results showed that the spatial distribution of fine particle loss along the height direction could be divided into three areas: top loss, middle uniform, and bottom loss area. The “island” effect of coarse particles, which is caused by excessive fine content and makes the fine particles bear more load, was eliminated with the loss of fine particles. In this preset working condition of coarse and fine particle diameters, setting FC to 35% may be the best way to fill the voids between the coarse particles. Particle migration leads to a change in the load-bearing skeleton structure, thereby causing seepage deformation. Therefore, the particle-scale numerical test method can better reproduce the seepage deformation process of grap-graded soil–rock mixtures.

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Experimental study on the effect of fine contents on internal erosion in natural soil deposits

Cited by 27 publications

References 38 publications

Effects of grain composition on the stability, breach process, and breach parameters of landslide dams

Effects of grain composition on the stability, breach process, and breach parameters of landslide dams

Fluid–solid coupled model for the internal erosion of gap‐graded soil–rock mixtures with different fines contents: Its verification and application

Study on Particle-Size Process on Internal Erosion of Grap-Graded Soil--Rock Mixtures of Different Fine Contents

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