Análise da Resistência ao Cisalhamento na Interface entre Geotêxteis e Solos Residuais Tropicais por meio de ensaios de Cisalhamento Direto convencionais
Análise da Resistência ao Cisalhamento na Interface entre Geotêxteis e Solos Residuais Tropicais por meio de ensaios de Cisalhamento Direto convencionais
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DOI: https://doi.org/10.22533/at.ed.0002403051
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Palavras-chave: Geotêxteis, Solos tropicais, cisalhamento de interface, resistência ao cisalhamento, compactação
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Keywords: Geotextiles,, Tropical soils, Interface shear, Shear strength, Compactation
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Abstract: This research aimed to examine the dynamics between compacted tropical soils and the integration of geosynthetic materials. For the study, soil samples from gneiss and amphibolite profiles were selected, standing out in the microregion of Viçosa, in the Zona da Mata of Minas Gerais. These were categorized, following the MCT classification, as VS soil, of non-lateritic sandy nature (NA’), and BR soil, of lateritic clayey character (LG’). In developing the soil-reinforcement sets, two types of biaxial woven polypropylene geotextiles (T55 and T25), as well as a needle-punched non-woven polyester geotextile (NT10), were used. The methodological approach included direct shear tests, applied to compacted samples under the energies defined by the Standard and Modified Proctor, both in configurations without geosynthetic inclusions (for reference) and in configurations that included the geotextiles. Special attention was given to the shear strength parameters of the interfaces, considering the stiffness of the geosynthetics, the typology of the soils, and the level of compaction energy. The most notable results indicated that: i) the interface friction angles (δ) were typically lower than those of the compacted soils alone (ϕ); ii) the presence of geotextiles increased the ductility of the soil-reinforcement sets; iii) the performance of the reinforcement was linked to its tensile stiffness; iv) the shear strength of the interfaces was slightly reduced in sandy soils.
- Marcela Giacometti de Avelar