Prediction of pore size characteristics of woven slit-film geotextiles subjected to tensile strains

Tang, Xiaowu; Lin, Tong; She, Wei; Gao, Bai-Song

doi:10.1016/j.geotexmem.2013.05.001

Cited by 18 publications

(11 citation statements)

References 18 publications

(23 reference statements)

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“…Index properties of industrial PVD are summarized in Table 3. According to the manufacturing process [26], the PVD membrane can presently be divided into the non-woven fabric and woven fabric. The former is obtained by the fusion of fiber molecules in random directions; while, the latter turns the fiber into yarn and interweaves in the orthogonal direction.…”

Section: Modeling On Pvd Membranementioning

confidence: 99%

Numerical Investigating on Representativeness of Tracers in PIV Model Test of Dredged Slurry Treated by Vacuum Preloading

Wang

et al. 2021

Applied Sciences

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The vacuum preloading method is commonly adopted for improving the soft ground that the embankment of the railway line is laid on. The PIV (Particle Image Velocimetry) technique is a powerful tool in observing the formation of the soil column, a phenomenon that is unique to the dredged slurry when treated by vacuum preloading. However, it is not clear to what extent the motions of the slurry particles can be represented by the PIV tracers. In this paper, a mesoscopic model has been established by using the CFD-DEM method to reproduce the vacuum consolidation process of the slurry, in which the PVD (Prefabricated Vertical Drain) membrane, the slurry particles, and the tracers are described by the DEM, and the pore water is governed by the CFD method. Eight computational cases that can cover a broad range of material parameters governing the PIV model tests on the dredged slurry have been designed and studied by the established model. The representativeness of the PIV tracer is evaluated by comparing the statistic displacement of the tracer to that of the slurry particles. It is found that for the commonly used tracer, the carbon powder, can reliably represent the particle motions of the slurry since the difference in displacements of the tracer and the slurry particles is smaller than 6.5% if the diameter ratio between the tracer and the slurry particle is within 1.8.

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Section: Modeling On Pvd Membranementioning

confidence: 99%

Numerical Investigating on Representativeness of Tracers in PIV Model Test of Dredged Slurry Treated by Vacuum Preloading

Wang

et al. 2021

Applied Sciences

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“…To ensure the retention of the soil without influencing the flow of seepage water, the design of geotextiles needs to meet several criteria, including retention, permeability, and anticlogging capabilities, which are often based on the relationship between the characteristic pore sizes O 95 or O 98 and soil grain sizes [1][2][3][4][5][6][7]. e filtration applications of geotextiles are typically subjected to tensile strains and result in noticeable variations of pore size and permeability in nonwoven geotextiles [8][9][10][11][12][13][14]. However, unstrained pore sizes are commonly tested and used in design, which induces the failure in the engineering application [8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…e filtration applications of geotextiles are typically subjected to tensile strains and result in noticeable variations of pore size and permeability in nonwoven geotextiles [8][9][10][11][12][13][14]. However, unstrained pore sizes are commonly tested and used in design, which induces the failure in the engineering application [8][9][10][11][12][13][14]. erefore, accurate determination of pore sizes at certain tensile strains is essential in the filtration design of nonwoven geotextiles.…”

Section: Introductionmentioning

confidence: 99%

“…ere is still limited theoretical model to predict the effect of uniaxial tensile strain on the pore sizes in geotextiles [13,14]. Based on the Poisson Polyhedron eory, which can predict a radius distribution of circles inscribed in the polygons, a series of theoretical models of pore size distributions (PSDs) of unstrained nonwoven structures and nonwoven geotextiles have been established [15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

“…e fibre orientation distribution is an important parameter in the model, which needs to be estimated by image analysis [17][18][19][20]. Due to the fact that the microscopes can typically focus on limited layers of the fibres, the samples employed in the literature were relatively thin, which were generally less than 250 g/m 2 [13][14][15][16][17][18][19][20][21][22][23]. If the sample is relatively thick, the fibres in deep layers will be blurry and cannot be evaluated with an optical microscope.…”

Section: Introductionmentioning

confidence: 99%

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Prediction of Pore Size Characteristics of Needle‐Punched Nonwoven Geotextiles Subjected to Uniaxial Tensile Strains

Lin

Tang

Zhong

et al. 2020

Advances in Civil Engineering

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A modified theoretical model has been proposed to predict the pore size characteristics of nonwoven geotextiles under certain uniaxial tensile strains, considering the difference between the out-of-plane Poisson’s ratio and the in-plane Poisson’s ratio of geotextiles. The pore size distributions (PSDs) and O95 subjected to different levels of uniaxial tensile strains in two needle-punched nonwoven geotextiles have been investigated by the dry sieving test. The variation of the fibre orientation with tensile strains and the corresponding effect on pore sizes has been evaluated by image analysis. The out-of-plane Poisson’s ratio and the in-plane Poisson’s ratio of geotextiles have been examined. A comparison has been made between the predictions of the original and the modified models. It is shown that the modified model can more accurately predict the decreasing rate of the PSDs, O95, and O98 than the original one. The corrected theoretical O95 and O98 under certain strains can provide a reference for the filtration design under engineering strains. The fibres reorientating to the loading direction result in the increase of the directional parameter with increasing tensile strains, which leads to the decrease of pore sizes. The theoretical PSDs are sensitive to the variation of directional parameter.

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The Effect of Pore Size Deformation on Multi-pore Model of Woven Geotextiles in Tension Test

Zhao

Tang

2018

Proceedings of the 8th International Congress on Environmental Geotechnics Volume 2

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Prediction of pore size characteristics of woven slit-film geotextiles subjected to tensile strains

Cited by 18 publications

References 18 publications

Numerical Investigating on Representativeness of Tracers in PIV Model Test of Dredged Slurry Treated by Vacuum Preloading

Numerical Investigating on Representativeness of Tracers in PIV Model Test of Dredged Slurry Treated by Vacuum Preloading

Prediction of Pore Size Characteristics of Needle‐Punched Nonwoven Geotextiles Subjected to Uniaxial Tensile Strains

The Effect of Pore Size Deformation on Multi-pore Model of Woven Geotextiles in Tension Test

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