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25 - AVALIAÇÃO DA RESISTÊNCIA DE INTERFACE SOLO-GEOMEMBRANA E MULTICAMADAS SOB ALTAS TENSÕES NORMAIS

Doi: 10.47094/COBRAMSEG2026.6/25

PALAVRAS CHAVE: Resistência de interface, Cisalhamento direto, Geomembrana PEAD Texturizada, Altas Tensões Normais.

KEYWORDS: Interface friction, Direct shear test, Textured HDPE geomembrane, High normal stresses.

ABSTRACT:
The stability of geotechnical structures incorporating lining systems is strongly influenced by the mechanical behavior of interfaces formed between geomembranes and adjacent materials. The shear strength mobilized at these interfaces results from the interaction between the geomembrane properties and the characteristics of the soil or other geosynthetics in contact and is commonly determined through laboratory testing. Although numerous studies addressing interface shear strength are available in the literature, many investigations consider relatively limited ranges of normal stresses, which may reduce the representativeness of the results when compared to field loading conditions. In applications such as landfill liner systems and heap leach pads, however, interfaces may be subjected to significantly higher stress levels, requiring experimental evaluation under more representative loading conditions. In this context, this study investigated the interface shear strength between a double-sided textured high-density polyethylene (HDPE) geomembrane, 2.0 mm thick, compacted soil, and a nonwoven geotextile. Large-scale direct shear tests were conducted using a shear box measuring 300 mm × 300 mm in accordance with ASTM D5321, under normal stresses ranging from 200 kPa to 800 kPa and under both dry and saturated conditions. The results indicated significant differences in the shear strength parameters defined by the Mohr–Coulomb criterion.

Autores

  • Ana Laura Cassini Souza Bernardinelli

  • André Coutinho Lima

  • Daniel Moreno Meucci

  • Débora Toledo Vieira da Silva

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