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Advisor(s)
Abstract(s)
O objetivo deste trabalho consistiu em analisar essencialmente as propriedades físicas e químicas de diferentes tipos de solos de modo a poder categorizá-los com particular enfase no seu comportamento aplicado à escavação de fundações profundas com estabilização de solos recorrendo a fluídos poliméricos.
Atendendo à estrutura polifásica dos solos e, também, à natureza e quantidade de material fino presente, que em muitas circunstâncias explicam a menor capacidade de carga para as solicitações impostas durante a construção ou na vida útil das estruturas, pareceu pertinente caracterizar e avaliar as propriedades dos solos que eventualmente poderão ter uma influência no respetivo comportamento, face às exigências de trabalhabilidade e estabilidade dos mesmos.
Assim, e sob o ponto de vista geotécnico, tentou-se ainda abordar os principais fatores que controlam a estabilidade de misturas de solo e agregado, nomeadamente a distribuição dos calibres das partículas dos solos, a proporção de partículas finas e a plasticidade dos materiais finos.
Numa primeira fase foi realizada uma pesquisa bibliográfica incidente nos ensaios laboratoriais realizados, as inter relações conhecidas entre os seus diversos parâmetros e as características básicas dos elementos utilizados na estabilização dos solos. De seguida, foram realizados ensaios laboratoriais a diferentes amostras de solo com várias origens de modo a verificar as características físicas e químicas de cada um. Por fim, foram estabelecidas relações entre as diferentes características analisadas de cada uma das amostras de solo e, tendo como base essa comparação, foram definidos os parâmetros que têm mais impacto na estabilidade dos solos com o objetivo da construção de uma fundação profunda.
The objective of this work was essentially to analyse the physical and chemical proprieties of different soils with a view to their categorization, with a particular emphasis in their behaviour applied to the digging off deep foundations with soil stabilization using fluidic polymers. Relatively to the soil polyfasic structure, as well as their nature and amount of fine material present, that in many circumstances accounts for a lower strength in relation to the loading applied during the structures building and lifespan, it seemed relevant to characterize and evaluate the soil proprieties that may have an influence regarding to its behaviour faced with their workability and stability demands. That way, under a geotechnical perspective, it was attempted to approach the main factors that control soil and aggregate mixtures stability, namely the different soil particles calibres distribution, their fine particles ratio and their plasticity. In a first stage a bibliographical study was made, focussing on the laboratorial tests made, the relationship between its various parameters and the basic characteristics of the materials used in soil stabilization. Then, laboratorial tests were made to different soil samples with various origins with the goal to ascertain their physical and chemical characteristics. Lastly, relations between the different studied proprieties of each soil were made, with a special focus on the parameters that have a bigger impact in soil stabilization with the purpose of the installation of deep foundations.
The objective of this work was essentially to analyse the physical and chemical proprieties of different soils with a view to their categorization, with a particular emphasis in their behaviour applied to the digging off deep foundations with soil stabilization using fluidic polymers. Relatively to the soil polyfasic structure, as well as their nature and amount of fine material present, that in many circumstances accounts for a lower strength in relation to the loading applied during the structures building and lifespan, it seemed relevant to characterize and evaluate the soil proprieties that may have an influence regarding to its behaviour faced with their workability and stability demands. That way, under a geotechnical perspective, it was attempted to approach the main factors that control soil and aggregate mixtures stability, namely the different soil particles calibres distribution, their fine particles ratio and their plasticity. In a first stage a bibliographical study was made, focussing on the laboratorial tests made, the relationship between its various parameters and the basic characteristics of the materials used in soil stabilization. Then, laboratorial tests were made to different soil samples with various origins with the goal to ascertain their physical and chemical characteristics. Lastly, relations between the different studied proprieties of each soil were made, with a special focus on the parameters that have a bigger impact in soil stabilization with the purpose of the installation of deep foundations.
Description
Keywords
Solos Ensaios geotécnicos laboratoriais Estabilidade de furo Granulometria dos solos Propriedades dos solos Soils Geotechnical laboratory tests Excavation hole stability Soil particle size Soil properties