Propriedades mecânicas em micro e mesoescala de solos do Rio Grande do Sul
Autor(a) principal: | |
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Data de Publicação: | 2015 |
Tipo de documento: | Tese |
Idioma: | por |
Título da fonte: | Biblioteca Digital de Teses e Dissertações do UFSM |
Texto Completo: | http://repositorio.ufsm.br/handle/1/3368 |
Resumo: | Susceptibility to soil degradation is a function of disturbance intensity and structure resistance, which is usually described by mesoscale properties. However, soil mechanical strength in the microscale (micromechanical) evaluated by rheology is not well known. The objective was to evaluate the micromechanical resistance of soils of Rio Grande do Sul through amplitude sweep tests under oscillatory shear, to know the variables that influence this resistance and to evaluate its relationship with physical and mechanical properties in mesoscale. Surface and subsurface horizons of eight soils, Oxisol (4), Ultisol (2), Alfisol (1) and Vertisol (1), were characterized for particle size, mineralogy, chemical, physical and mechanical in micro and mesoscale. The micromechanical resistance of soils was evaluated by rheological curves and parameters, and the influence of water content on rheological parameters was evaluated by regression analysis. The influence of soil composition on rheological parameters and the relationship between rheological parameters and physical and mechanical properties were evaluated by correlation analysis and principal component analysis. There was great variation between soils and horizons according its constitution of particle size, mineralogy and chemistry, where sand, clay, total carbon and presence of 2:1 clay minerals were the most influential factors on rheological behavior of the soils. Soil matric potential also had a strong influence on micromechanics resistance of soils. There were correlations of rheological parameters with physical properties (bulk density and soil porosity), but few correlations with mesomechanical properties (uniaxial compressibility and direct shear). The higher silt and clay content increased the microstructural resistance of the soil, where higher sand content decreased this resistance. The predominance of smectite in clay fraction increased the microstructural elasticity; the increased of kaolinite decreased the elasticity and the increased of iron oxides raised the microstructural stiffness (shear stress) of the soils. Increased water pressure increased micromechanical resistance of most soils due to meniscus force, occurring reduction in micromechanics stiffness at 10 kPa pressure due to presence of pseudosand associated with low bulk density. The increase of carbon content increased soil elasticity, but decreased soil rigidity; and cations content correlated only indirectly with rheological parameters. The larger correlation between rheological parameters and physical properties is probably due to aggregation factors being the same in both scales, such as particle size, mineralogy and their interactions. On the other hand, the low relation of soil mechanical resistance in micro and mesoscale seem influenced by different factors related to soil composition and structure. |
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2017-04-062017-04-062015-03-06PÉRTILE, Patricia. Mechanical properties at micro and mesoscale of soils of Rio Grande do Sul. 2015. 166 f. Tese (Doutorado em Agronomia) - Universidade Federal de Santa Maria, Santa Maria, 2015.http://repositorio.ufsm.br/handle/1/3368Susceptibility to soil degradation is a function of disturbance intensity and structure resistance, which is usually described by mesoscale properties. However, soil mechanical strength in the microscale (micromechanical) evaluated by rheology is not well known. The objective was to evaluate the micromechanical resistance of soils of Rio Grande do Sul through amplitude sweep tests under oscillatory shear, to know the variables that influence this resistance and to evaluate its relationship with physical and mechanical properties in mesoscale. Surface and subsurface horizons of eight soils, Oxisol (4), Ultisol (2), Alfisol (1) and Vertisol (1), were characterized for particle size, mineralogy, chemical, physical and mechanical in micro and mesoscale. The micromechanical resistance of soils was evaluated by rheological curves and parameters, and the influence of water content on rheological parameters was evaluated by regression analysis. The influence of soil composition on rheological parameters and the relationship between rheological parameters and physical and mechanical properties were evaluated by correlation analysis and principal component analysis. There was great variation between soils and horizons according its constitution of particle size, mineralogy and chemistry, where