GEOTECHNICAL PROPERTIES OF THE BARREIRAS FORMATION SEDIMENTS IN THE CLIFFS OF BARRA DE TABATINGA, EASTERN COAST OF RIO GRANDE DO NORTE / BRAZIL
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Holos |
Texto Completo: | http://www2.ifrn.edu.br/ojs/index.php/HOLOS/article/view/9560 |
Resumo: | In the state of Rio Grande do Norte exists outcrops of cliffs that belongs to the Barreiras Formation, which cities and infrastructure works are developed on. In this region, mass movements are reported in relevant proportions, especially in rainy season. The aims of this work were to study the geotechnical properties of the Barreiras Formation soils that make up the Barra de Tabatinga / RN beach cliff and to evaluate the stability of the cliff from the deterministic point of view. The studied cliff was divided into three predominant soils, which are located at the base (AM-01), middle (AM-02) and top (AM-03) layers. In these soils, were performed characterization tests (geotechnical, chemical, and mineralogical), tests to determine the soil-water retention curve, permeability tests, triaxial and diametral compression tests under saturated and unsaturated conditions. Samples AM-01 and AM-02 showed bimodal soil-water retention curves, unlike the top sample, which presented unimodal fit. In addition, all of them presented close to zero cohesion and angle of friction around 30° in the saturated condition. However, when unsaturated, the strength parameters increased considerably, especially the cohesion. the tensile strength decreased with the increase in the degree of saturation reaching negligible values in all soils when saturated. The upper soil is the most permeable of the studied soils, presenting a permeability coefficient compatible with pure sand. |
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GEOTECHNICAL PROPERTIES OF THE BARREIRAS FORMATION SEDIMENTS IN THE CLIFFS OF BARRA DE TABATINGA, EASTERN COAST OF RIO GRANDE DO NORTE / BRAZILPROPRIEDADES GEOTÉCNICAS DE SEDIMENTOS DA FORMAÇÃO BARREIRAS NAS FALÉSIAS DE BARRA DE TABATINGA LITORAL ORIENTAL DO RIO GRANDE DO NORTE/BRASILBarreiras FormationGeotechnical propertiesCliffUnsaturated soil.Formação BarreirasPropriedades geotécnicasFalésiasSolo não saturado.In the state of Rio Grande do Norte exists outcrops of cliffs that belongs to the Barreiras Formation, which cities and infrastructure works are developed on. In this region, mass movements are reported in relevant proportions, especially in rainy season. The aims of this work were to study the geotechnical properties of the Barreiras Formation soils that make up the Barra de Tabatinga / RN beach cliff and to evaluate the stability of the cliff from the deterministic point of view. The studied cliff was divided into three predominant soils, which are located at the base (AM-01), middle (AM-02) and top (AM-03) layers. In these soils, were performed characterization tests (geotechnical, chemical, and mineralogical), tests to determine the soil-water retention curve, permeability tests, triaxial and diametral compression tests under saturated and unsaturated conditions. Samples AM-01 and AM-02 showed bimodal soil-water retention curves, unlike the top sample, which presented unimodal fit. In addition, all of them presented close to zero cohesion and angle of friction around 30° in the saturated condition. However, when unsaturated, the strength parameters increased considerably, especially the cohesion. the tensile strength decreased with the increase in the degree of saturation reaching negligible values in all soils when saturated. The upper soil is the most permeable of the studied soils, presenting a permeability coefficient compatible with pure sand.No