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Caracterização geotécnica do talude norte no Vale da Anta, Cabo Mondego
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Advisor(s)
Abstract(s)
RESUMO: A ocorrência de roturas em taludes (por exemplo, taludes de estradas, frentes de pedreiras e de antigas explorações mineiras), pode causar graves prejuízos económicos e/ou colocar vidas em risco. Assim, é necessária uma intervenção rigorosa e integrada para recuperar taludes abandonados ou instáveis e locais de exploração. Foi estudado um talude rodoviário localizado na zona norte do Cabo Mondego (Vale de Anta) de modo a avaliar possíveis situações de instabilidade e apresentar soluções baseadas na engenharia natural e na restauração geomorfológica. Foi realizada a caracterização geotécnica do talude considerado, que envolveu a realização de ensaios laboratoriais e in situ de determinação das propriedades índice, das propriedades mecânicas e da durabilidade. Também foram utilizados o sistema classificativo Rock Mass Rating (RMR) e o Geological Strength Index (GSI). Na avaliação da estabilidade de taludes utilizaram-se as classificações geomecânicas Slope Mass Rating (SMR) e Q-Slope. A partir da identificação e definição das situações das instabilidades, as quais têm uma maior propensão de ocorrerem na parte do talude mais fragmentado/alterado, apresentaram-se soluções sustentáveis e duradouras.
ABSTRACT: The occurrence of slope failures (e.g., roadway slopes, quarry fronts and abandoned old mining operation), can cause severe economic damage and/or put lives at risk. Thus, a conscious intervention is required the recover abandoned or unstable slopes and exploitation sites. A road slope located in the northern area of Cabo Mondego (Vale de Anta) was studied to evaluate possible instabilities and present solutions based on natural engineering and geomorphological restoration. Geotechnical characterization of the slope considered was carried out, which involved carrying out laboratorial and situ tests of the index values, mechanical properties, and durability. The Rock Mass Rating (RMR) system classification and Geological Strength Index (GSI) were also used. The assessment of slope stability was defined using the Slope Mass Rating (SMR) and Q-Slope geomechanical classifications. From the identification of instabilities, which are more likely to occur in the most fragmented/weathered part of the studied slope, sustainable and long-last solutions were able to be presented.
ABSTRACT: The occurrence of slope failures (e.g., roadway slopes, quarry fronts and abandoned old mining operation), can cause severe economic damage and/or put lives at risk. Thus, a conscious intervention is required the recover abandoned or unstable slopes and exploitation sites. A road slope located in the northern area of Cabo Mondego (Vale de Anta) was studied to evaluate possible instabilities and present solutions based on natural engineering and geomorphological restoration. Geotechnical characterization of the slope considered was carried out, which involved carrying out laboratorial and situ tests of the index values, mechanical properties, and durability. The Rock Mass Rating (RMR) system classification and Geological Strength Index (GSI) were also used. The assessment of slope stability was defined using the Slope Mass Rating (SMR) and Q-Slope geomechanical classifications. From the identification of instabilities, which are more likely to occur in the most fragmented/weathered part of the studied slope, sustainable and long-last solutions were able to be presented.
Description
Keywords
Geologia Engenharia natural Restauração geomorfológica Maciços rochosos Sustentabilidade Geology Natural engineering Geomorphological restoration Rock masses Sustainability
Citation
Pratas-Silva, M., Quinta-Ferreira, M. & Andrade, P.S. (2025). Caracterização geotécnica do talude norte no Vale da Anta, Cabo Mondego. In: Comunicações Geológicas, 2025, vol. 112, Fascículo Especial I, pp. 299-303. https://doi.org/10.34637/3d2x-1w59
Publisher
LNEG - Laboratório Nacional de Energia e Geologia