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

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 int...

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Bibliographic Details
Published in:Geotextiles and geomembranes 2022-04, Vol.50 (2), p.262-281
Main Authors: Pillai, Anjali G., Gali, Madhavi Latha
Format: Article
Language:English
Subjects:
Bentonite
Clay liners
Entrapment
Geosynthetics
Hydration
Image analysis
Interface shear
Interfacial shear strength
Manufactured sand
Particle shape
Particle size
Sand
Sand & gravel
Shape effects
Shear strength
Shear stress
Shear tests
Size effects
Surface properties
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Summary: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. •Interface direct shear tests are carried out on sand-GCL interfaces.•Effects of hydration are studied through tests on dry and wet sands.•Sand particle shape is characterized through image analysis.•Surface changes in GCL are correlated to the particle shape and hydration effects.•Feasibility of replacing natural sands in landfill liners with manufactured sand is investigated
ISSN:0266-1144
1879-3584
DOI:10.1016/j.geotexmem.2021.11.004