Improved design criteria for nonwoven geotextile filters with internally stable and unstable soils

Kalore, SA and Sivakumar Babu, GL (2022) Improved design criteria for nonwoven geotextile filters with internally stable and unstable soils. In: Geotextiles and Geomembranes .

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Abstract

In geotextile filtration, the soil fines are either accumulated near the interface, clogged, or washed out, which primarily depends on the grain size distribution (GSD) of soil and the constriction size distribution (CSD) of geotextile. Also, the movement of fines significantly affects the flow capacity of geotextile. Currently, the retention requirement is satisfied based on representative grain and opening sizes, whereas the hydraulic conductivity and clogging requirements are satisfied considering the properties of virgin geotextile. This paper presents a probabilistic retention criterion considering the grain and constriction sizes as random variables. The influence of geotextile thickness is incorporated into the criterion by considering the number of geotextile constrictions in a filtration path. A theoretical approach to predict CSD is presented if the measured data is unavailable. For hydraulic conductivity and clogging requirements, a criterion is presented considering the expected partial clogging of geotextile, which is predicted based on the semi-analytical approach. The limit states for the developed criteria are evaluated based on the wide range of experimental data from the current study and published literature. The developed design criteria are applicable to internally stable and unstable soils, which offers an improvement in design compared to the existing criteria in practice.

Item Type:	Journal Article
Publication:	Geotextiles and Geomembranes
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to the Elsevier Ltd.
Keywords:	Geotextiles; Grain size and shape; Size distribution; Soils, Clogging; Constriction sizes; Design criteria; Geotextile filters; Grainsize; Improved designs; Internally stable; Nonwoven geotextiles; Retention; Size-distribution, Hydraulic conductivity
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	31 Aug 2022 06:50
Last Modified:	31 Aug 2022 06:50
URI:	https://eprints.iisc.ac.in/id/eprint/76289

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