sand, clay, total carbon and presence of 2:1 clay minerals were the most influential factors on rheological behavior of the soils. Soil matric potential also had a strong influence on micromechanics resistance of soils. There were correlations of rheological parameters with physical properties (bulk density and soil porosity), but few correlations with mesomechanical properties (uniaxial compressibility and direct shear). The higher silt and clay content increased the microstructural resistance of the soil, where higher sand content decreased this resistance. The predominance of smectite in clay fraction increased the microstructural elasticity; the increased of kaolinite decreased the elasticity and the increased of iron oxides raised the microstructural stiffness (shear stress) of the soils. Increased water pressure increased micromechanical resistance of most soils due to meniscus force, occurring reduction in micromechanics stiffness at 10 kPa pressure due to presence of pseudosand associated with low bulk density. The increase of carbon content increased soil elasticity, but decreased soil rigidity; and cations content correlated only indirectly with rheological parameters. The larger correlation between rheological parameters and physical properties is probably due to aggregation factors being the same in both scales, such as particle size, mineralogy and their interactions. On the other hand, the low relation of soil mechanical resistance in micro and mesoscale seem influenced by different factors related to soil composition and structure.A suscetibilidade do solo à degradação é função da intensidade da perturbação e da resistência da estrutura, a qual é normalmente descrita por propriedades em mesoescala. Entretanto, a resistência mecânica do solo em microescala (micromecânica) avaliada por meio da reologia é pouco conhecida. O objetivo foi avaliar a resistência micromecânica de solos do Rio Grande do Sul com o uso de testes de varredura de amplitude por cisalhamento oscilatório, conhecer as variáveis que influenciam essa resistência e avaliar sua relação com propriedades físicas e mecânicas em mesoescala. Os horizontes superficial e subsuperficial de oito solos das ordens Latossolo (4), Argissolo (2), Planossolo (1) e Vertissolo (1) foram caracterizados quanto à granulometria, mineralogia, propriedades químicas, físicas e mecânicas em micro e mesoescala. A resistência micromecânica dos solos foi avaliada por curvas e parâmetros reológicos e a influência do conteúdo de água sobre parâmetros reológicos foi avaliada por análise de regressão. A influência da composição do solo nos parâmetros reológicos e a relação entre parâmetros reológicos e propriedades físicas e mesomecânicas foram avaliadas por análise de correlação e análise de componentes principais. Houve grande variação entre os solos e horizontes quanto à sua constituição granulométrica, mineralógica e química, sendo areia, argila, carbono e presença de argilominerais 2:1 os fatores que mais influenciaram o comportamento reológico dos solos. A tensão de água também teve forte influência na resistência micromecânica dos solos. Foram verificadas correlações de parâmetros reológicos com propriedades físicas (densidade e porosidade do solo), mas poucas correlações com propriedades mesomecânicas (compressibilidade uniaxial e cisalhamento direto). O aumento dos teores de silte e argila aumentou a resistência micromecânica do solo, enquanto maiores teores de areia diminuíram essa resistência. O predomínio de esmectita na fração argila aumentou a elasticidade microestrutural; a caulinita diminuiu a elasticidade; e o aumento de óxidos de ferro aumentou a rigidez (tensão de cisalhamento) microestrutural dos solos. O aumento da drenagem aumentou a resistência micromecânica da maioria dos solos devido ao aumento das forças de meniscos, ocorrendo redução da rigidez micromecânica na tensão de água de 10 kPa em horizontes com presença de pseudoareia associada com baixa densidade do solo. O incremento dos teores de carbono aumentou a elasticidade do solo, mas diminuiu sua rigidez; e os teores de cátions correlacionaram-se indiretamente com parâmetros reológicos. A maior relação entre parâmetros reológicos e propriedades físicas decorre, provavelmente, dos fatores de agregação serem os mesmos em ambas as escalas, como a granulometria, a mineralogia e suas interações. Por outro lado, a relação da resistência mecânica do solo em micro e mesoescala foi pequena, pois parecem influenciadas por diferentes fatores relacionados à composição e estrutura do solo.Coordenação de Aperfeiçoamento de Pessoal de Nível Superiorapplication/pdfporUniversidade Federal de Santa MariaPrograma de Pós-Graduação em Ciência do SoloUFSMBRAgronomiaReologiaReometriaCompressibilidadeCisalhamento diretoMineralogiaGranulometriaMatéria orgânicaConteúdo de