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Resumo(s)
A expansão da Linha Circular do Metro de Lisboa consiste na ligação das estações do Rato e do Cais do
Sodré, através da execução de 2 km de linha em túnel subterrâneo que, aquando da sua escavação,
atravessa maciços rochosos heterogéneos que apresentam desafios geotécnicos e hidrogeológicos. Este
relatório de estágio analisa e relaciona as classificações geomecânicas RMR, Q-System e o índice
geotécnico GSI, que são utilizadas para a caracterização de maciços rochosos, com o objetivo de
compreender e avaliar o comportamento do maciço rochoso durante a escavação do Túnel.
A metodologia de escavação de túneis e as medidas de suporte adotadas são fundamentais para garantir
o dimensionamento da estabilidade das escavações. Além de analisar as correlações entre as
classificações geomecânicas, este estudo também compara as medidas de suporte recomendadas pelas
classificações com as medidas de suporte previstas em projeto.
A recolha contínua dos dados geológicos e geomecânicos da frente de escavação permitiram a realização
de fichas de acompanhamento, que caracterizam e classificam o maciço. Reunindo todas as fichas é
possível analisar os dados geomecânicos e encontrar correlações entre classificações.
As correlações obtidas são resultados valiosos na área da geologia de engenharia e da engenharia
geotécnica, pois não só enriquecem o conhecimento teórico sobre a escavação de túneis em maciços
rochosos, como também tem importantes implicações práticas para engenheiros e profissionais
envolvidos na construção e gestão de infraestruturas subterrâneas.
The expansion of the Lisbon Metro Circular Line consists of the connection of the Rato and Cais do Sodré stations, through the execution of a 2 km underground tunnel line that, at the time of its excavation, crosses heterogeneous rock masses that present geotechnical and hydrogeological challenges. This internship report analyzes and relates the RMR, Q-System, geomechanical classifications and GSI geotechnical index, which are used for to characterize of rock masses, aiming to understand and assess the behavior of the rock mass during tunnel excavation. The tunneling methodology and support measures adopted are essential to ensure the design stability of the excavations. Therefore, in addition to analyzing the correlations between the geomechanical classifications, this study also compares the support measures recommended by the classifications with the support measures provided in the project. The continuous collection of geological and geomechanical data from the excavation front allowed the realization of follow-up sheets, which characterize and classify the rock mass. By combining all the information together, it is possible to analyze the geomechanical data and find correlations between classifications. The correlations obtained are valuable results in the field of engineering geology and geotechnical engineering as they not only enrich the theoretical knowledge about tunneling in rock masses but also have important practical implications for engineers and professionals involved in the construction and management of underground structures.
The expansion of the Lisbon Metro Circular Line consists of the connection of the Rato and Cais do Sodré stations, through the execution of a 2 km underground tunnel line that, at the time of its excavation, crosses heterogeneous rock masses that present geotechnical and hydrogeological challenges. This internship report analyzes and relates the RMR, Q-System, geomechanical classifications and GSI geotechnical index, which are used for to characterize of rock masses, aiming to understand and assess the behavior of the rock mass during tunnel excavation. The tunneling methodology and support measures adopted are essential to ensure the design stability of the excavations. Therefore, in addition to analyzing the correlations between the geomechanical classifications, this study also compares the support measures recommended by the classifications with the support measures provided in the project. The continuous collection of geological and geomechanical data from the excavation front allowed the realization of follow-up sheets, which characterize and classify the rock mass. By combining all the information together, it is possible to analyze the geomechanical data and find correlations between classifications. The correlations obtained are valuable results in the field of engineering geology and geotechnical engineering as they not only enrich the theoretical knowledge about tunneling in rock masses but also have important practical implications for engineers and professionals involved in the construction and management of underground structures.
Descrição
Relatório de estágio de mestrado, Geologia (Geologia Aplicada e Ambiental), 2025, Universidade de Lisboa, Faculdade de Ciências
Palavras-chave
Métodos de Escavação em túnel RMR (Rock Mass Rating) Q-System GSI (Geological Strength Index) Medidas de suporte Teses de mestrado - 2025
