Análise unificada dos critérios de resistência de geomateriais em ensaios triaxiais e de cisalhamento direto

• Autor(a) principal: Fernandes, Lucas Rodrigues
• Data de Publicação: 2021
• Outros Autores: [e-mail]
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UERJ
• Texto Completo: http://www.bdtd.uerj.br/handle/1/17276
• topic: Civil engineering; Strength of materials; Shear; Geology; Engenharia civil; Resistência de materiais; Cisalhamento; Geologia; ENGENHARIAS::ENGENHARIA CIVIL::GEOTECNICA

The present work aims to investigate the rupture of geological materials, from the point of view of resistance envelopes, from the perspective of complex systems. More precisely, data from laboratory tests of direct and triaxial shear in soft, sandy and gravel for road ballast (reinforced or not with geogrids) are analyzed, adopting mathematical expressions in power law, characteristics of critical phenomena (fractals). In addition, a unified resistance criterion is applied, applicable to the results of laboratory tests, for the different loading paths and types of materials analyzed. The unified equation, applied to the analysis of the resistance of rocky and sedimentary materials, proved to be adequate to the analyzed materials, and its correlation coefficient very close to the unit. Compared to the empirical criteriaproposed by several authors, the suggested relationship was more general, producing similar results, when applied to the particular materials studied in this research. We also investigated the best way to represent the results of experimental resistance. In this sense, starting from the proposed expression, we arrived at a simpler and elementary representation of the experimental resistance results, as well as the empirical nonlinear resistance criteria proposed in the technical literature. Consequently, the transformation of non-linear mechanical resistance laws into simpler linear universal representations reveals the enormous potential of applying mathematical expressions in power laws to geomaterial degradation and rupture phenomena, which are governed by a dynamic structure space-time invariant by scale (fractal). However, due to the reduced number of experimental results, it was not possible to define exactly the real physical meaning of the parameters that make up the proposed equation.