Role of particle shape on the shear strength of sand-GCL interfaces under dry and wet conditions

Pillai, AG and Gali, ML (2022) Role of particle shape on the shear strength of sand-GCL interfaces under dry and wet conditions. In: Geotextiles and Geomembranes, 50 (2). 262 -281.

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Abstract

Interface shear strength of geosynthetic clay liners (GCL) with the sand particles is predominantly influenced by the surface characteristics of the GCL, size and shape of the sand particles and their interaction mechanisms. This study brings out the quantitative effects of particle shape on the interaction mechanisms and shear strength of GCL-sand interfaces. Interface direct shear tests are conducted on GCL in contact with a natural sand and a manufactured sand of identical gradation, eliminating the particle size effects. Results showed that manufactured sand provides effective particle-fiber interlocking compared to river sand, due to the favorable shape of its grains. Further, the role of particle shape on the hydration of GCL is investigated through interface shear tests on GCL-sand interfaces at different water contents. Bentonite hydration is found to be less in tests with manufactured sand, leading to better interface shear strength. Grain shape parameters of sands, surface changes related to hydration and particle entrapment in GCL are quantified through image analysis on sands and tested GCL surfaces. It is observed that the manufactured sand provides higher interface shear strength and causes lesser hydration related damages to GCL, owing to its angular particles and low permeability.

Item Type:	Journal Article
Publication:	Geotextiles and Geomembranes
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to the Elsevier Ltd.
Keywords:	Bentonite; Image analysis; Particle size; Particle size analysis; Sand; Shear flow, Dry and wet conditions; Geosynthetic clay liners; Image-analysis; Interaction mechanisms; Interface shear; Interface shear strength; Manufactured sand; Particle shape; Sand particles; Shears strength, Hydration
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	04 Jan 2022 05:39
Last Modified:	17 Jun 2022 05:13
URI:	https://eprints.iisc.ac.in/id/eprint/70858

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