Desenvolvimento de um permeâmetro para determinação da condutividade hidráulica saturada e não saturada de solos

• Autor(a) principal: Guimarães, Lucas Martins
• Data de Publicação: 2008
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/3704
• topic: Solos não saturados; Equipamento; Condutividade hidráulica; Unsaturated soils; Equipment; Hydraulic conductivity; CNPQ::ENGENHARIAS::ENGENHARIA CIVIL::GEOTECNICA

When an earth dam or the stability of a slope is projected is investigated, is important to know about the hydraulic conductivity of the soil, in saturated conditions and unsaturated conditions. It is fundamental the determination of the hydraulic conductivity of linners constructed in the base of industrial embankments, landfills, etc.. The equipments more used calculate the saturated hydraulic conductivity and, using low gradients, close to the ones in the field, they don't have precision to determine hydraulic conductivities smaller than 10-6 cm/s. However, many Brazilian environmental organizations demand that the linners must have hydraulic conductivity smaller than 10-7 cm/s, which, certainly, is contradictory with the precision of the existent equipments. The main objective of this dissertation is to project, to build and to put in operation, a permeameter with suction control to determine the hydraulic conductivity in saturated and unsaturated soils, using a flow bomb to impose a constant flow in the sample. The methodology used was that of the permanent regime where they monitored the flow rates and monitored the differences in pressure between the top and bottom of the sample. The equipment consists of a wall permeameter of flexible, pump flow with reduced diameter, a monitoring system with a pressure differential transducer and interfaces air / water. The permeameter is able to determine hydraulic conductivity with values greater than 10-10 cm / sec. The tests were performed in trajectories of drying, and conducting trials in the future trajectories of wetting and can thus assess the effect of hysteresis in the soil. Compared to the results obtained experimentally with the curves of the theoretical methods of VAN GENUCHTEN (1980) and GARDNER (1958). The conclusions obtained in this research are presented, in which the adequate functioning of the new equipment is emphasizing, as well as the need of carrying a larger number of tests.