Influence of anisotropy on the mechanical properties of Baixo Alentejo flysch rocks (Portugal)
Autor(a) principal: | |
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Data de Publicação: | 2015 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10174/17370 |
Resumo: | This paper aims to contribute to the knowledge of the mechanical properties of the shales and greywackes which constitute the flysch-type deposits of the Baixo Alentejo Flysch Group, in the south of Portugal. These formations are flysch-type deposits constituted by sequences of usually thick greywacke beds alternating with thin shale beds, which include sometimes intercalations of conglomerate beds. All the sedimentation of these flysch formations was controlled by tectonics. At the same time, should have occurred along with the first Hercynian deformation phase, a low-grade metamorphic event (chlorite zone), that affected these flysch deposits. This study highlights the influence of anisotropy and heterogeneity of these flysch rocks on their physical and mechanical characteristics. The anisotropy verified in some physical properties and on mechanical properties, due to the foliation makes difficult the sample preparation for the laboratory tests. Besides, it induces a scattering of the properties values measured, as for example, the strength and the deformability. The heterogeneity is related to the main features of these geological formations, which are constituted mostly by thinly stratified greywackes and shale beds, which sometimes may affect the results of the laboratory tests making them less representative. The study is made by using both shales and greywackes that constitute these flysch-type deposits in order to evaluate their geotechnical properties, mainly of the shales. Samples of these two rock materials, are tested accordingly a laboratory testing programme, which includes which included mineralogical analysis (X-ray diffraction), physical tests (bulk density, porosity, and void index) and mechanical tests (uniaxial compression, and deformability tests). |
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Influence of anisotropy on the mechanical properties of Baixo Alentejo flysch rocks (Portugal)ShalesGreywackesFlysch rocks,Mechanical propertiesAnisotropyBaixo Alentejo FlyschThis paper aims to contribute to the knowledge of the mechanical properties of the shales and greywackes which constitute the flysch-type deposits of the Baixo Alentejo Flysch Group, in the south of Portugal. These formations are flysch-type deposits constituted by sequences of usually thick greywacke beds alternating with thin shale beds, which include sometimes intercalations of conglomerate beds. All the sedimentation of these flysch formations was controlled by tectonics. At the same time, should have occurred along with the first Hercynian deformation phase, a low-grade metamorphic event (chlorite zone), that affected these flysch deposits. This study highlights the influence of anisotropy and heterogeneity of these flysch rocks on their physical and mechanical characteristics. The anisotropy verified in some physical properties and on mechanical properties, due to the foliation makes difficult the sample preparation for the laboratory tests. Besides, it induces a scattering of the properties values measured, as for example, the strength and the deformability. The heterogeneity is related to the main features of these geological formations, which are constituted mostly by thinly stratified greywackes and shale beds, which sometimes may affect the results of the laboratory tests making them less representative. The study is made by using both shales and greywackes that constitute these flysch-type deposits in order to evaluate their geotechnical properties, mainly of the shales. Samples of these two rock materials, are tested accordingly a laboratory testing programme, which includes which included mineralogical analysis (X-ray diffraction), physical tests (bulk density, porosity, and void index) and mechanical tests (uniaxial compression, and deformability tests).FCT - UID/GEO/04035/2013Canadian Institute of Mining, Metallurgy and Petroleum2016-02-17T10:34:53Z2016-02-172015-05-10T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/10174/17370http://hdl.handle.net/10174/17370engPinho, A. B., Duarte, I. M. R.; Rosa, F. R. S. & Rodrigues-Carvalho, J. A. (2015) – Influence of anisotropy on the mechanical properties of Baixo Alentejo flysch rocks (Portugal), The 13th ISRM Congress, Montréal, Québec, Canada, 10 - 13 May 10 – 13, 2015. Proceedings of the ISRM 2015 Congress on a USB key, Paper ID 547, ISBN 978-926872-25-4.10978-926872-25-4www.cim.orghttp://www.isrm2015.com/Page/PageContent/CommitteesGeoBioTecapinho@uevora.ptiduarte@uevora.ptfrancisco.ramires@gmail.comrc@fct.unl.ptInnovations in Applied and Theoretical Rock Mechanics405Pinho, António B.Duarte, Isabel M.R.Rosa, Francisco R.S.Rodrigues-Carvalho, José A.info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-01-03T19:04:44Zoai:dspace.uevora.pt:10174/17370Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T01:09:30.795375Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Influence of anisotropy on the mechanical properties of Baixo Alentejo flysch rocks (Portugal) |
