Propriedades geomecânicas de um solo compactado com vermiculita para fins de cobertura em aterro de resíduos
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Data
2013-02-26
Autores
Vieira, Kristian Sales [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
A cobertura final de um aterro de resíduos se dá quando a última célula alcança sua cota mais alta. Os principais objetivos da cobertura final em aterros são: minimizar a infiltração de água de chuva, limitar a emissão descontrolada de gases proveniente da decomposição dos resíduos, suprimir a proliferação de vetores, fornecer uma superfície adequada para a revegetação e servir como o elemento central na recuperação do local. Esta pesquisa tem o propósito de analisar as características geotécnicas (mecânicas e hidráulicas) de um solo residual maduro de biotita gnaisse compactado como vermiculita expandida verificando a aplicabilidade desta mistura para construção de cobertura de aterros de resíduos. A vermiculita é um material inodoro, não abrasivo e não carcinogênico e suas propriedades de superfície, em especial a porosidade e carga superficial negativa, promovem a esta material alto poder de absorvente e carreador de nutrientes. Incialmente foram realizados ensaios de absorção de água e de secagem ao ar em amostras compactadas com diferentes porcentagens em volume de vermiculita acrescentada ao solo. Os resultados preliminares mostraram que a relação vermiculita/solo na razão de 40% em volume de solo compactado apresentou um melhor resultado para os testes realizados. A absorção de água atingiu 51% quando comparada ao solo natural (14%) e com relação à perda de massa esta mesma mistura apresentou uma estabilidade de 72 horas a umidade absorvida enquanto o solo natural após 24 horas de secagem ao ar a umidade inicial já havia sico alcançada. Também foram realizados ensaios complementares tais como curva característica, ensaio de compressão diametral e compressão simples, compressibilidade e adensamento, resistência ao cisalhamento direto, permeabilidade e ensaio de formação de trinca...
The final cover for a landfill of waste occurs when the last cell reaches its highest elevation, and he main objectives of this cover are: to minimize infiltration of rainwater, to limit the uncontrolled emission of gases of gases from the decomposition of waste, to suppress the proliferation of vectors, to provide a suitable surface for revegetation and serving as the central element in the recovery site. This study aims to analyze the geotechnical characteristics (mechanical and hydraulic) of soil residual biotite gneiss mature compacted with expanded vermiculite and to verify the applicability of this mixture for construction in waste landfill cover. Vermiculite is a odorless, non-abrasive, non-carcinogenic material, in addition their surface properties, in particular the porosoty and surface charge negative, make this material a high power of absorving and nutrient carrier. Initially, were performed tests by water absorption and drying compressed air in samples with different percentages by volume of vermiculite added to the soil. Preliminary results showed that the vermiculite/soil ratio of 40% by volume of compacted soil was better for the tests. The water absorption reached a value of 51% compared to the natural soil (14%) and with about the mass loss, that same mixture showed a stability of 72 hours of the absorved moisture while the natural soil, after 24 hours by drying the initial moisture content had already been achieved. Then, were conducted additional tests such as the characteristic curve, diametral compreension test, simply compressive compressibility and density, direct shear strength, permeability and formation tests crack. Considering the results presented, the use of expanded vermicule to the soil compacted presents itself as a alternative for a final landfill of waste cover
The final cover for a landfill of waste occurs when the last cell reaches its highest elevation, and he main objectives of this cover are: to minimize infiltration of rainwater, to limit the uncontrolled emission of gases of gases from the decomposition of waste, to suppress the proliferation of vectors, to provide a suitable surface for revegetation and serving as the central element in the recovery site. This study aims to analyze the geotechnical characteristics (mechanical and hydraulic) of soil residual biotite gneiss mature compacted with expanded vermiculite and to verify the applicability of this mixture for construction in waste landfill cover. Vermiculite is a odorless, non-abrasive, non-carcinogenic material, in addition their surface properties, in particular the porosoty and surface charge negative, make this material a high power of absorving and nutrient carrier. Initially, were performed tests by water absorption and drying compressed air in samples with different percentages by volume of vermiculite added to the soil. Preliminary results showed that the vermiculite/soil ratio of 40% by volume of compacted soil was better for the tests. The water absorption reached a value of 51% compared to the natural soil (14%) and with about the mass loss, that same mixture showed a stability of 72 hours of the absorved moisture while the natural soil, after 24 hours by drying the initial moisture content had already been achieved. Then, were conducted additional tests such as the characteristic curve, diametral compreension test, simply compressive compressibility and density, direct shear strength, permeability and formation tests crack. Considering the results presented, the use of expanded vermicule to the soil compacted presents itself as a alternative for a final landfill of waste cover
Descrição
Palavras-chave
Resíduos, Aterros, Vermiculita, Infiltração, Geotecnologia ambiental, Waste products
Como citar
VIEIRA, Kristian Sales. Propriedades geomecânicas de um solo compactado com vermiculita para fins de cobertura em aterro de resíduos. 2013. 114 f. Dissertação (mestrado) - Universidade Estadual Paulista Júlio de Mesquita Filho, Faculdade de Engenharia, 2013.