A Cyclic Gradient Ratio Test Device

Nonwoven geotextile have been widely used for filtration. In this paper, the clogging potential for a soil-geotextile system were assessed using laboratory tests. An ASTM modified gradient ratio test device was used to determine gradient ratio as well as soil-gradient ratio. One type of nonwoven geotextile and soil were used to simulate the conditions in drainage system. The obtained results indicate that the gradient ratio and soil-gradient ratio increases with time because of clogging mechanism. However, the tested geotextile can be used as fi lter for soil with fine content of 20%.

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Rapid Assessment of Geotextile Clogging Potential Using the Flexible Wall Gradient Ratio Test

Geosynthetics Research and Development in Progress ◽

10.1061/40782(161)1 ◽

2008 ◽

Author(s):

T. D. Bailey ◽

M. D. Harney ◽

R. D. Holtz

Keyword(s):

Rapid Assessment ◽

Ratio Test ◽

Flexible Wall ◽

Gradient Ratio

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Closure to “Discussion on ‘A Critical Evaluation of the Gradient Ratio Test’ by M. H. Akram and M. A. Gabr” by R. Jonathan Fannin, Yoginder P. Vaid, and Yucheng Shi

Geotechnical Testing Journal ◽

10.1520/gtj11010j ◽

1995 ◽

Vol 18 (3) ◽

pp. 389

Author(s):

HJ Pincus ◽

RJ Fannin ◽

YP Vaid ◽

Y Shi

Keyword(s):

Critical Evaluation ◽

Ratio Test ◽

Gradient Ratio

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Discussion on “A Critical Evaluation of the Gradient Ratio Test” by R. Jonathan Fannin, Yoginder P. Vaid, and Yucheng Shi

Geotechnical Testing Journal ◽

10.1520/gtj11009j ◽

1995 ◽

Vol 18 (3) ◽

pp. 389

Author(s):

HJ Pincus ◽

MH Akram ◽

MA Gabr

Keyword(s):

Critical Evaluation ◽

Ratio Test ◽

Gradient Ratio

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Effect of the Number of Constrictions on the Filtration Behaviour of a Soil-Geotextile System

Fibres and Textiles in Eastern Europe ◽

10.5604/01.3001.0013.5862 ◽

2020 ◽

Vol 28 (1(139)) ◽

pp. 87-92

Author(s):

Anna Miszkowska ◽

Eugeniusz Koda ◽

Zygmunt Krzywosz

Keyword(s):

Selection Criteria ◽

Fine Particles ◽

Filter Design ◽

Ratio Test ◽

Flow Through ◽

Gradient Ratio ◽

Geotextile Filters ◽

Nonwoven Geotextile ◽

Geotextile Filter ◽

Base Soil

Nonwoven geotextile filters have been used in geo-environmental engineering for decades to prevent the movement of base soil fine particles, allowing adequate seepage to flow through the geotextile plane. Most of the design criteria developed for nonwoven geotextiles are based only on the comparison between their characteristic opening size and the indicative diameter of the soil to be filtered. In the meantime, the nonwoven geotextile fibrous structure has an influence on the filtration of the soil-geotextile system. In this paper the numbers of constrictions of nonwoven geotextile samples were determined to verify the existence of a correlation between the geotextile structure and the filtration behaviour of soil-geotextile systems. The compatibility between an internally unstable soil and a nonwoven geotextile filter was evaluated using the gradient ratio test. The results obtained can also be the basis for modifying the geotextile filter design and selection criteria.

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