Comparativo de metodologias de dimensionamento de estruturas reforçadas com geossintéticos em talude: análise determinística e probabilística

Abstract

There are several methodologies available in the literature and in regulations that aim at the design of soil structures reinforced with geosynthetics. However, the choice of the appropriate design method, together with the survey of the soil parameters under study, will provide the best means for the design of a reinforced soil structure. Thus, this work addresses the comparison between two methods of dimensioning soil reinforcement with geosynthetics, on slopes, to absorb the tensile strains and deformations that the reinforced structure is subjected to. The dimensions of the slope will be assumed based on a real structure of a study case, with data available in the literature, and the parameters of the soil will be adopted according to the case studied. The referred case is of a slope that came to rupture, probably due to the rapid rise in the water level. A computational modeling of this embankment was made, considering the hypothesis of insertion of geosynthetic reinforcements to verify the addition of the global safety factor of the embankment and, with this, analyze this modeling as a proposal that could have been adopted as a preventive measure to the rupture of that slope. After the simulations, the safety factor of the global structure (FS) was obtained in a deterministic way, using the limit equilibrium method. For the application of this method, the GeoStudio 2021 R2 software was used. Similarly, using the same software, the parameters of probability of failure (Pf) and reliability index (β) were obtained in a probabilistic way, using the Monte Carlo simulation method (SMC). This procedure was carried out with the purpose of identifying the design methodology that would supply a global safety factor that would provide values for the spacing and anchoring length of the reinforcements, in the most optimized way possible.