Subsidence Hazard in Limestone Cavities: The Case of “Grutas da Moeda”
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Outros Autores: | , , , |
Tipo de documento: | Artigo de conferência |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10174/27281 |
Resumo: | “Grutas da Moeda” are natural touristic caves, located in the plateau of São Mamede, 5 minutes away from the Sanctuary of Fátima. They have been opened to the public since 1974, and receives about 75,000 visitors per year, from 76 nationalities. They are inserted in the “Maciço Calcário Estremenho”, composed by limestone deposits of the Middle Jurassic (Bathonian), corresponding to the Serra de Aire formation and Upper Jurassic limestone deposits corresponding to the Cabaços and Montejunto formations. The geological risk assessment is fundamental to guarantee the safety of its visitors and workers, therefore it is intended to develop methodologies of geotechnical monitoring in order to collect data to understand the risks that may be associated with this natural cavity and to identify critical areas of collapse. In the caves there are four main alignments (faults / joints), N35ºW, N150ºE, N75ºE and N100ºE, which assume a parallelism with the development of the caves. The trend of the layers in the cave are approximately N30ºE pending 17ºSE. In the year 2015, a geophysical study was carried out in the caves, using the 3D electrical resistivity method and, for one of the areas in particular, the georadar method. The georadar method allowed to map the anomalies corresponding to empty spaces that have been identified with the 3D electrical resistivity technique. This paper presents the results obtained, as well as proposals for geotechnical measures to mitigate the risk of collapse subsidence. |
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Subsidence Hazard in Limestone Cavities: The Case of “Grutas da Moeda”Subsidence riskLimestone cavitiesGeological hazardsGeophysical methodsGeotechnical monitoring“Grutas da Moeda” are natural touristic caves, located in the plateau of São Mamede, 5 minutes away from the Sanctuary of Fátima. They have been opened to the public since 1974, and receives about 75,000 visitors per year, from 76 nationalities. They are inserted in the “Maciço Calcário Estremenho”, composed by limestone deposits of the Middle Jurassic (Bathonian), corresponding to the Serra de Aire formation and Upper Jurassic limestone deposits corresponding to the Cabaços and Montejunto formations. The geological risk assessment is fundamental to guarantee the safety of its visitors and workers, therefore it is intended to develop methodologies of geotechnical monitoring in order to collect data to understand the risks that may be associated with this natural cavity and to identify critical areas of collapse. In the caves there are four main alignments (faults / joints), N35ºW, N150ºE, N75ºE and N100ºE, which assume a parallelism with the development of the caves. The trend of the layers in the cave are approximately N30ºE pending 17ºSE. In the year 2015, a geophysical study was carried out in the caves, using the 3D electrical resistivity method and, for one of the areas in particular, the georadar method. The georadar method allowed to map the anomalies corresponding to empty spaces that have been identified with the 3D electrical resistivity technique. This paper presents the results obtained, as well as proposals for geotechnical measures to mitigate the risk of collapse subsidence.GeoBioTecLREC2020-02-26T12:05:18Z2020-02-262019-05-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjecthttp://hdl.handle.net/10174/27281http://hdl.handle.net/10174/27281engDuarte I. M. R., Pinho A.B., Lopes L., Sábio R., Jorge M. (2019) - Subsidence Hazard in Limestone Cavities: The Case of “Grutas da Moeda”. Proceedings of the 2nd International Workshop on Natural Hazards (NATHAZ'19), Pico Island - Azores 2019.13simnaonaoiduarte@uevora.ptapinho@uevora.ptlopes@uevora.ptricardo.sabio@grutasmoeda.commicael.jorge@grutasmoeda.com405Duarte, Isabel M.R.Pinho, António B.Lopes, LuísSábio, RicardoJorge, Micaelinfo: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:RCAAP2024-01-03T19:22:42Zoai:dspace.uevora.pt:10174/27281Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T01:17:23.621921Repositório 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 |