águaRheologyRheometryCompressibilityDirect shearMineralogyParticle sizeOrganic matterWater contentCNPQ::CIENCIAS AGRARIAS::AGRONOMIA::CIENCIA DO SOLOPropriedades mecânicas em micro e mesoescala de solos do Rio Grande do SulMechanical properties at micro and mesoscale of soils of Rio Grande do Sulinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisReichert, José Miguelhttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4787840U9Albuquerque, Jackson Adrianohttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4768301T7Gubiani, Paulo Ivonirhttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4710781D1Dalmolin, Ricardo Simão Dinizhttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4760008Z3Pinheiro, Rinaldo Jose Barbosahttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4780835T4http://lattes.cnpq.br/6570550072616464Pértile, Patricia500100100005400300300300500300300a85444db-3c89-4606-bf03-0e1915842baa612c6002-db85-4ab3-a5e4-b82bb6416842be92eaa3-7443-4971-a9cf-a24000f86357afe70a3b-8823-4520-9efd-dc8ea9caa6a0750eb2c1-f987-4631-91bc-c8d2ddc3b4b9117ee8b3-29b8-4014-8734-2e7771497800info:eu-repo/semantics/openAccessreponame:Biblioteca Digital de Teses e Dissertações do UFSMinstname:Universidade Federal de Santa Maria (UFSM)instacron:UFSMORIGINALPERTILE, PATRICIA.pdfapplication/pdf4030755http://repositorio.ufsm.br/bitstream/1/3368/1/PERTILE%2c%20PATRICIA.pdfadc43f54a364fbfa1199f0e7febd580aMD51TEXTPERTILE, PATRICIA.pdf.txtPERTILE, PATRICIA.pdf.txtExtracted texttext/plain344048http://repositorio.ufsm.br/bitstream/1/3368/2/PERTILE%2c%20PATRICIA.pdf.txtbd75a77a381a58c492c244942fc661deMD52THUMBNAILPERTILE, PATRICIA.pdf.jpgPERTILE, PATRICIA.pdf.jpgIM Thumbnailimage/jpeg4780http://repositorio.ufsm.br/bitstream/1/3368/3/PERTILE%2c%20PATRICIA.pdf.jpge1c561a90764d9d429d2c0b7a6ecdaf9MD531/33682017-07-25 10:54:25.113oai:repositorio.ufsm.br:1/3368Biblioteca Digital de Teses e Dissertaçõeshttps://repositorio.ufsm.br/ONGhttps://repositorio.ufsm.br/oai/requestatendimento.sib@ufsm.br||tedebc@gmail.comopendoar:2017-07-25T13:54:25Biblioteca Digital de Teses e Dissertações do UFSM - Universidade Federal de Santa Maria (UFSM)false |
dc.title.por.fl_str_mv |
Propriedades mecânicas em micro e mesoescala de solos do Rio Grande do Sul |
dc.title.alternative.eng.fl_str_mv |
Mechanical properties at micro and mesoscale of soils of Rio Grande do Sul |
title |
Propriedades mecânicas em micro e mesoescala de solos do Rio Grande do Sul |
spellingShingle |
Propriedades mecânicas em micro e mesoescala de solos do Rio Grande do Sul Pértile, Patricia Reologia Reometria Compressibilidade Cisalhamento direto Mineralogia Granulometria Matéria orgânica Conteúdo de água Rheology Rheometry Compressibility Direct shear Mineralogy Particle size Organic matter Water content CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::CIENCIA DO SOLO |
title_short |
Propriedades mecânicas em micro e mesoescala de solos do Rio Grande do Sul |
title_full |
Propriedades mecânicas em micro e mesoescala de solos do Rio Grande do Sul |
title_fullStr |
Propriedades mecânicas em micro e mesoescala de solos do Rio Grande do Sul |
title_full_unstemmed |
Propriedades mecânicas em micro e mesoescala de solos do Rio Grande do Sul |
title_sort |
Propriedades mecânicas em micro e mesoescala de solos do Rio Grande do Sul |
author |
Pértile, Patricia |
author_facet |
Pértile, Patricia |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Reichert, José Miguel |
dc.contributor.advisor1Lattes.fl_str_mv |
http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4787840U9 |
dc.contributor.referee1.fl_str_mv |
Albuquerque, Jackson Adriano |
dc.contributor.referee1Lattes.fl_str_mv |
http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4768301T7 |
dc.contributor.referee2.fl_str_mv |
Gubiani, Paulo Ivonir |
dc.contributor.referee2Lattes.fl_str_mv |
http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4710781D1 |
dc.contributor.referee3.fl_str_mv |
Dalmolin, Ricardo Simão Diniz |
dc.contributor.referee3Lattes.fl_str_mv |
http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4760008Z3 |
dc.contributor.referee4.fl_str_mv |
Pinheiro, Rinaldo Jose Barbosa |
dc.contributor.referee4Lattes.fl_str_mv |
http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4780835T4 |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/6570550072616464 |
dc.contributor.author.fl_str_mv |
Pértile, Patricia |
contributor_str_mv |
Reichert, José Miguel Albuquerque, Jackson Adriano Gubiani, Paulo Ivonir Dalmolin, Ricardo Simão Diniz Pinheiro, Rinaldo Jose Barbosa |
dc.subject.por.fl_str_mv |
Reologia Reometria Compressibilidade Cisalhamento direto Mineralogia Granulometria Matéria orgânica Conteúdo de água |
topic |
Reologia Reometria Compressibilidade Cisalhamento direto Mineralogia Granulometria Matéria orgânica Conteúdo de água Rheology Rheometry Compressibility Direct shear Mineralogy Particle size Organic matter Water content CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::CIENCIA DO SOLO |
