Hydraulic conductivity requirement of granular and geotextile filter for internally stable soils

Kalore, Shubham A.; Babu, G. L. Sivakumar

doi:10.1016/j.geotexmem.2022.02.003

Cited by 9 publications

(2 citation statements)

References 21 publications

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“…The validation of Eq. ( 15) is provided by Kalore and Sivakumar Babu [16]. The developed criterion is independent of the thickness of filter, indicating the applicability of the criterion to granular and geotextile filters.…”

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confidence: 92%

Recent developments in design criteria for granular and geotextile filters

Kalore

Babu

2023

E3S Web Conf.

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Granular and geotextile filters are commonly provided in several hydrological infrastructures to limit soil erosion and allow unimpeded water seepage. The success of a filter depends on forming a bridging structure, which is governed by the grain size distribution of soil and the constriction size distribution of filter. Currently, the retention requirement is satisfied considering representative grain and opening size, whereas the hydraulic conductivity requirement is satisfied considering empirical factors for avoiding excessive clogging. In this paper, the design criteria for granular and geotextile filters are reviewed, and improved design criteria are presented. A probabilistic retention criterion is developed, considering the grain size and constriction size as random variables. The influence of filter thickness is incorporated into the criterion by considering the number of constrictions in a filtration path. A hydraulic conductivity criterion is developed theoretically based on governing flow equations and the expected partial clogging of geotextiles. The limit states for the developed criteria are evaluated based on the wide range of experimental data. The developed design criteria are applicable to granular and nonwoven geotextiles, which offers an improvement in design compared to the existing criteria in practice.

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Section: ( ) ( )mentioning

confidence: 92%

Recent developments in design criteria for granular and geotextile filters

Kalore

Babu

2023

E3S Web Conf.

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“…3 Geotextile has been widely used in filtration and drainage of tailings ponds because of its advantages of convenient construction, energy conservation, environmental protection, reliable quality and low price. 4,5 The study of geotextiles in the filtration field, including new types of geotextiles, 6 design criteria of geotextiles, 7 and long-term filtration performance of geotextiles 8 is attracting more attention.…”

Section: Introductionmentioning

confidence: 99%

Filtration characteristics of composite filter of woven-nonwoven geotextile in tailings ponds

Liu

Wang

et al. 2022

Journal of Industrial Textiles

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Nonwoven geotextiles are widely used in tailings ponds for filtration and drainage, but there is a risk of failure of nonwoven geotextile due to physical clogging. In this study, to reduce the clogging of nonwoven geotextile filter in tailings ponds and improve its long-term drainage performance, a layer of woven geotextile is placed between tailings and nonwoven geotextile to form a composite filter of woven-nonwoven geotextile. A series of gradient ratio tests were conducted to study the influence of the aperture of woven geotextile on the filtration characteristics of composite filter. The long-term filtration performance of composite filter was evaluated, and the filtration mechanism of composite filter was revealed. The results show that after adding a layer of woven geotextile with reasonable aperture upon the nonwoven geotextile, the gradient ratio of filter decreased and the flow rate of filter significantly increased. The filtration performance of composite filter of geotextile was better than that of nonwoven geotextile filter. The aperture of woven geotextile had an important influence on the filtration characteristics of composite filter. With the increase of the aperture of woven geotextile, the gradient ratio value of the composite filter decreased first and then increased. For relatively dense tailings, the recommended ratio of the equivalent aperture of woven geotextile (O95) to the characteristic particle diameter of tailings (d85) s is about 1.6.

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