Subsidence Hazard in Limestone Cavities: The Case of “Grutas da Moeda” |
title |
Subsidence Hazard in Limestone Cavities: The Case of “Grutas da Moeda” |
spellingShingle |
Subsidence Hazard in Limestone Cavities: The Case of “Grutas da Moeda” Duarte, Isabel M.R. Subsidence risk Limestone cavities Geological hazards Geophysical methods Geotechnical monitoring |
title_short |
Subsidence Hazard in Limestone Cavities: The Case of “Grutas da Moeda” |
title_full |
Subsidence Hazard in Limestone Cavities: The Case of “Grutas da Moeda” |
title_fullStr |
Subsidence Hazard in Limestone Cavities: The Case of “Grutas da Moeda” |
title_full_unstemmed |
Subsidence Hazard in Limestone Cavities: The Case of “Grutas da Moeda” |
title_sort |
Subsidence Hazard in Limestone Cavities: The Case of “Grutas da Moeda” |
author |
Duarte, Isabel M.R. |
author_facet |
Duarte, Isabel M.R. Pinho, António B. Lopes, Luís Sábio, Ricardo Jorge, Micael |
author_role |
author |
author2 |
Pinho, António B. Lopes, Luís Sábio, Ricardo Jorge, Micael |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Duarte, Isabel M.R. Pinho, António B. Lopes, Luís Sábio, Ricardo Jorge, Micael |
dc.subject.por.fl_str_mv |
Subsidence risk Limestone cavities Geological hazards Geophysical methods Geotechnical monitoring |
topic |
Subsidence risk Limestone cavities Geological hazards Geophysical methods Geotechnical monitoring |
description |
“Grutas da Moeda” are natural touristic caves, located in the plateau of São Mamede, 5 minutes away from the Sanctuary of Fátima. They have been opened to the public since 1974, and receives about 75,000 visitors per year, from 76 nationalities. They are inserted in the “Maciço Calcário Estremenho”, composed by limestone deposits of the Middle Jurassic (Bathonian), corresponding to the Serra de Aire formation and Upper Jurassic limestone deposits corresponding to the Cabaços and Montejunto formations. The geological risk assessment is fundamental to guarantee the safety of its visitors and workers, therefore it is intended to develop methodologies of geotechnical monitoring in order to collect data to understand the risks that may be associated with this natural cavity and to identify critical areas of collapse. In the caves there are four main alignments (faults / joints), N35ºW, N150ºE, N75ºE and N100ºE, which assume a parallelism with the development of the caves. The trend of the layers in the cave are approximately N30ºE pending 17ºSE. In the year 2015, a geophysical study was carried out in the caves, using the 3D electrical resistivity method and, for one of the areas in particular, the georadar method. The georadar method allowed to map the anomalies corresponding to empty spaces that have been identified with the 3D electrical resistivity technique. This paper presents the results obtained, as well as proposals for geotechnical measures to mitigate the risk of collapse subsidence. |
publishDate |
2019 |
dc.date.none.fl_str_mv |
2019-05-01T00:00:00Z 2020-02-26T12:05:18Z 2020-02-26 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
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conferenceObject |
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publishedVersion |
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http://hdl.handle.net/10174/27281 http://hdl.handle.net/10174/27281 |
url |
http://hdl.handle.net/10174/27281 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Duarte I. M. R., Pinho A.B., Lopes L., Sábio R., Jorge M. (2019) - Subsidence Hazard in Limestone Cavities: The Case of “Grutas da Moeda”. Proceedings of the 2nd International Workshop on Natural Hazards (NATHAZ'19), Pico Island - Azores 2019. 13 sim nao nao iduarte@uevora.pt apinho@uevora.pt lopes@uevora.pt ricardo.sabio@grutasmoeda.com micael.jorge@grutasmoeda.com 405 |
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info:eu-repo/semantics/openAccess |
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openAccess |
dc.publisher.none.fl_str_mv |
LREC |
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LREC |
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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 |
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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) |
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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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