Non Saturated Soils
Mostrando 1-12 de 13 artigos, teses e dissertações.
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1. Estimativa de propriedades hidráulicas de solos a partir do ensaio de ascensão capilar / Estimating the hydraulic properties of soils from capillary rise test
This study evaluates the potential of capillary rise test and a parameter optimization technique to estimate soil hydraulic parameters. The capillary rise is a simple and expedite test that is conditioned by soil hydraulic properties. In the mathematical representation of the capillary rise we used the model of Terzaghi (1943), who considered that saturated
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/08/2012
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2. Resistência de um solo não saturado a partir de ensaios com teor de umidade constante (CW) / Shear strength of an unsaturated soil from constant water content tests
In many parts of the world, geotechnical engineers frequently deal with unsaturated soils, and the performance of constructions on such soils depends on their mechanical characteristics, and among them, the shear strength. The unsaturated soil shear strength can be experimentally determined by using techniques which allow soil suction control or measurement
Publicado em: 2010
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3. Back analysis the landslides in residual soils unsaturated / Retroanálise de escorregamentos em solos residuais não saturados
Five historical cases of landslides in the city of Salvador, Bahia, were studied through the survey and treatment of the preexistent data. Complementary experiments were accomplished through the instrumentation field using tensiometers and laboratory testing. The back-analysis, main objective of this research, was accomplished through the geometries of each
Publicado em: 2008
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4. DESENVOLVIMENTO DE UM SISTEMA TRIAXIAL SERVO-CONTROLADO E AVALIAÇÃO DO COMPORTAMENTO MECÂNICO DE UM SOLO RESIDUAL DE BIOTITA GNAISSE / DEVELOPMENT OF A SERVO-CONTROLLED TRIAXIAL EQUIPAMENT AND EVALUATION OF MECHANICAL BEHAVIOUR OF A BIOTITE-GNEISS RESIDUAL SOIL
This dissertation presents a study of the mechanical properties of biotite gneiss residual soil found at Alto Leblon, Rio de Janeiro, and the development of a triaxial equipment for unsaturated soil testing. An experimental program has been created to study the mechanical behaviour of soil. The methodology proposed by this campaign is: (a) physical character
Publicado em: 2008
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5. Análise do comportamento de estacas strauss submetidas a carregamento horizontal no solo da região de Londrina - PR
In Londrina city, Strauss piles are frequently used as retaining structure for building basement excavation, being submitted to horizontal load. However, the projects of such retaining structures are usually conducted using design methods that do not take the concrete cracking of pile transversal section and the properties of lateritic tropical soil into acc
Publicado em: 2008
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6. Equipment cubic triaxial for rehearsals in saturated soils and no saturated with suction controlled matric / Equipamento triaxial cúbico para ensaios em solos saturados e não-saturados com sucção matricial controlada
In tropical countries, like Brazil, soils in non saturated condition are frequently encountered. Besides, the majority of geotechnical works load the ground according to stress paths in which the three principal stresses are different and vary independently. Therefore, the need to develop equipments able to test in the laboratory non saturated soil samples f
Publicado em: 2007
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7. Numerical simulation of the water movement and solutes in soil unsaturated / Simulação numérica do movimento de água e solutos em solos não saturados
The interest in studying problems of underground drainage and solutos transport not in soils saturated it has been increasing significantly in the last years, mainly because of the growing concern with the quality of the soil and of the environment in general. Applied fertilizers in agricultural lands move below the zone radicular of the plants and they can
Publicado em: 2007
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8. Estacas submetidas a esforços horizontais em solos colapsiveis do interior de São Paulo, nas condições natural, melhorada e inundada / Horizontally loaded piles in collapsible soils of the interior of the state of São Paulo, under the conditions of natural humidity, improved soil and pre-flooded soil
The problem with piles loaded horizontally at the top is frequently met in civil construction projects and there is a reduced bibliography on the parameters to be adopted in designoA more critical situation is that of horizontally loaded piles in high porosity, non saturated and collapsible soils. The objectives of this paper are: (1) produce subsidies for t
Publicado em: 2006
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9. A COUPLED MODEL FOR TWO-PHASE FLOW THROUGH ELASTOPLASTIC POROUS MEDIA / UM MODELO ACOPLADO PARA FLUXO BIFÁSICO EM MEIOS POROSOS ELASTOPLÁSTICOS
This dissertation studies a coupled flow and deformation model for saturated and non-saturated soils, based on Biot`s theory but taking into account the nonlinear material behavior of soil. In the non-saturated condition the fluid flow can be considered either as a two-phase or an one-phase problem. In the two-phase case, the model calculates the pressure of
Publicado em: 2005
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10. Projeto, ConstruÃÃo e ValidaÃÃo de um Sistema de CompressÃo Uniaxial para Estimativa da CompactaÃÃo do Solo
The compaction of the agricultural soils has worldwide importance because of the increasing of the farm with machinery resulting in the increasing of heavy machines for cultivation system, mainly, in the developed countries. The term, soils compaction refers to the compression carried out on the non-saturated soil, during which an increase of bulk density ex
Publicado em: 2005
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11. Interface strength between geomembranes and soils by ring shear test / Resistência de Interface entre geomembranas e solos através do ensaio de Ring Shear
This paper deals with the shear strength in the geomembrane-soil interfaces used in landfill and waste pond liners. Modified ring shear tests were carried out using sandy and clayey soils, in dry and saturated conditions. The tests were performed using a coarse to medium graded sand and a clayey soil from a sanitary landfill in Piracicaba - SP. In this work,
Publicado em: 2003
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12. Microemulsões a base de óleos vegetais: formação, propriedades e emprego na descontaminação EX-SITU de Solo / Vegetable oil-based microemulsions: formation, properties and application for "exsitu" soil decontamination
In the present project, we were interested in assessing the use of Brazilian vegetable oils in the "ex-situ" decontamination of soils from polycyclic aromatic hydrocarbons (PAHs). In this process, contaminated soil is treated with a microemulsion (µE) composed of water (W) /commercial non-ionic surfactant (S) C9/11EO4 /oil (O). The latter term refers to the
Publicado em: 2000