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81 - DESEMPENHO NÃO DRENADO DE ARGILA PURA E REFORÇADA COM FIBRAS DE AÇAÍ EM ENSAIOS INUNDADOS DE DIRECT SIMPLE SHEAR (DSS)

Doi: 10.47094/COBRAMSEG2026.6/81

PALAVRAS CHAVE: DSS, Fibras de açaí, Argila tropical, Resistência não drenada.

KEYWORDS: DSS; Açaí fibers; Tropical clay; Undrained shear strength.

ABSTRACT:
This study evaluated the mechanical behavior of a tropical clay reinforced with 1% açaí fibers through Direct Simple Shear (DSS) tests. The experiments were conducted under consolidated-undrained and inundated conditions, at vertical stresses of 200, 400, and 800 kPa, aiming to address gaps in the literature regarding the use of this reinforcement under volume- controlled conditions. The results demonstrated consistent benefits from the açaí reinforcement: there was a 4.34° increase in the effective friction angle, while the analysis of stress paths revealed that the inclusion of fibers mitigated the generation of positive pore water pressure, preserving the effective normal stress more efficiently than the pure soil. Regarding stiffness, an increase in the secant shear modulus ($G$) was observed, although stiffness degradation followed similar patterns. Reinforcement with açaí fibers proves to be an effective strategy for improving the stability and ductility of saturated clayey soils, establishing itself as a sustainable alternative for geotechnical engineering.

Autores

  • Augusto Barbosa Silva

  • José Wilson dos Santos Ferreira

  • Lídia Bruna Teles Gonzaga

  • Michéle Dal Toé Casagrande

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