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Abstract(s)
A importância de Vila Nova de Gaia como a terceira maior cidade portuguesa e como centro de intensa actividade económica e cultural conduz a uma constante necessidade de expansão. O aumento da densidade populacional acarreta a realização de projectos complexos de engenharia, utilizando o subsolo para a construção e, frequentemente, em terrenos com características geotécnicas desfavoráveis. Estes factos, associados à escassez de estudos científicos recentes de natureza geológica e geotécnica em Gaia, justificam o estudo preliminar de geotecnia urbana da zona ribeirinha de Vila Nova de Gaia.
É reconhecido que as descontinuidades desempenham um papel determinante nas propriedades mecânicas de um maciço rochoso, nomeadamente em taludes, sendo assim extremamente importantes na avaliação do comportamento estrutural do maciço rochoso. Desta forma, as propriedades das descontinuidades deverão ser contempladas nas descrições e caracterizações, nos mapas geológicos aplicados e nos cálculos envolvidos em estruturas de engenharia desenvolvidas num maciço rochoso. Este trabalho enfatiza a importância de um estudo geológico e geotécnico para um melhor conhecimento da estabilidade dos taludes rochosos graníticos da zona ribeirinha de Vila Nova de Gaia (entre o Cais de Gaia, Santa Marinha e a praia de Lavadores – Canidelo).
Este trabalho envolveu, inicialmente, uma caracterização topográfica, morfoestrutural e geotectónica da área de estudo e, numa fase posterior, a avaliação geotécnica e geomecânica de diversos taludes rochosos. Os principais constrangimentos geológicos, geotécnicos e geomecânicos foram compilados e integrados para os taludes estudados. Para esta caracterização recorreu‐se à técnica da amostragem linear aplicada a superfícies expostas do maciço. Além disso, foi avaliada a resistência à compressão uniaxial do materialrocha com base em ensaios esclerométricos. Procedeu‐se, ainda, a um tratamento estatístico das descontinuidades, bem como dos parâmetros geológico‐geotécnicos e geomecânicos a estas associados sugeridos pela ISRM. Todos os dados foram representados cartograficamente numa base apoiada pelos Sistemas de Informação Geográfica.
The importance of Vila Nova de Gaia city as the third largest Portuguese city and as a centre of intense economic and cultural activity leads to a constant need for expansion. The strong pressure of urbanization increases urban population density and, in turn, guides to the undertaking of complex engineering projects, using the subsoil for underground construction or, often, undertaking construction on ground which has unfavourable geotechnical characteristics. These reasons, associated with very limited scientific recent work on the geological and geotechnical nature of Gaia, justified the preliminary study of a comprehensive urban geotechnical insight of the Vila Nova de Gaia riverside downtown. It has been recognized that discontinuities have a major influence on the mechanical properties of a rock mass, namely on slopes. This perception has major consequences for the assessment of the engineering behaviour of a rock mass. Descriptions and characterizations, engineering geological maps and calculations for engineering structures on a rock mass have to include discontinuity properties. This work emphasizes the importance of a geological and geotechnical study to a better understanding of granitic rock slopes stability in Vila Nova de Gaia riverside downtown (between Cais de Gaia, Santa Marinha and Lavadores beach – Canidelo). This study involved, previously, a topographic, morphostructural and geotectonical characterization of the study area and, in a subsequent stage, a geotechnical and geomechanical assessment from several rock slope exposures. The main geological, geotechnical and geomechanical constraints were compiled and integrated along the studied slopes. For this characterization, the scanline sampling technique of discontinuities has been applied to the study of free rock‐mass faces. In addition, uniaxial compressive strength was estimated by means of Schmidt hardness. As well, the evaluation methods of field data for discontinuities sets and the statistical characterisation of all their ISRM parameters are also presented. All compiled data was followed by a cartographic representation based on a Geographic Information System.
The importance of Vila Nova de Gaia city as the third largest Portuguese city and as a centre of intense economic and cultural activity leads to a constant need for expansion. The strong pressure of urbanization increases urban population density and, in turn, guides to the undertaking of complex engineering projects, using the subsoil for underground construction or, often, undertaking construction on ground which has unfavourable geotechnical characteristics. These reasons, associated with very limited scientific recent work on the geological and geotechnical nature of Gaia, justified the preliminary study of a comprehensive urban geotechnical insight of the Vila Nova de Gaia riverside downtown. It has been recognized that discontinuities have a major influence on the mechanical properties of a rock mass, namely on slopes. This perception has major consequences for the assessment of the engineering behaviour of a rock mass. Descriptions and characterizations, engineering geological maps and calculations for engineering structures on a rock mass have to include discontinuity properties. This work emphasizes the importance of a geological and geotechnical study to a better understanding of granitic rock slopes stability in Vila Nova de Gaia riverside downtown (between Cais de Gaia, Santa Marinha and Lavadores beach – Canidelo). This study involved, previously, a topographic, morphostructural and geotectonical characterization of the study area and, in a subsequent stage, a geotechnical and geomechanical assessment from several rock slope exposures. The main geological, geotechnical and geomechanical constraints were compiled and integrated along the studied slopes. For this characterization, the scanline sampling technique of discontinuities has been applied to the study of free rock‐mass faces. In addition, uniaxial compressive strength was estimated by means of Schmidt hardness. As well, the evaluation methods of field data for discontinuities sets and the statistical characterisation of all their ISRM parameters are also presented. All compiled data was followed by a cartographic representation based on a Geographic Information System.
Description
Mestrado em Engenharia Geotécnica e Geoambiente
Keywords
Geotecnia urbana Cartografia geotécnica Cartografia SIG Geomecânica Vila Nova de Gaia Urban geotechnics Geotechnical cartography GIS mapping Geomechanics
Citation
Publisher
Instituto Politécnico do Porto. Instituto Superior de Engenharia do Porto