Comportamento hidráulico de misturas de solos visando o uso em camada de cobertura em um aterro sanitário

Abstract

The landfill cover layer is a structure whose purpose is to isolate solid waste from the surface and prevent contamination of the soil, water and air. Analysis of the performance of this layer is necessary to ensure the efficiency and safety of landfills, both from a geotechnical and environmental point of view. Some of the aspects that need to be assessed are: the strength and deformability of the layer, drainage and gas retention capacity, permeability and stability against erosive processes. These factors depend on the properties of the materials used in the lining layer, climatic conditions and the operation of the landfill. This study presents an analysis of the performance of applicable mixtures for the landfill cover layer, with the aim of evaluating the effect of the granulometry and permeability of the mixtures and comparing the results with the criteria established in the regulations and in the literature. These tests were carried out in the laboratory with samples in different proportions. The results showed that the permeability of the mixtures decreased as the clay fraction increased, while also meeting the necessary geotechnical characteristics. It was concluded that it is possible to use the soil mixture for its application, since the best adjusted granulometry increases the material's performance.