Application of multichannel analysis of surface waves method (MASW) in an area susceptible to landslide at Ubatuba city, Brazil

Detalhes bibliográficos
Autor(a) principal: Lima Júnior, Sergio Bezerra
Data de Publicação: 2012
Outros Autores: Prado, Renato Luiz, Mendes, Rodolfo Moreda
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da Universidade Federal do Ceará (UFC)
Texto Completo: http://www.repositorio.ufc.br/handle/riufc/63653
Resumo: This paper presents results from the MASW method (Multichannel Analysis of Surface Waves) in a hill side area of unsaturated soils in the Ubatuba City,Brazil, a site where numerous mass movements have occurred. It discusses the influence of some acquisition parameters, such as, the natural frequency of geophones and minimum and maximum offsets in dispersion image results and does a comparative analysis of the results obtained in repeated tests carried out in the same place, under the same conditions, during the dry and rainy seasons. The comparative analysis for the inversion results in different periods showed that the values of S-wave velocity during the dry season were higher than those for the rainy season; these variations were attributed to the higher cohesion of the soil structure in the dry season. The final 1D velocity profile model with depth was consistent with the results of other geophysical and geotechnical investigations made. Although additional in situ and laboratory geotechnical tests, are necessary (to obtain soil parameters such as hydraulic conductivity, moisture content, soil suction, for example), for a complete characterization of the geotechnical properties of the investigated soil, the result shows that it is possible to use empirical correlations between the Vs profile, from the MASW method, and soil stiffness parameters in order to monitor areas susceptible to landslide.
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spelling Application of multichannel analysis of surface waves method (MASW) in an area susceptible to landslide at Ubatuba city, BrazilSoilSoil - AnalysisMethod - MASWSoloAnalise -soloMétodo - MASWThis paper presents results from the MASW method (Multichannel Analysis of Surface Waves) in a hill side area of unsaturated soils in the Ubatuba City,Brazil, a site where numerous mass movements have occurred. It discusses the influence of some acquisition parameters, such as, the natural frequency of geophones and minimum and maximum offsets in dispersion image results and does a comparative analysis of the results obtained in repeated tests carried out in the same place, under the same conditions, during the dry and rainy seasons. The comparative analysis for the inversion results in different periods showed that the values of S-wave velocity during the dry season were higher than those for the rainy season; these variations were attributed to the higher cohesion of the soil structure in the dry season. The final 1D velocity profile model with depth was consistent with the results of other geophysical and geotechnical investigations made. Although additional in situ and laboratory geotechnical tests, are necessary (to obtain soil parameters such as hydraulic conductivity, moisture content, soil suction, for example), for a complete characterization of the geotechnical properties of the investigated soil, the result shows that it is possible to use empirical correlations between the Vs profile, from the MASW method, and soil stiffness parameters in order to monitor areas susceptible to landslide.Este trabalho apresenta resultados da aplicação do método MASW ( Multichannel Analysis of Surface Waves) em uma área de encosta com solos nãosaturados, no município de Ubatuba, Estado de São Paulo, onde ocorrem numerosos movimentos de massa. Discute a influencia de alguns dos parâmetros de aquisição (frequência dos geofones e afastamentos), no resultado da imagem de dispersão,em de fazer uma analise comparativa dos resultados obtidos em ensaios repetidos no mesmo local e sob as mesmas condições, em dois períodos do ano (seco e úmido). A análise comparativa entre os resultados das inversões nos distintos períodos mostrou que os valores de velocidade da onda S (Vs) do período mais seco foram superiores aos do período das chuvas; variações atribui ˜ ´ıdas ao aumento das tensões capilares e da coesão entre os grãos da estrutura do solo. O modelo final 1D de velocidades com a profundidade ˜ e coerente com os obtidos em outras investigações geofísicas e geotécnicas feitas no local. Embora sejam necessários ensaios geotécnicos adicionais, "in situ" e em laboratório (para obtenção de parâmetros como condutividade hidráulica, teor de umidade, medição da sucção, por exemplo), para uma completa caracterização das propriedades geotécnicas do maciço investigado, o resultado apresentado mostra ser possível usar correlações empíricas sítios dependentes entre Vs, obtidos através do método MASW, e parâmetros de resistência do solo para subsidiar projetos de monitoramento de áreas de instabilidade.Revista Brasileira de Geofísica2022-01-24T13:50:57Z2022-01-24T13:50:57Z2012info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfLIMA JUNIOR, Sergio Bezerra; PRADO, Renato Luiz; MENDES, Rodolfo Moreda. Application of multichannel analysis of surface waves method (MASW) in an area susceptible to landslide at Ubatuba city, Brazil. Revista Brasileira de Geofísica, Rio de Janeiro, v. 30, n. 2, p. 213-224, 2012.0102-261xhttp://www.repositorio.ufc.br/handle/riufc/63653Lima Júnior, Sergio BezerraPrado, Renato LuizMendes, Rodolfo Moredaengreponame:Repositório Institucional da Universidade Federal do Ceará (UFC)instname:Universidade Federal do Ceará (UFC)instacron:UFCinfo:eu-repo/semantics/openAccess2022-01-24T13:50:57Zoai:repositorio.ufc.br:riufc/63653Repositório InstitucionalPUBhttp://www.repositorio.ufc.br/ri-oai/requestbu@ufc.br || repositorio@ufc.bropendoar:2024-09-11T18:16:45.761820Repositório Institucional da Universidade Federal do Ceará (UFC) - Universidade Federal do Ceará (UFC)false