Estado do Rio Grande do Norte encontram-se falésias constituídas por sedimentos da Formação Barreiras sobre os quais se desenvolvem cidades e obras de infraestrutura. Nesta região são relatados, movimentos de massa, em proporções relevantes, principalmente em períodos de chuva. O objetivo deste trabalho foi estudar as propriedades geotécnicas dos solos da Formação Barreiras que compõem a falésia da praia da Barra de Tabatinga/RN. A falésia estudada foi dividida em três solos predominantes, os quais estão localizados na camada de base (AM-01), meio (AM-02) e topo (AM-03). Nesses solos, foram realizados ensaios de caracterização (geotécnica, química e mineralógica), ensaios para determinação da curva de retenção, ensaios de permeabilidade, compressão triaxial e diametral nas condições saturada e não saturada. As amostras AM-01 e AM-02 apresentaram curvas de retenção bimodais, diferentemente da amostra do topo, que apresentou formato unimodal. Além disso, todas elas apresentaram coesão próxima de zero e ângulo de atrito em torno de 30° na condição saturada. No entanto, quando não saturadas, os parâmetros de resistência aumentaram consideravelmente, apresentando diferenças significativas entre as amostras. A resistência a tração diminuiu com o aumento do grau de saturação chegando a atingir valores desprezíveis em todos os solos quando saturadas. O solo do topo é o mais permeável dos solos estudados, apresentando coeficiente de permeabilidade compatível com uma areia pura.Instituto Federal de Educação, Ciência e Tecnologia do Rio Grande do Norte2020-12-31info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://www2.ifrn.edu.br/ojs/index.php/HOLOS/article/view/956010.15628/holos.2020.9560HOLOS; v. 7 (2020); 1-201807-1600reponame:Holosinstname:Instituto Federal do Rio Grande do Norte (IFRN)instacron:IFRNporhttp://www2.ifrn.edu.br/ojs/index.php/HOLOS/article/view/9560/pdfCopyright (c) 2020 HOLOSinfo:eu-repo/semantics/openAccessmorais, Anderson Dantasdos Santos JR, Olavo Franciscode Freitas Neto, Osvaldo2022-05-01T19:15:07Zoai:holos.ifrn.edu.br:article/9560Revistahttp://www2.ifrn.edu.br/ojs/index.php/HOLOSPUBhttp://www2.ifrn.edu.br/ojs/index.php/HOLOS/oaiholos@ifrn.edu.br||jyp.leite@ifrn.edu.br||propi@ifrn.edu.br1807-16001518-1634opendoar:2022-05-01T19:15:07Holos - Instituto Federal do Rio Grande do Norte (IFRN)false |
dc.title.none.fl_str_mv |
GEOTECHNICAL PROPERTIES OF THE BARREIRAS FORMATION SEDIMENTS IN THE CLIFFS OF BARRA DE TABATINGA, EASTERN COAST OF RIO GRANDE DO NORTE / BRAZIL PROPRIEDADES GEOTÉCNICAS DE SEDIMENTOS DA FORMAÇÃO BARREIRAS NAS FALÉSIAS DE BARRA DE TABATINGA LITORAL ORIENTAL DO RIO GRANDE DO NORTE/BRASIL |
title |
GEOTECHNICAL PROPERTIES OF THE BARREIRAS FORMATION SEDIMENTS IN THE CLIFFS OF BARRA DE TABATINGA, EASTERN COAST OF RIO GRANDE DO NORTE / BRAZIL |
spellingShingle |
GEOTECHNICAL PROPERTIES OF THE BARREIRAS FORMATION SEDIMENTS IN THE CLIFFS OF BARRA DE TABATINGA, EASTERN COAST OF RIO GRANDE DO NORTE / BRAZIL morais, Anderson Dantas Barreiras Formation Geotechnical properties Cliff Unsaturated soil. Formação Barreiras Propriedades geotécnicas Falésias Solo não saturado. |
title_short |
GEOTECHNICAL PROPERTIES OF THE BARREIRAS FORMATION SEDIMENTS IN THE CLIFFS OF BARRA DE TABATINGA, EASTERN COAST OF RIO GRANDE DO NORTE / BRAZIL |
title_full |
GEOTECHNICAL PROPERTIES OF THE BARREIRAS FORMATION SEDIMENTS IN THE CLIFFS OF BARRA DE TABATINGA, EASTERN COAST OF RIO GRANDE DO NORTE / BRAZIL |
title_fullStr |
GEOTECHNICAL PROPERTIES OF THE BARREIRAS FORMATION SEDIMENTS IN THE CLIFFS OF BARRA DE TABATINGA, EASTERN COAST OF RIO GRANDE DO NORTE / BRAZIL |
title_full_unstemmed |