title |
Influence of anisotropy on the mechanical properties of Baixo Alentejo flysch rocks (Portugal) |
spellingShingle |
Influence of anisotropy on the mechanical properties of Baixo Alentejo flysch rocks (Portugal) Pinho, António B. Shales Greywackes Flysch rocks, Mechanical properties Anisotropy Baixo Alentejo Flysch |
title_short |
Influence of anisotropy on the mechanical properties of Baixo Alentejo flysch rocks (Portugal) |
title_full |
Influence of anisotropy on the mechanical properties of Baixo Alentejo flysch rocks (Portugal) |
title_fullStr |
Influence of anisotropy on the mechanical properties of Baixo Alentejo flysch rocks (Portugal) |
title_full_unstemmed |
Influence of anisotropy on the mechanical properties of Baixo Alentejo flysch rocks (Portugal) |
title_sort |
Influence of anisotropy on the mechanical properties of Baixo Alentejo flysch rocks (Portugal) |
author |
Pinho, António B. |
author_facet |
Pinho, António B. Duarte, Isabel M.R. Rosa, Francisco R.S. Rodrigues-Carvalho, José A. |
author_role |
author |
author2 |
Duarte, Isabel M.R. Rosa, Francisco R.S. Rodrigues-Carvalho, José A. |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Pinho, António B. Duarte, Isabel M.R. Rosa, Francisco R.S. Rodrigues-Carvalho, José A. |
dc.subject.por.fl_str_mv |
Shales Greywackes Flysch rocks, Mechanical properties Anisotropy Baixo Alentejo Flysch |
topic |
Shales Greywackes Flysch rocks, Mechanical properties Anisotropy Baixo Alentejo Flysch |
description |
This paper aims to contribute to the knowledge of the mechanical properties of the shales and greywackes which constitute the flysch-type deposits of the Baixo Alentejo Flysch Group, in the south of Portugal. These formations are flysch-type deposits constituted by sequences of usually thick greywacke beds alternating with thin shale beds, which include sometimes intercalations of conglomerate beds. All the sedimentation of these flysch formations was controlled by tectonics. At the same time, should have occurred along with the first Hercynian deformation phase, a low-grade metamorphic event (chlorite zone), that affected these flysch deposits. This study highlights the influence of anisotropy and heterogeneity of these flysch rocks on their physical and mechanical characteristics. The anisotropy verified in some physical properties and on mechanical properties, due to the foliation makes difficult the sample preparation for the laboratory tests. Besides, it induces a scattering of the properties values measured, as for example, the strength and the deformability. The heterogeneity is related to the main features of these geological formations, which are constituted mostly by thinly stratified greywackes and shale beds, which sometimes may affect the results of the laboratory tests making them less representative. The study is made by using both shales and greywackes that constitute these flysch-type deposits in order to evaluate their geotechnical properties, mainly of the shales. Samples of these two rock materials, are tested accordingly a laboratory testing programme, which includes which included mineralogical analysis (X-ray diffraction), physical tests (bulk density, porosity, and void index) and mechanical tests (uniaxial compression, and deformability tests). |
publishDate |
2015 |
dc.date.none.fl_str_mv |
2015-05-10T00:00:00Z 2016-02-17T10:34:53Z 2016-02-17 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10174/17370 http://hdl.handle.net/10174/17370 |
url |
http://hdl.handle.net/10174/17370 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Pinho, A. B., Duarte, I. M. R.; Rosa, F. R. S. & Rodrigues-Carvalho, J. A. (2015) – Influence of anisotropy on the mechanical properties of Baixo Alentejo flysch rocks (Portugal), The 13th ISRM Congress, Montréal, Québec, Canada, 10 - 13 May 10 – 13, 2015. Proceedings of the ISRM 2015 Congress on a USB key, Paper ID 547, ISBN 978-926872-25-4. 10 978-926872-25-4 www.cim.org http://www.isrm2015.com/Page/PageContent/Committees GeoBioTec apinho@uevora.pt iduarte@uevora.pt francisco.ramires@gmail.com rc@fct.unl.pt Innovations in Applied and Theoretical Rock Mechanics 405 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
Canadian Institute of Mining, Metallurgy and Petroleum |
publisher.none.fl_str_mv |
Canadian Institute of Mining, Metallurgy and Petroleum |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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1799136577276870656 |