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Abstract(s)
Uma característica de ocupação territorial, que é observada tanto no Brasil como em Portugal, é a elevada densidade populacional das cidades localizadas próximo ao litoral. A partir dessa configuração territorial, se tornou necessária a construção de importantes obras de infraestrutura urbana, que são responsáveis por proporcionar mais qualidade de vida para as pessoas que residem nesses aglomerados urbanos. No entanto, outra característica comum a ambos os países, por vezes, é a presença de solos com fracas características geotécnicas no litoral, denominados de solos moles. A presença desse tipo de solo no litoral, é explicado pelo processo de formação dos solos litorâneos, nos quais se encontram em um estado não consolidado. Muitas dessas importantes obras de infraestruturas, localizadas nas cidades litorâneas, encontram-se assentes sobre os solos moles. A fundação dessas obras, geralmente mais trabalhosas, necessitam de uma atenção especial durante a conceção e execução, pois caso contrário, podem apresentar patologias em toda a estrutura, através das fissuras. Para as edificações que se encontram comprometidas pelo assentamento diferencial das fundações, é necessário conceber uma solução de reforço. Uma das alternativas disponíveis para o reforço de fundações é o jet-grouting, que é uma tecnologia, descrita no presente trabalho, baseada na melhoria das propriedades mecânicas do solo. O jet-grouting apresenta algumas limitações, pois é uma técnica cara, quando comparada com as tecnologias mais tradicionais de reforço da fundação. Para além disso, não existe um consenso sobre o dimensionamento dessa tecnologia, quando é aplicada para o reforço das fundações. Neste estudo se propõe estudar duas diferentes metodologias de dimensionamento das colunas de jetgrouting, encontradas em referenciais bibliográficos internacionais, que são o método de Bustamante (2002) e o método das microestacas. Essas duas diferentes metodologias foram aplicadas para dimensionar as colunas de jet-grouting, utilizadas como reforço de uma edificação existente.
A characteristic of territorial occupation, which is observed in both Brazil and Portugal, is the high population density of cities located near the coast. From this territorial configuration, it became necessary to construct important urban infrastructure works, which are responsible for providing more quality of life for the people living in these urban agglomerations. However, another characteristic common for both countries is the presence of soils with weak geotechnical characteristics on the coast, called soft soils. The presence of this type of soil on the coast is explained by the process of formation of the coastal soils, in which they are in an unconsolidated state. Many of these important infrastructure works, located in coastal cities, are based on soft soils. The foundation of these works, generally more laborious, require special attention during design and execution, otherwise they may present pathologies throughout the structure through cracks. For buildings that are compromised by the differential settling of foundation, it is necessary to devise a reinforcement solution. One of the alternatives available for the reinforcement of foundations is jetgrouting, which is a technology, described in the present work, based on the improvement of the mechanical properties of the soil. Jet-grouting has some limitations, as it is an expensive technique when compared to more traditional foundation reinforcement technologies. Furthermore, there is no consensus on the design of this technology, when it is applied to reinforce foundations. In this study it is proposed to study two different jet-grouting column sizing methodologies, found in international bibliographic references, which are the Bustamante method (2002) and the micro-cutting method. These two different methodologies were applied to design jet-grouting columns, used as reinforcement of an existing building.
A characteristic of territorial occupation, which is observed in both Brazil and Portugal, is the high population density of cities located near the coast. From this territorial configuration, it became necessary to construct important urban infrastructure works, which are responsible for providing more quality of life for the people living in these urban agglomerations. However, another characteristic common for both countries is the presence of soils with weak geotechnical characteristics on the coast, called soft soils. The presence of this type of soil on the coast is explained by the process of formation of the coastal soils, in which they are in an unconsolidated state. Many of these important infrastructure works, located in coastal cities, are based on soft soils. The foundation of these works, generally more laborious, require special attention during design and execution, otherwise they may present pathologies throughout the structure through cracks. For buildings that are compromised by the differential settling of foundation, it is necessary to devise a reinforcement solution. One of the alternatives available for the reinforcement of foundations is jetgrouting, which is a technology, described in the present work, based on the improvement of the mechanical properties of the soil. Jet-grouting has some limitations, as it is an expensive technique when compared to more traditional foundation reinforcement technologies. Furthermore, there is no consensus on the design of this technology, when it is applied to reinforce foundations. In this study it is proposed to study two different jet-grouting column sizing methodologies, found in international bibliographic references, which are the Bustamante method (2002) and the micro-cutting method. These two different methodologies were applied to design jet-grouting columns, used as reinforcement of an existing building.
Description
Keywords
Ocupação territorial Solos moles Jet-grouting Reforço do solo Dimensionamento Territorial occupation Soft soils Soil reinforcement Sizing