Avaliação da resistência de resíduos sólidos urbanos por meio de ensaios de cisalhamento direto em equipamento de grandes dimensões

• Ano de defesa: 2006
• Autor(a) principal: Henrique Lembi Martins
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Minas Gerais; UFMG
• Palavras-chave em Português: Resíduos sólidos urbanos; Geotecnia experimental; Parâmetros geotécnico; Mecânica do solo; Aterro sanitário; Recursos hídricos Desenvolvimento; Engenharia sanitária; Saneamento
• Link de acesso: http://hdl.handle.net/1843/FRPC-6ZNJ2D

In the last years, in Brazil and abroad, due to the increase of restrictions of the environmental legislation, the design and operation of safe facilities for municipal solid wastes disposal, such as the sanitary landfills, have demanded the development of new technologies. Additionally, the lack of areas for waste disposal near to urban centers has led to vertical expansions of the existing sanitary landfills and, consequently, more rigorous stability analyses. Thus, the study of the mechanical behavior of the wastes becomes very important, especially, the shear strength. The present work aims to contribute to the understanding of the mechanical behavior of municipal solid wastes, through the construction of a large dimension direct shear equipment and the accomplishment of an experimental program to evaluate the shear strength of municipal solid wastes. The tests were carried out in samples with different initial conditions of composition, unit weight and moisture content, and age. Specific objectives of this work are to verify the Mohr-Coulomb failure criteria validity and to evaluate qualitatively the model proposed by Kolsch (1993 and 1995), which has shown to be more appropriate for municipal solid wastes. Besides the description of the developed equipment, the curves of shear stress versus horizontal displacement, strength envelopes and strength parameters variation with horizontal displacement are presented. The behavior of all the tested samples was characterized by a continuous strength gain without failure identification. The presence of fibrous materials led to a significant strength increase in relation to the samples without fibers. The strength parameters values (friction angle and cohesive intercept) were located inside the range presented in the literature. In respect to the Mohr-Coulomb envelope validity, it was verified that the samples with low fiber contents presented a linear failure criterion. The samples with high fiber contents presented a trend of a bi-linear failure criterion. The equipment developed and used in the tests and the used methodology shown to be appropriate.