Improved Filter Criterion for Cohesionless Soils

Honjo, Yusuke; Veneziano, Daniele

doi:10.1061/(asce)0733-9410(1989)115:1(75)

Cited by 56 publications

(16 citation statements)

References 8 publications

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“…To quantify the gradational threshold between these processes geotechnical filter theory proved to be useful. Geotechnical filter criteria predict framework clogging by comparing the d 15 of the filter to the d 85 of the base material percolating into it (Terzaghi & Peck, 1967; Honjo & Veneziano, 1989; Sherard et al. , 1989; Brauns, 1991; Witt, 1993).…”

Section: Resultsmentioning

confidence: 99%

Vertical gradational variability of fines deposited in a gravel framework

Gibson¹,

Abraham²,

Heath³

et al. 2009

Sedimentology

120

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Vertical gradational structures develop as sand infiltrates into static gravel beds. Understanding the vertical distribution of interstitial sand deposits will improve predictions of ecological suitability and hyporheic hydrodynamics. A series of flume experiments was performed to investigate fine infiltration processes. Four sand distributions were introduced into flows over gravel beds. After each experiment, bed cores were extracted and analysed in vertical layers to examine the gradational trends with depth. Vertical trends of fine content were highly sensitive to the relative grain-size distributions of the gravel bed and the introduced sand. For experiments with d 15gravel /d 85sand ratios 15AE4 and larger unimpeded static percolation was observed, where sand filled the voids relatively uniformly from the bottom of the gravel layer to the top. Experiments with ratios 10AE6 and smaller bridged. Sand clogged a thin layer of gravel pores near the bed surface, precluding subsequent infiltration. Interstitial sand deposits fined with depth of penetration for all experiments which was the result of three distinct but overlapping processes. (i) Granular sorting: As particles fell through the substrate, smaller material preferentially passed through the voids deeper into the gravel. (ii) Bed-load sorting: Size segregation occurs in the wake of the leading bed form as smaller particles saltate further and settle first. (iii) Hydraulic sorting: Smaller sand was transported preferentially as suspended load filling the deep voids of the furthest flume positions downstream. Finally, when the experiments that formed a bridge layer were replicated with higher bed shear stresses, less interstitial sand deposition was observed. Higher shear stresses transported coarse particles downstream more efficiently causing bridge layers to form earlier and allowing less time for suspended load to settle into the deeper substrate pores before the pathways were closed.

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Section: Resultsmentioning

confidence: 99%

Vertical gradational variability of fines deposited in a gravel framework

Gibson¹,

Abraham²,

Heath³

et al. 2009

Sedimentology

120

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“…As previously discussed, the grain size ratio is used to represent the soil and filter materials. Honjo and Veneziano (1989)…”

Section: Effect Of Grain Size Ratiomentioning

confidence: 99%

“…There are several other factors which can promote piping erosion. One of the reasons the grain size ratio Di5f/D 85s is used rather than Di 0 of/D 0s is the formation of a filtration zone (Honjo andVeneziano, 1989, Okita andNishigaki, 1993). As soil migrates into the filter, the coarser fraction of the soil gets lodged in the pore spaces and the smaller fraction forms bridges.…”

Section: Chapter 1 Introductionmentioning

confidence: 99%

Seepage forces and confining pressure effects on piping erosion

Tomlinson¹,

Vaid²

2000

Revue canadienne de géotechnique

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In presenting this thesis in partial fulfilment of the requirements for an advanced degree at the University of British Columbia, I agree that the Library shall make it freely available for reference and study. I further agree that permission for extensive copying of this thesis for scholarly purposes may be granted by the head of my department or by his or her representatives. It is understood that copying or publication of this thesis for financial gain shall not be allowed without my written permission.

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“…Since their first inception in the early 1920s by Terzaghi (Fannin 2008), filter and filtration problems have been investigated by numerous researchers using empirical and analytical methods. Examples of works using empirical methods are those of Vaughan and Soares (1982), Sherard et al (1984a, b), Sherard and Dunnigan (1989), Lafleur et al (1989), Honjo and Veneziano (1989), . Analytical models have been developed using probabilistic theories to determine the nature of the pore network or constriction sizes of filter media (Silveira et al 1975;Kenney et al 1985;Wittmann 1979;Witt 1993;Schuler 1996;Humes 1996;Indraratna et al 2007;Raut and Indraratna 2008).…”

Section: Introductionmentioning

confidence: 99%

Analytical Solutions for Filtration Process Based on the Constriction Size Concept

Indraratna

Rujikiatkamjorn

Nguyen

et al. 2014

Geo-Congress 2014 Technical Papers

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An analytical model is proposed to describe the filtration process applicable to a base soil-filter system. The Navier-Stokes equations for porous media are used to capture the hydrodynamic behavior, whereas, numerically, a new algorithm is proposed to solve the Navier-Stokes equation in a nonlinear form. The various mixtures of base soil particles eroded and water flow within the system are computed using the workenergy principle incorporating the constriction size of the filter.The model can assess the filtration process through the flowrate and the accumulation and redistribution of fine particles within the filter. By discretizing the base soil and filter domains into discrete elements, the model can predict the time-dependent particle gradation of the filter for each element. Laboratory tests reported in other studies and those conducted by the authors validate the model in relation to other available models. Abstract: An analytical model is proposed to describe the filtration process applicable to a base soil-filter system. The Navier-Stokes equations for porous media are used to capture the hydrodynamic behavior, whereas, numerically, a new algorithm is proposed to solve the Navier-Stokes equation in a nonlinear form. The various mixtures of base soil particles eroded and water flow within the system are computed using the workenergy principle incorporating the constriction size of the filter. The model can assess the filtration process through the flow rate and the accumulation and redistribution of fine particles within the filter. By discretizing the base soil and filter domains into discrete elements, the model can predict the time-dependent particle gradation of the filter for each element. Laboratory tests reported in other studies and those conducted by the authors validate the model in relation to other available models.

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Improved Filter Criterion for Cohesionless Soils

Cited by 56 publications

References 8 publications

Vertical gradational variability of fines deposited in a gravel framework

Vertical gradational variability of fines deposited in a gravel framework

Seepage forces and confining pressure effects on piping erosion

Analytical Solutions for Filtration Process Based on the Constriction Size Concept

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