dc.subject.eng.fl_str_mv |
Rheology Rheometry Compressibility Direct shear Mineralogy Particle size Organic matter Water content |
dc.subject.cnpq.fl_str_mv |
CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::CIENCIA DO SOLO |
description |
Susceptibility to soil degradation is a function of disturbance intensity and structure resistance, which is usually described by mesoscale properties. However, soil mechanical strength in the microscale (micromechanical) evaluated by rheology is not well known. The objective was to evaluate the micromechanical resistance of soils of Rio Grande do Sul through amplitude sweep tests under oscillatory shear, to know the variables that influence this resistance and to evaluate its relationship with physical and mechanical properties in mesoscale. Surface and subsurface horizons of eight soils, Oxisol (4), Ultisol (2), Alfisol (1) and Vertisol (1), were characterized for particle size, mineralogy, chemical, physical and mechanical in micro and mesoscale. The micromechanical resistance of soils was evaluated by rheological curves and parameters, and the influence of water content on rheological parameters was evaluated by regression analysis. The influence of soil composition on rheological parameters and the relationship between rheological parameters and physical and mechanical properties were evaluated by correlation analysis and principal component analysis. There was great variation between soils and horizons according its constitution of particle size, mineralogy and chemistry, where sand, clay, total carbon and presence of 2:1 clay minerals were the most influential factors on rheological behavior of the soils. Soil matric potential also had a strong influence on micromechanics resistance of soils. There were correlations of rheological parameters with physical properties (bulk density and soil porosity), but few correlations with mesomechanical properties (uniaxial compressibility and direct shear). The higher silt and clay content increased the microstructural resistance of the soil, where higher sand content decreased this resistance. The predominance of smectite in clay fraction increased the microstructural elasticity; the increased of kaolinite decreased the elasticity and the increased of iron oxides raised the microstructural stiffness (shear stress) of the soils. Increased water pressure increased micromechanical resistance of most soils due to meniscus force, occurring reduction in micromechanics stiffness at 10 kPa pressure due to presence of pseudosand associated with low bulk density. The increase of carbon content increased soil elasticity, but decreased soil rigidity; and cations content correlated only indirectly with rheological parameters. The larger correlation between rheological parameters and physical properties is probably due to aggregation factors being the same in both scales, such as particle size, mineralogy and their interactions. On the other hand, the low relation of soil mechanical resistance in micro and mesoscale seem influenced by different factors related to soil composition and structure. |
publishDate |
2015 |
dc.date.issued.fl_str_mv |
2015-03-06 |
dc.date.accessioned.fl_str_mv |
2017-04-06 |
dc.date.available.fl_str_mv |
2017-04-06 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/doctoralThesis |
format |
doctoralThesis |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
PÉRTILE, Patricia. Mechanical properties at micro and mesoscale of soils of Rio Grande do Sul. 2015. 166 f. Tese (Doutorado em Agronomia) - Universidade Federal de Santa Maria, Santa Maria, 2015. |
dc.identifier.uri.fl_str_mv |
http://repositorio.ufsm.br/handle/1/3368 |
identifier_str_mv |
PÉRTILE, Patricia. Mechanical properties at micro and mesoscale of soils of Rio Grande do Sul. 2015. 166 f. Tese (Doutorado em Agronomia) - Universidade Federal de Santa Maria, Santa Maria, 2015. |
url |
http://repositorio.ufsm.br/handle/1/3368 |
dc.language.iso.fl_str_mv |
por |
language |
por |
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500100100005 |
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400 300 300 300 500 300 300 |
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openAccess |
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Universidade Federal de Santa Maria |
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Programa de Pós-Graduação em Ciência do Solo |
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UFSM |
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BR |
dc.publisher.department.fl_str_mv |
Agronomia |
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Universidade Federal de Santa Maria |
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