Estudo do comportamento mecânico de solos residuais de arenitos da Bacia Sedimentar do Paraná, para emprego em pavimentação ferroviária
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Data
2024-02-28
Autores
Cardoso, Lívia Mattedi
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Universidade Federal do Espírito Santo
Resumo
Soils and aggregates are the main materials used in paving activities. Therefore, it is important to study the materials available in the project implementation region to economize on costs related to material transportation and the exploitation of new quarries. The selection of materials to compose the layers of railway pavement, according to current normative recommendations, is still based on traditional classification criteria, such as the California Bearing Ratio (CBR), which does not reflect the reality of Brazilian conditions, as it was conceived from the study of temperate climate soils. Tropical soils, typical of Brazil, undergo a weathering process that provides notable properties from a pavement engineering perspective, highlighted by their satisfactory mechanical resistance and low expansibility. The mechanistic approach to pavement design allows for a detailed analysis of the mechanical behavior of each layer of the pavement structure, enabling the assessment of stress and strain states based on Resilient Modulus values. However, due to the significant geotechnical variability of Brazilian soils, obtaining this parameter through specific laboratory tests is limited by cost issues, often necessitating the use of simpler and more economical tests, such as physical characterization tests. Since the use of traditional classification criteria can result in the constant rejection of materials that would be suitable from a mechanistic standpoint, a better understanding of the mechanical behavior of these soils is necessary. Thus, this study aims to analyze the resilient behavior of tropical soils to develop a predictive model for the Resilient Modulus from physical characterization tests, such as grain size distribution, consistency limits, and compaction. The relevance of this effort is highlighted by the high cost of tests to obtain the Resilient Modulus, justifying the need to seek correlations to estimate it, especially during the preliminary design phase, aiming to optimize costs and resources. Additionally, this work explores the possibility of using materials that, although not meeting the criteria of current traditional classifications, still present mechanical qualities suitable for application in railway pavements. To achieve the proposed objectives, 74 physical characterization tests, Resilient Modulus tests, and classification tests of tropical soils were analyzed in samples collected in the municipality of São José do Rio Preto – SP, belonging to the geological unit of the Paraná Sedimentary Basin. The results of the statistical analyses indicated good adherence between the Resilient Modulus tests and the physical characterization of lateritic soils
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Módulo de resiliência , Análise mecanicista , Solos tropicais , Solos lateríticos , Pavimento ferroviário