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O presente trabalho pretende aprofundar e desenvolver o estudo hidrogeomecânico de maciços rochosos fraturados nas antigas minas de água dos mananciais de Paranhos-Salgueiros (Área Urbana do Porto, NW de Portugal). Além de contribuir para um melhor conhecimento hidrogeomecânico do local e da influência da infiltração das águas subterrâneas nestes maciços. Uma abordagem multitécnica permitiu uma análise hidrogeomecânica abrangente de todo o maciço rochoso. A aplicação dos índices hidrogeomecânicos ‘Hydro-Potential Value’ (HP-Value) e ‘Hydraulic Conductivity System’ (HC-System) assistiu à avaliação da qualidade e circulação geohidráulica do maciço rochoso, envolvendo uma análise geológico-geotécnica, geomecânica e hidrogeomecânica de toda a extensão do túnel através de dados obtidos por campanhas de campo, e diferentes propriedades das águas subterrâneas como o caudal (Q), a condutividade hidráulica (K), a transmissividade (T) e a capacidade específica (Q/s). O zonamento hidrogeomecânico permitiu dividir o maciço em duas zonas, a ZHGM1 e a ZHGM2, ambas com valores variáveis de RQD, sendo a primeira a que obteve os valores mais elevados na generalidade dos parâmetros considerados. No final, verificou-se que a aplicação dos índices tem a vantagem de ser um método expedito e simples utilização, embora a sua eficácia poderá ser mais compreensivamente avaliada através de estudos de campo.
The present work intends to deepen and develop the hydrogeomechanical study of fractured rock masses in the former water mines of the Paranhos-Salgueiros springs (Porto Urban area, NW Portugal). Besides contributing to a better hydrogeomechanical knowledge of the site and the influence of groundwater infiltration on these rock masses. A multi-technical approach allowed a comprehensive hydrogeomechanical analysis of the entire rock mass. The application of the Hydro-Potential Value (HP-Value) and Hydraulic Conductivity System (HC-System) hydrogeomechanical indices assisted the evaluation of the rock mass quality and geohydraulic circulation, involving a geological-geotechnical, geomechanical and hydrogeomechanical analysis of the entire tunnel length through data obtained by previous field campaigns, and different groundwater properties such as: flow rate (Q), hydraulic conductivity (K), transmissivity (T) and specific capacity (Q/s). Furthermore, the hydrogeomechanical zoning allowed dividing the massif into two zones, ZHGM1 and ZHGM2, both with variable RQD values, the former being the one that obtained the highest values in most of the parameters considered. In the end, it was verified that the application of the indices has the advantage of being a practical and straightforward method to use. However, its effectiveness could be more comprehensively evaluated through field studies.
The present work intends to deepen and develop the hydrogeomechanical study of fractured rock masses in the former water mines of the Paranhos-Salgueiros springs (Porto Urban area, NW Portugal). Besides contributing to a better hydrogeomechanical knowledge of the site and the influence of groundwater infiltration on these rock masses. A multi-technical approach allowed a comprehensive hydrogeomechanical analysis of the entire rock mass. The application of the Hydro-Potential Value (HP-Value) and Hydraulic Conductivity System (HC-System) hydrogeomechanical indices assisted the evaluation of the rock mass quality and geohydraulic circulation, involving a geological-geotechnical, geomechanical and hydrogeomechanical analysis of the entire tunnel length through data obtained by previous field campaigns, and different groundwater properties such as: flow rate (Q), hydraulic conductivity (K), transmissivity (T) and specific capacity (Q/s). Furthermore, the hydrogeomechanical zoning allowed dividing the massif into two zones, ZHGM1 and ZHGM2, both with variable RQD values, the former being the one that obtained the highest values in most of the parameters considered. In the end, it was verified that the application of the indices has the advantage of being a practical and straightforward method to use. However, its effectiveness could be more comprehensively evaluated through field studies.
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Keywords
Maciços rochosos Cartografia SIG Índices hidrogeomecânicos Hidrogeologia Geomecânica Rock masses GIS mapping Hydrogeomechanical indices Hydrogeology Geomechanics