GEOTECHNICAL PROPERTIES OF THE BARREIRAS FORMATION SEDIMENTS IN THE CLIFFS OF BARRA DE TABATINGA, EASTERN COAST OF RIO GRANDE DO NORTE / BRAZIL |
title_sort |
GEOTECHNICAL PROPERTIES OF THE BARREIRAS FORMATION SEDIMENTS IN THE CLIFFS OF BARRA DE TABATINGA, EASTERN COAST OF RIO GRANDE DO NORTE / BRAZIL |
author |
morais, Anderson Dantas |
author_facet |
morais, Anderson Dantas dos Santos JR, Olavo Francisco de Freitas Neto, Osvaldo |
author_role |
author |
author2 |
dos Santos JR, Olavo Francisco de Freitas Neto, Osvaldo |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
morais, Anderson Dantas dos Santos JR, Olavo Francisco de Freitas Neto, Osvaldo |
dc.subject.por.fl_str_mv |
Barreiras Formation Geotechnical properties Cliff Unsaturated soil. Formação Barreiras Propriedades geotécnicas Falésias Solo não saturado. |
topic |
Barreiras Formation Geotechnical properties Cliff Unsaturated soil. Formação Barreiras Propriedades geotécnicas Falésias Solo não saturado. |
description |
In the state of Rio Grande do Norte exists outcrops of cliffs that belongs to the Barreiras Formation, which cities and infrastructure works are developed on. In this region, mass movements are reported in relevant proportions, especially in rainy season. The aims of this work were to study the geotechnical properties of the Barreiras Formation soils that make up the Barra de Tabatinga / RN beach cliff and to evaluate the stability of the cliff from the deterministic point of view. The studied cliff was divided into three predominant soils, which are located at the base (AM-01), middle (AM-02) and top (AM-03) layers. In these soils, were performed characterization tests (geotechnical, chemical, and mineralogical), tests to determine the soil-water retention curve, permeability tests, triaxial and diametral compression tests under saturated and unsaturated conditions. Samples AM-01 and AM-02 showed bimodal soil-water retention curves, unlike the top sample, which presented unimodal fit. In addition, all of them presented close to zero cohesion and angle of friction around 30° in the saturated condition. However, when unsaturated, the strength parameters increased considerably, especially the cohesion. the tensile strength decreased with the increase in the degree of saturation reaching negligible values in all soils when saturated. The upper soil is the most permeable of the studied soils, presenting a permeability coefficient compatible with pure sand. |
publishDate |
2020 |
dc.date.none.fl_str_mv |
2020-12-31 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://www2.ifrn.edu.br/ojs/index.php/HOLOS/article/view/9560 10.15628/holos.2020.9560 |
url |
http://www2.ifrn.edu.br/ojs/index.php/HOLOS/article/view/9560 |
identifier_str_mv |
10.15628/holos.2020.9560 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
http://www2.ifrn.edu.br/ojs/index.php/HOLOS/article/view/9560/pdf |
dc.rights.driver.fl_str_mv |
Copyright (c) 2020 HOLOS info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
Copyright (c) 2020 HOLOS |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Instituto Federal de Educação, Ciência e Tecnologia do Rio Grande do Norte |
publisher.none.fl_str_mv |
Instituto Federal de Educação, Ciência e Tecnologia do Rio Grande do Norte |
dc.source.none.fl_str_mv |
HOLOS; v. 7 (2020); 1-20 1807-1600 reponame:Holos instname:Instituto Federal do Rio Grande do Norte (IFRN) instacron:IFRN |
instname_str |
Instituto Federal do Rio Grande do Norte (IFRN) |
instacron_str |
IFRN |
institution |
IFRN |
reponame_str |
Holos |
collection |
Holos |
repository.name.fl_str_mv |
Holos - Instituto Federal do Rio Grande do Norte (IFRN) |
repository.mail.fl_str_mv |
holos@ifrn.edu.br||jyp.leite@ifrn.edu.br||propi@ifrn.edu.br |
_version_ |
1798951625148071936 |