Experimental Parametric Study of Suffusion and Backward Erosion

Bendahmane, Fateh; Marot, Didier; Alexis, Alain

doi:10.1061/(asce)1090-0241(2008)134:1(57)

Cited by 250 publications

(143 citation statements)

References 13 publications

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“…Thus the angularity also has an effect on hydraulic conductivity decrease. In conformity with previous conclusions [Reddi, 2000;Bendahmane, 2008;Marot, 2009Marot, , 2011 this decrease in hydraulic conductivity is attributed to particle filtration which may induce a clogging process.…”

Section: Iv3 Influence Of Grain Size Distribution and Coarse Fractiosupporting

confidence: 92%

“…The device consists of a triaxial cell coupled to a hydraulic system designed to generate seepage flow through the specimen in downward direction in hydraulic-gradient-controlled conditions. A complete description of the device is given by [Bendahmane, 2008]. The quantity of eroded particles can be very small.…”

Section: Ii1mentioning

confidence: 99%

“…The first process consists in a regressive pulling up of the particles from the downstream of the soil to an external middle with an upward development [Lafleur, 1999;Bendahmane, 2008;Marot, 2009]. The suffusion phenomena concerns only the fine particles and results in a diffuse redistribution of particles within the soil.…”

Section: Introductionmentioning

confidence: 99%

“…The suffusion phenomena concerns only the fine particles and results in a diffuse redistribution of particles within the soil. The global grain size distribution of the soil changes slightly but the hydraulic conductivity can evolve notably [Lafleur, 1999;Bendahmane, 2008;Marot, 2009].…”

Section: Introductionmentioning

confidence: 99%

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Influence of angularity of coarse fraction grains on internal erosion process

2012

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Section: Iv3 Influence Of Grain Size Distribution and Coarse Fractiosupporting

confidence: 92%

Section: Ii1mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of angularity of coarse fraction grains on internal erosion process

2012

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“…Creation of suffosion holes is a phenomenon specially typical and onerous for water supply systems of a high intensity rate placed in internally unstable soils. The result of a breakage of a buried water pipe is the water movement in soil, which can cause that fine soil particles are washed out from the solid matrix and transported through pores (suffosion process) [16,17,18,19,20,21]. As a result, depressions or holes can form on the soil surface.…”

mentioning

confidence: 99%

Suffosion Holes as the Results of a Breakage of a Buried Water Pipe

Iwanek

Suchorab

Karpińska-Kiełbasa³

2017

Period. Polytech. Civil Eng.

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The result of a breakage of a buried water pipe is the water movement in soil, which can cause that fine soil particles are washed out from the solid matrix and transported through pores (suffosion process IntroductionDepressions or holes creating on the soil surface as a result of suffosion can be very dangerous, especially in urban areas. It is widely known that the most hazardous phenomena of this kind relate to water-engineering structures [1,2,3]. It stems from the fact that failures and damages of pipes occur in water, sewage and storm water systems all over the world during their operation [4,5,6]. Even the high-tech methods of pipes condition assessment do not enable to prevent leakages occurrence, because of their random character and multiplicity of their reasons [7,8,9]. Still insufficient knowledge about them [10] is caused by many different, both static (pipe and soil parameters) and dynamic (hydraulic working conditions), factors [11,12,13,14,15]. Creation of suffosion holes is a phenomenon specially typical and onerous for water supply systems of a high intensity rate placed in internally unstable soils. The result of a breakage of a buried water pipe is the water movement in soil, which can cause that fine soil particles are washed out from the solid matrix and transported through pores (suffosion process) [16,17,18,19,20,21]. As a result, depressions or holes can form on the soil surface. Holes creating on the soil surface by water outflowing after a failure of a buried pipeline (suffosion holes), are in different shapes and sizes.Recognition of factors influencing holes shapes and sizes would facilitate the prevention of hazardous suffosion effects connected with failures of water distribution systems. In the range of the presented article, the influence of pressure head in a water pipe on dimensions of suffosion holes was analysed. The basis of the analysis was results of laboratory investigations of the controlled leakage from a buried water pipe.

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Numerical simulation of backward erosion piping in heterogeneous fields

Liang

Yeh

Wang

et al. 2017

Water Resources Research

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Backward erosion piping (BEP) is one of the major causes of seepage failures in levees. Seepage fields dictate the BEP behaviors and are influenced by the heterogeneity of soil properties. To investigate the effects of the heterogeneity on the seepage failures, we develop a numerical algorithm and conduct simulations to study BEP progressions in geologic media with spatially stochastic parameters. Specifically, the void ratio e, the hydraulic conductivity k, and the ratio of the particle contents r of the media are represented as the stochastic variables. They are characterized by means and variances, the spatial correlation structures, and the cross correlation between variables. Results of the simulations reveal that the heterogeneity accelerates the development of preferential flow paths, which profoundly increase the likelihood of seepage failures. To account for unknown heterogeneity, we define the probability of the seepage instability (PI) to evaluate the failure potential of a given site. Using Monte‐Carlo simulation (MCS), we demonstrate that the PI value is significantly influenced by the mean and the variance of ln k and its spatial correlation scales. But the other parameters, such as means and variances of e and r, and their cross correlation, have minor impacts. Based on PI analyses, we introduce a risk rating system to classify the field into different regions according to risk levels. This rating system is useful for seepage failures prevention and assists decision making when BEP occurs.

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Experimental Parametric Study of Suffusion and Backward Erosion

Cited by 250 publications

References 13 publications

Influence of angularity of coarse fraction grains on internal erosion process

Influence of angularity of coarse fraction grains on internal erosion process

Suffosion Holes as the Results of a Breakage of a Buried Water Pipe

Numerical simulation of backward erosion piping in heterogeneous fields

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