Influência da tensão normal aplicada, peso específico e umidade dos resíduos na resistência ao cisalhamento de resíduos sólidos urbanos aterrados.

Abstract

Depending on the dynamics of a landfill operation, the gravimetric composition of the waste and weather conditions, factors such as the applied normal stress, moisture content and unit weight of the waste vary at different points in the same landfill, which makes it difficult to determine a single strength parameter to represent Municipal Solid Waste (MSW), making it necessary to include these elements in the shear strength analysis. The objective of this work was to determine the shear strength of landfilled municipal solid waste, considering the variation of moisture and unit weight of the waste, as well as the normal stress applied. The experimental field for the development of this work was the Sanitary Landfill located in Campina Grande-PB, from where waste was removed at the age of one year, for characterization and direct shear tests following a factorial planning that made it possible to optimize the process of interaction between the factors, analyze their influence on the shear strength of the residues and formulate statistical models of shear stress. The variation of the applied normal stress, moisture content and unit weight of the waste influenced the shear strength parameters of the grounded MSW. Normal stress and unit weight were the factors that most influenced the shear stress of the studied samples, followed by moisture content. The generated models were significant for the determination of the shear stress of the grounded MSW, considering the effects of normal applied stress, the moisture content and unit weight of the waste.