dc.title.none.fl_str_mv Application of multichannel analysis of surface waves method (MASW) in an area susceptible to landslide at Ubatuba city, Brazil
title Application of multichannel analysis of surface waves method (MASW) in an area susceptible to landslide at Ubatuba city, Brazil
spellingShingle Application of multichannel analysis of surface waves method (MASW) in an area susceptible to landslide at Ubatuba city, Brazil
Lima Júnior, Sergio Bezerra
Soil
Soil - Analysis
Method - MASW
Solo
Analise -solo
Método - MASW
title_short Application of multichannel analysis of surface waves method (MASW) in an area susceptible to landslide at Ubatuba city, Brazil
title_full Application of multichannel analysis of surface waves method (MASW) in an area susceptible to landslide at Ubatuba city, Brazil
title_fullStr Application of multichannel analysis of surface waves method (MASW) in an area susceptible to landslide at Ubatuba city, Brazil
title_full_unstemmed Application of multichannel analysis of surface waves method (MASW) in an area susceptible to landslide at Ubatuba city, Brazil
title_sort Application of multichannel analysis of surface waves method (MASW) in an area susceptible to landslide at Ubatuba city, Brazil
author Lima Júnior, Sergio Bezerra
author_facet Lima Júnior, Sergio Bezerra
Prado, Renato Luiz
Mendes, Rodolfo Moreda
author_role author
author2 Prado, Renato Luiz
Mendes, Rodolfo Moreda
author2_role author
author
dc.contributor.author.fl_str_mv Lima Júnior, Sergio Bezerra
Prado, Renato Luiz
Mendes, Rodolfo Moreda
dc.subject.por.fl_str_mv Soil
Soil - Analysis
Method - MASW
Solo
Analise -solo
Método - MASW
topic Soil
Soil - Analysis
Method - MASW
Solo
Analise -solo
Método - MASW
description This paper presents results from the MASW method (Multichannel Analysis of Surface Waves) in a hill side area of unsaturated soils in the Ubatuba City,Brazil, a site where numerous mass movements have occurred. It discusses the influence of some acquisition parameters, such as, the natural frequency of geophones and minimum and maximum offsets in dispersion image results and does a comparative analysis of the results obtained in repeated tests carried out in the same place, under the same conditions, during the dry and rainy seasons. The comparative analysis for the inversion results in different periods showed that the values of S-wave velocity during the dry season were higher than those for the rainy season; these variations were attributed to the higher cohesion of the soil structure in the dry season. The final 1D velocity profile model with depth was consistent with the results of other geophysical and geotechnical investigations made. Although additional in situ and laboratory geotechnical tests, are necessary (to obtain soil parameters such as hydraulic conductivity, moisture content, soil suction, for example), for a complete characterization of the geotechnical properties of the investigated soil, the result shows that it is possible to use empirical correlations between the Vs profile, from the MASW method, and soil stiffness parameters in order to monitor areas susceptible to landslide.
publishDate 2012
dc.date.none.fl_str_mv 2012
2022-01-24T13:50:57Z
2022-01-24T13:50:57Z
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 LIMA JUNIOR, Sergio Bezerra; PRADO, Renato Luiz; MENDES, Rodolfo Moreda. Application of multichannel analysis of surface waves method (MASW) in an area susceptible to landslide at Ubatuba city, Brazil. Revista Brasileira de Geofísica, Rio de Janeiro, v. 30, n. 2, p. 213-224, 2012.
0102-261x
http://www.repositorio.ufc.br/handle/riufc/63653
identifier_str_mv LIMA JUNIOR, Sergio Bezerra; PRADO, Renato Luiz; MENDES, Rodolfo Moreda. Application of multichannel analysis of surface waves method (MASW) in an area susceptible to landslide at Ubatuba city, Brazil. Revista Brasileira de Geofísica, Rio de Janeiro, v. 30, n. 2, p. 213-224, 2012.
0102-261x
url http://www.repositorio.ufc.br/handle/riufc/63653
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Revista Brasileira de Geofísica
publisher.none.fl_str_mv Revista Brasileira de Geofísica
dc.source.none.fl_str_mv reponame:Repositório Institucional da Universidade Federal do Ceará (UFC)
instname:Universidade Federal do Ceará (UFC)
instacron:UFC
instname_str Universidade Federal do Ceará (UFC)
instacron_str UFC
institution UFC
reponame_str Repositório Institucional da Universidade Federal do Ceará (UFC)
collection Repositório Institucional da Universidade Federal do Ceará (UFC)
repository.name.fl_str_mv Repositório Institucional da Universidade Federal do Ceará (UFC) - Universidade Federal do Ceará (UFC)
repository.mail.fl_str_mv bu@ufc.br || repositorio@ufc.br
_version_ 1813028735308267520

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