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Publication
Caracterização de taludes localizados na área de Coimbra
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Authors
Advisor(s)
Abstract(s)
Resumo: Neste trabalho efetua-se a caracterização geomecânica e de
estabilidade de cinco taludes localizados na área urbana de Coimbra e nas
suas imediações. Em dois dos taludes são ocorrentes rochas sedimentares,
enquanto os restantes são constituídos por rochas metamórficas, designadamente filádios e metagrauvaques. Procedeu-se a um levantamento de campo
e à realização de ensaios de caracterização de resistência, massa volúmica,
porosidade aberta e de durabilidade, recorrendo-se à utilização de várias
classificações como a Basic Geotechnical Description (BGD), Rock Mass
Rating (RMR) e Slope Mass Rating (SMR), bem como de programas
informáticos. Os taludes são parcialmente estáveis, de acordo com os
resultados do SMR, com exceção do Talude 2, que foi classificado como
instável. A partir do estudo efetuado procedeu-se a uma avaliação das várias
situações de instabilidade existentes nos taludes considerados, das quais se
destacam as quedas de blocos e as roturas em cunha.
Abstract: The authors carry out a geomechanical characterization and stability study of five slopes located in Coimbra’s urban area. Slope 1 is composed by marly limestone and marls. Slope 2 is essentially made up of sandstones. Slopes 3, 4 and 5 are constituted by phyllites and metagreywackes. A field survey and characterization tests such as strength, density and porosity, and also durability tests were carried out. Rock mass classifications such as Basic Geotechnical Description (BGD), Rock Mass Rating (RMR) and Slope Mass Rating (SMR) were used. Slope assessment through software programs was performed. Density results of the slope rock material were considered medium, except for sandstones of Slope 2, with results varying between from 2.14 g/cm3 to 2.18 g/cm3 which classifies then as low. Open porosity results were considered medium, except for sandstones of Slope 2 and metagreywaques of Slope 5 which present values, respectively, between 20.1% and 20.5% and between 15.5% and 15.9%, and therefore are considered high. Marly limestone of Slope 1 and phyllites and metagreywaques of Slope 4 present a very high durability. Marls of Slope 1 and sandstones of Slope 2 show, respectively, a medium and very low durability. According to SMR results, slopes are classified as partially stable, except for Slope 2, which is considered as unstable. Slope stability assessment revealed that rock falls and wedge failures were the most common slope movements.
Abstract: The authors carry out a geomechanical characterization and stability study of five slopes located in Coimbra’s urban area. Slope 1 is composed by marly limestone and marls. Slope 2 is essentially made up of sandstones. Slopes 3, 4 and 5 are constituted by phyllites and metagreywackes. A field survey and characterization tests such as strength, density and porosity, and also durability tests were carried out. Rock mass classifications such as Basic Geotechnical Description (BGD), Rock Mass Rating (RMR) and Slope Mass Rating (SMR) were used. Slope assessment through software programs was performed. Density results of the slope rock material were considered medium, except for sandstones of Slope 2, with results varying between from 2.14 g/cm3 to 2.18 g/cm3 which classifies then as low. Open porosity results were considered medium, except for sandstones of Slope 2 and metagreywaques of Slope 5 which present values, respectively, between 20.1% and 20.5% and between 15.5% and 15.9%, and therefore are considered high. Marly limestone of Slope 1 and phyllites and metagreywaques of Slope 4 present a very high durability. Marls of Slope 1 and sandstones of Slope 2 show, respectively, a medium and very low durability. According to SMR results, slopes are classified as partially stable, except for Slope 2, which is considered as unstable. Slope stability assessment revealed that rock falls and wedge failures were the most common slope movements.
Description
Keywords
Taludes Estabilidade Filádios Metagrauvaques Coimbra Slopes Stability Phyllites Metagreywaques
Citation
Costa & Andrade 2020, ‘Caracterização de taludes localizados na área de Coimbra’, Comunicações Geológicas, vol. 107, nº 1 (especial), pp. 149-151. https://doi.org/10.34637/ktyq-de34
Publisher
LNEG - Laboratório Nacional de Energia e Geologia