Title:	Caracterização geotécnica e análise de maciços constituídos por solos residuais de filito no quadrilátero ferrífero.
Authors:	Pontes, Lucas André de Arede
Orientador(es)::	Silva, Rafael Cerqueira
Assunto::	Quadrilátero ferrífero Filito Anisotropia Rebaixamento do nível de água
Issue Date:	11-Jun-2026
Data de defesa::	16-Dec-2025
Citation:	PONTES, Lucas André de Arede. Caracterização geotécnica e análise de maciços constituídos por solos residuais de filito no quadrilátero ferrífero. 2025. 205 f., il. Dissertação (Mestrado em Geotecnia) — Universidade de Brasília, Brasília, 2025.
Abstract:	The Quadrilátero Ferrífero is Brazil’s main mineral province and hosts infrastructure works essential to the national economy, such as railways, highways, and dams. These interventions take place in geotechnically complex terrains where young residual soils derived from phyllite are common. These metasedimentary and strongly anisotropic materials exhibit mechanical and hydraulic behavior controlled by the orientation of relict foliation, which directly influences the stability of soil masses, slopes, and retaining structures. Understanding such structural controls is fundamental to reduce design uncertainties and improve engineering practices in regions marked by intense tectonic and deformational activity. This dissertation investigates the geotechnical behavior of residual phyllite soils, focusing on the effects of structural anisotropy on shear strength and permeability. The research compiles and discusses laboratory and field investigations, including physical characterization, permeability tests, oriented direct shear, triaxial compression, dispersivity tests, and chemical analysis by X-ray fluorescence (XRF). Back-analyses of failure events and geotechnical instrumentation programs involving inclinometers, piezometers, and water level measurements were also considered. The interpretation of direct shear data, supported by statistical analyses, allowed the identification of geomechanical differences between specimen saturation conditions, as well as variability associated with material anisotropy. Higher shear rates led to greater mobilization of shear strength, highlighting the influence of strain rate on the behavior of residual phyllite soils. It was further verified that, although triaxial tests are widely employed, oriented direct shear performed parallel to foliation planes reproduces the most critical strength conditions. The study contributes to advancing the understanding of residual soils derived from phyllite and proposes an integrated approach combining laboratory testing, structural observations, back analyses, and in situ monitoring.
metadata.dc.description.unidade:	Faculdade de Tecnologia (FT) Departamento de Engenharia Civil e Ambiental (FT ENC)
Description:	Dissertação (mestrado) — Universidade de Brasília, Faculdade de Tecnologia, Departamento de Engenharia Civil e Ambiental, 2025.
metadata.dc.description.ppg:	Programa de Pós-Graduação em Geotecnia
Licença::	A concessão da licença deste item refere-se ao termo de autorização impresso assinado pelo autor com as seguintes condições: Na qualidade de titular dos direitos de autor da publicação, autorizo a Universidade de Brasília e o IBICT a disponibilizar por meio dos sites www.unb.br, www.ibict.br, www.ndltd.org sem ressarcimento dos direitos autorais, de acordo com a Lei nº 9610/98, o texto integral da obra supracitada, conforme permissões assinaladas, para fins de leitura, impressão e/ou download, a título de divulgação da produção científica brasileira, a partir desta data.
Agência financiadora:	Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Appears in Collections:	Teses, dissertações e produtos pós-doutorado

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