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Influence of Suction on the Interface Characteristics of Unsaturated Marginal Lateritic Soil Backfills with Composite Geosynthetics
https://orcid.org/http://orcid.org/0000-0002-6085-6252
To address the concern of low-permeable backfills, a composite type of geosynthetics (CGR) which can perform the functions of drainage and reinforcement can be used in MSE structures. In the present study, interface shear strength characteristics of CGR were examined using large direct shear tests (300 mm × 300 mm × 200 mm) with an emphasis on the influence of suction on soil–reinforcement interaction. The influence of rainfall infiltration on soil–soil and soil–reinforcement interface characteristics was also evaluated. Loss of matric suction within the soil was observed due to rainwater infiltration which reduced the shear strength. It was observed that when rainfall infiltration caused an increase of 4% water content (Δw = + 4%), the apparent cohesion in soil due to suction (cs) was decreased by 71%. Whereas the corresponding reduction in apparent adhesion due to suction (ca(s)) was only 30% for CGR. Similarly, Δw = + 6%, due to rainwater infiltration caused a reduction of 91% in cs of soil whereas it was 38% for ca(s) in CGR. Rate of increase in cs and ca(s) is non-linear with suction. This paper demonstrates the reduction in shear strength and interface shear strength to be accounted for rainfall-induced wetting, while considering the marginal lateritic soil as the backfill for reinforced soil slopes/MSE walls.
Influence of Suction on the Interface Characteristics of Unsaturated Marginal Lateritic Soil Backfills with Composite Geosynthetics
https://orcid.org/http://orcid.org/0000-0002-6085-6252
To address the concern of low-permeable backfills, a composite type of geosynthetics (CGR) which can perform the functions of drainage and reinforcement can be used in MSE structures. In the present study, interface shear strength characteristics of CGR were examined using large direct shear tests (300 mm × 300 mm × 200 mm) with an emphasis on the influence of suction on soil–reinforcement interaction. The influence of rainfall infiltration on soil–soil and soil–reinforcement interface characteristics was also evaluated. Loss of matric suction within the soil was observed due to rainwater infiltration which reduced the shear strength. It was observed that when rainfall infiltration caused an increase of 4% water content (Δw = + 4%), the apparent cohesion in soil due to suction (cs) was decreased by 71%. Whereas the corresponding reduction in apparent adhesion due to suction (ca(s)) was only 30% for CGR. Similarly, Δw = + 6%, due to rainwater infiltration caused a reduction of 91% in cs of soil whereas it was 38% for ca(s) in CGR. Rate of increase in cs and ca(s) is non-linear with suction. This paper demonstrates the reduction in shear strength and interface shear strength to be accounted for rainfall-induced wetting, while considering the marginal lateritic soil as the backfill for reinforced soil slopes/MSE walls.
Influence of Suction on the Interface Characteristics of Unsaturated Marginal Lateritic Soil Backfills with Composite Geosynthetics
https://orcid.org/http://orcid.org/0000-0002-6085-6252
To address the concern of low-permeable backfills, a composite type of geosynthetics (CGR) which can perform the functions of drainage and reinforcement can be used in MSE structures. In the present study, interface shear strength characteristics of CGR were examined using large direct shear tests (300 mm × 300 mm × 200 mm) with an emphasis on the influence of suction on soil–reinforcement interaction. The influence of rainfall infiltration on soil–soil and soil–reinforcement interface characteristics was also evaluated. Loss of matric suction within the soil was observed due to rainwater infiltration which reduced the shear strength. It was observed that when rainfall infiltration caused an increase of 4% water content (Δw = + 4%), the apparent cohesion in soil due to suction (cs) was decreased by 71%. Whereas the corresponding reduction in apparent adhesion due to suction (ca(s)) was only 30% for CGR. Similarly, Δw = + 6%, due to rainwater infiltration caused a reduction of 91% in cs of soil whereas it was 38% for ca(s) in CGR. Rate of increase in cs and ca(s) is non-linear with suction. This paper demonstrates the reduction in shear strength and interface shear strength to be accounted for rainfall-induced wetting, while considering the marginal lateritic soil as the backfill for reinforced soil slopes/MSE walls.
Influence of Suction on the Interface Characteristics of Unsaturated Marginal Lateritic Soil Backfills with Composite Geosynthetics
Int. J. of Geosynth. and Ground Eng.
Dhanya, K. A. (author) / Venkatesh, T. S. D. (author) / Divya, P. V. (author)
2023-12-01
Article (Journal)
Electronic Resource
English
Design Guidance for Reinforced Soil Structures with Marginal Soil Backfills
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