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<p>This article evaluates soil shear strength and its interface with two types of geomembranes, textured and smooth, both in their original manufacturing conditions and subjected to different field aging processes. For this purpose, the textured geomembrane was subjected to an exposure protocol to leachate and in situ temperature. In contrast, the smooth geomembrane was exhumed from a leachate treatment pond, both from a large-scale operational landfill in the state of Rio Grande do Sul, Brazil. Direct shear tests were conducted under both unsaturated and flooded conditions. It was found that, regardless of the type of geomembrane, adhesion is reduced or eliminated with the flooding procedure. The soil–soil interface exhibited higher resistance than the interfaces with geomembranes, as geosynthetics create a contact surface between different materials. Geomembranes aged in the field produced irregularities that increased the friction angle, consequently improving resistance. Investigations at different scales of direct shear showed that the 100 × 100&#xa0;mm tests with Hyperbolic Fit and the 300 × 300&#xa0;mm tests did not show significant variations in friction angle, only in adhesion, due to the stress level of the tests.</p>

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Influence of Field-Aged Geomembranes on the Shear Behavior of Soil–Geomembrane Interfaces

  • 期刊论文

  • 发表日期：

    2025年10月6日

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  • Gabriéli Pires Chiarello,
  • Angelo Dotto Ragagnin Prior,
  • Paula Taiane Pascoal,
  • Magnos Baroni,
  • Rafael Cerqueira Silva

摘要

This article evaluates soil shear strength and its interface with two types of geomembranes, textured and smooth, both in their original manufacturing conditions and subjected to different field aging processes. For this purpose, the textured geomembrane was subjected to an exposure protocol to leachate and in situ temperature. In contrast, the smooth geomembrane was exhumed from a leachate treatment pond, both from a large-scale operational landfill in the state of Rio Grande do Sul, Brazil. Direct shear tests were conducted under both unsaturated and flooded conditions. It was found that, regardless of the type of geomembrane, adhesion is reduced or eliminated with the flooding procedure. The soil–soil interface exhibited higher resistance than the interfaces with geomembranes, as geosynthetics create a contact surface between different materials. Geomembranes aged in the field produced irregularities that increased the friction angle, consequently improving resistance. Investigations at different scales of direct shear showed that the 100 × 100 mm tests with Hyperbolic Fit and the 300 × 300 mm tests did not show significant variations in friction angle, only in adhesion, due to the stress level of the tests.