Geological-geotechnical risk mapping of gravitational mass movements in an urban area in Colombo, Brazil

Abstract

This work presents a geological-geotechnical risk map of gravitational mass movements and a susceptibility map to shallow translational slides to Vila Nova community, located in the municipality of Colombo, Brazil. The first map was created through a qualitative mapping methodology and the second one was elaborated using a deterministic method of slope stability. An aerial photogrammetric survey with UAV technology was performed, as well as field reconnaissance, laboratory testing, and geoprocessing techniques. Seven slope failures were identified as well as a range of other evidences of instability associated with the predisposition of the terrain to erosive and gravitational movements linked to human intervention without urban planning and engineering techniques. Moreover, the qualitative and quantitative analyses pointed out that 13% to 9% of the study area, respectively, are in a very high-risk condition for landslides. Thus, the resulting cartographic products are presented as an important technical contribution for landslide risk management as well as land use planning for reducing the geotechnical problems faced on site.

Resistência ao cisalhamento de solos não saturados

“…É interessante ressaltar aqui que tais índices apresentaram variações pequenas, desprezíveis, entre as condições pós-adensamento (sob uma tensão normal líquida de 50 kPa) e ruptura, para todos os níveis de sucção utilizados nos ensaios de cisalhamento direto com sucção controlada. Outras informações sobre esses materiais e técnicas de ensaios podem ser encontradas em Antunes et al (1994) e Carrilo e de . Residual Típico 1.…”

Tropical Soils: Considerations on Occurrence and Characteristics and Studies in Brazil

“…However, in some situations where the size of the work, geological complexity, or even academic studies so require, and other methods are used such as CPT (cone penetration test) or DMT (Dilatometer Marchetti Test) as well as the collection of undeformed samples for laboratório testing (triaxial compression, shear strength, deformation, modulus, and others) as exemplified by the work of [22,30,[44][45][46][47][48][49][50][51][52][53][54][55].…”

Classificação automatizada do relevo da bacia hidrográfica do Córrego Lajeado, Campo Grande, Mato Grosso do Sul

“…Os elementos do relevo variam de características maiores, como planícies e montanhas, a menores, como colinas e escarpas (BLASZCZYNSKI, 1997). Devido à grande variedade de formas de relevo na superfície terrestre, o reconhecimento acurado dessas formas possui uma ampla gama de aplicações, como a classificação do relevo e a compreensão dos processos geomorfológicos ( VAN ASSELEN;SEIJMONSBERGEN, 2006;WHEATON et al, 2015;LIN;CHEN;HE, 2021), o mapeamento litológico (KÜHNI;PFIFFNER, 2001;IWAHASHI et al, 2018), a previsão de propriedades do solo (FLORINSKY et al, 2002;SILVA et al, 2016), a ecologia de paisagens (KUMAR, DEB; DIKAU, 2017), o mapeamento de vegetação (FRANKLIN; MCCULLOUGH; GRAY, 2000), a agricultura de precisão (MACMILLAN et al, 2000), o mapeamento de movimentos gravitacionais de massa (CARRARA et al, 1991;CHUDÝ et al, 2019;PONTES;BOSZCZOWSKI;ERCOLIN FILHO, 2021), o planejamento territorial e a análise ambiental (GARCIA; AUGUSTIN; CASAGRANDE, 2020), dentre outras aplicações.…”