Evaluation on interface shear strength of a bentonite-polymer geosynthetic clay liner and a smooth geomembrane
Evaluation on interface shear strength of a bentonite-polymer geosynthetic clay liner and a smooth geomembrane
Interface shear tests were conducted to investigate the interface shear strength between bentonite-polymer (B-P) geosynthetic clay liners (GCL) with a smooth geomembrane (GMBS). One B-P GCL consisted of linear polymer and one sodium (Na-B) GCL was used as a control. Tests were conducted at displacement rate of 0.1 mm/min under four normal stress levels. Free hydration conditions were used to represent the worst field condition during the service life of GCL, whereas dry conditions were used as control. The shear strength envelop under free hydration conditions for Na-B GCL was liner whereas for B-P GCL was non-liner. In addition, the peak shear strength for B-P GCL and Na-B GCL under dry conditions was similar. The peak shear strength for B-P GCL was significantly lower than that for Na-B GCL. The polymer hydrogel was visible in the interface after shearing, suggesting the polymer in the interface was like to cause the lower shear strength.
H. Zhao; Kuo Tian
9th International Congress on Environmental Geotechnics (ICEG2023)
Geosynthetics for the Geoenvironment
Shear Strength of Underground Materials, Geosynthetics for Reinforcement, Geosynthetics
https://doi.org/10.53243/ICEG2023-238
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