Geomechanical parameters in the active zone of an unsaturated tropical soil site via laboratory tests

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dc.contributor.authorFernandes, Jeferson Brito [UNESP]
dc.contributor.authorSaab, Alfredo Lopes [UNESP]
dc.contributor.authorRocha, Breno Padovezi
dc.contributor.authorRodrigues, Roger Augusto [UNESP]
dc.contributor.authorLodi, Paulo César [UNESP]
dc.contributor.authorGiacheti, Heraldo Luiz [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.contributor.institutionInstituto Federal de São Paulo
dc.date.accessioned2023-07-29T15:14:32Z
dc.date.available2023-07-29T15:14:32Z
dc.date.issued2022-10-01
dc.description.abstractThe seasonal variability of geotechnical parameters in the unsaturated zone is typically neglected in the design of geotechnical works. In most of the geotechnical projects the parameters are determined only for the saturated condition. Although it is known that this condition is the most critical to soil strength and deformability, this conservative approach may neglect a possible important contribution of the unsaturated condition, resulting in an increase in the cost of the geotechnical solution. This paper presents and discusses the site characterization of the active zone of an unsaturated sandy soil profile under different suction conditions. Laboratory tests with controlled suction (retention curves, triaxial compression with bender elements and oedometer tests) were carried out on undisturbed samples collected from 1.0 to 5.0 m depth. The results show that strength and deformability parameters are strongly affected by soil suction and are less influenced by confinement stress up to 5.0 m depth. All the investigated subsoil profile shows a collapsible behavior, more pronounced closer to the ground surface and under the effect of higher suction values. The findings highlight the importance of incorporating the suction influence in the site investigation, parameter determination, and geotechnical design for more economical, reliable, and environmentally sustainable solutions.en
dc.description.affiliationUniversidade Estadual Paulista “Júlio de Mesquita Filho” Faculdade de Engenharia Departamento de Engenharia Civil e Ambiental, SP
dc.description.affiliationInstituto Federal de São Paulo, SP
dc.description.affiliationUnespUniversidade Estadual Paulista “Júlio de Mesquita Filho” Faculdade de Engenharia Departamento de Engenharia Civil e Ambiental, SP
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipIdFAPESP: 2017/23174-5
dc.description.sponsorshipIdCNPq: 436478/2018-8
dc.identifierhttp://dx.doi.org/10.28927/SR.2022.000422
dc.identifier.citationSoils and Rocks, v. 45, n. 4, 2022.
dc.identifier.doi10.28927/SR.2022.000422
dc.identifier.issn2675-5475
dc.identifier.issn1980-9743
dc.identifier.scopus2-s2.0-85141936637
dc.identifier.urihttp://hdl.handle.net/11449/249379
dc.language.isoeng
dc.relation.ispartofSoils and Rocks
dc.sourceScopus
dc.subjectBender elements
dc.subjectOedometer test
dc.subjectSuction
dc.subjectTriaxial compression test
dc.subjectUnsaturated soil
dc.titleGeomechanical parameters in the active zone of an unsaturated tropical soil site via laboratory testsen
dc.typeArtigo

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Artigos - Engenharia Civil e Ambiental - FEB