Detecção de cavidades em arenitos utilizando gravimetria, eletrorresistividade e GPR

Dourado, João Carlos; Filho, Walter Malagutti; Braga, António; Nava, Noedir

doi:10.1590/s0102-261x2001000100002

Cited by 12 publications

(7 citation statements)

References 3 publications

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“…Geophysics is an indirect, non-invasive method of investigation, well established in mineral survey, environmental and geotechnical studies. This method has been applied in many studies of geotechnical risks and the results are commonly satisfactory (Dourado et al, 2001;Ahmed et al, 2003;Silva Junior et al, 2006;Lazzari et al, 2010;Pánek et al, 2010;Martinez Pagán et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Gully Cavity Identification Through Electrical Resistivity Tomography

Carrazza¹,

Moreira²,

Helene³

2016

Rev. Bras. Geof.

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ABSTRACT. Chaotic urban expansion often leads to hazardous environmental consequences. The absense of rainwater outflow management, coupled with low cohesion in some terrains is a geotechnical threat for the population since it may lead to gully formation...Keywords: piping, geophysics, electrical resistivity, electrical resistivity tomography. RESUMO. A expansão urbana desordenada pode gerar graves consequências ao ambiente. A falta de planejamento no escoamento de águas pluviais, aliado à baixa coesão de alguns terrenos pode proporcionar o surgimento de voçorocas,Palavras-chave: piping, geofísica, resistividade elétrica, tomografia elétrica.

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Section: Introductionmentioning

confidence: 99%

Gully Cavity Identification Through Electrical Resistivity Tomography

Carrazza¹,

Moreira²,

Helene³

2016

Rev. Bras. Geof.

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“…Constataram que as anomalias de SP e de resisitividade poderiam refletir zonas de maior percolação deágua, associadas a fraturamentos e feições cársticas, ou mesmo maiores espessuras de solos coluvionares e aluvionares. Dourado et al (2001) aplicaram o método gravimétrico em conjunto com ensaios de eletrorresistividade e GPR (Ground Penetrating Radar) para a detecção de cavidades em arenitos na região de Descalvado, estado de São Paulo. Os resultados mostraram-se coerentes, pois onde a gravimetria indicou ausência de massa, o caminhamento elétrico detectou um incremento de resistividade elétrica.…”

Section: Métodos Geofísicos Aplicadosà Identificação De Feições Cárstunclassified

Aplicação dos métodos gravimétrico e eletroresistivimétrico-IP em área de risco geotécnico do sistema aqüífero cárstico em Almirante Tamandaré-PR

Silva¹,

Ferreira²,

Stevanato³

2006

Rev. Bras. Geof.

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ABSTRACT. The application of the gravity, resistivity and induced polarization (IP) methods on the geophysical interpretation in karst terrains is a useful tool, considering its capability in identifying and dimensioning existing dissolution features such as fractures, voids or cavities, filled or not by water or sediment in the subsurface. The bi-dimensional and three-dimensional modeling of these bodies makes possible an indirect evaluation of the geotechnical-structural context of the terrain under study. The aim of this work consisted on the identification of these features and the evaluation of their shape and dimensions over an area that suffered ground collapses, compromising buildings in this region. Qualitatively, the results indicated the existence of regions where there is water flow or very saturated soil, following the analysis of the correlation among the responses of the employed methods. In a quantitative point of view, gravity and resistivity-IP inversion methods were used. These methods allowed the estimation of the shape and the depth of the anomalies causative bodies. Finally, the results showed that the employed methods can be useful in the investigation of karst features, pointing out fragile regions which can compromise the implantation of physical structures over the surface.Keywords: gravimetry, resistivity/IP, karst aquifer system, geotechnical risk. RESUMO. A aplicação dos métodos gravimétrico, eletroresistivimétrico e da polarização induzida (IP), na interpretação geofísico-geológica de terrenos cársticos, temse reveladoútil, considerando a possibilidade de identificação e dimensionamento de feições de dissolução tais como fraturas, vazios ou cavidades, preenchidas ou não porágua ou sedimentos, sob a superfície do terreno. As modelagens bidimensional e tridimensional destes corpos possibilitam a avaliação indireta do contexto estruturalgeotécnico do terreno em estudo. O objetivo do trabalho consistiu na identificação e avaliação das formas e dimensões destas feições em umaárea que recentemente sofreu colapso de terreno, comprometendo edificações existentes na região. Qualitativamente, os resultados indicaram a existência de tratos onde potencialmente existe percolação deágua, ou solo muito saturado, segundo a análise da correlação das respostas dos métodos empregados. Do ponto de vista quantitativo, métodos de inversão de dados gravimétricos e resistivimétricos-IP permitiram estimar a forma e a profundidade dos corpos causadores das anomalias. Finalmente, os resultados mostraram que os métodos empregados podem serúteis na investigação de feições de dissolução, destacando regiões frágeis que podem comprometer a implantação de estruturas físicas na superfície.Palavras-chave: gravimetria, resistividade/IP, sistema aqüífero cárstico, risco geotécnico.

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“…There is a wide range of geophysical methods, for example, Ground Penetrating Radar (GPR), Electrical Resistivity Tomography (ERT) and Very Low Frequency Electromagnetic (VLFEM) methods which are considered to be appropriate techniques for the delineation of conductive and resistive structures in the subsurface [17][18][19][20][21][22][23][24][25][26][27]. Over the past couple of decades, the applications of GPR in the karst studies have increased and many improvements have been successfully implemented [28][29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

The Potential Use of Geophysical Methods to Identify Cavities, Sinkholes and Pathways for Water Infiltration

Hussain

Uagoda

Borges

et al. 2020

Water

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The use of geophysical characterization of karst systems can provide an economical and non-invasive alternative for extracting information about cavities, sinkholes, pathways for water infiltration as well as the degree of karstification of underlying carbonate rocks. In the present study, three geophysical techniques, namely, Ground Penetrating Radar (GPR), Electrical Resistivity Tomography (ERT) and Very Low Frequency Electromagnetic (VLFEM) methods were applied at three different locations in relation to fluvial karst, which is listed as an environmentally sensitive area in Rio Vermelho, Mambaí, Goiás, Brazil. In the data acquisition phase, the GPR, direct-current (DC) resistivity and VLFEM profiles were obtained at the three locations in the area. Data were analyzed using commonly adopted processing workflows. The GPR results showed a well-defined lithology of the site based on the amplitude of the signal and radar typologies. On the other hand, the inverted resistivity cross-sections showed a three-layered stratigraphy, pathways of water infiltration and the weathered structures in carbonate (Bambui group). The interpretation of VLFEM as contours of current density resulted from Fraser and Karous–Hjelt filters, indicated the presence of conductive structures (high apparent current density) that might be linked to the weathered carbonate and other conductive and resistive anomalies associated with the water-filled and dry cavities (cave), respectively. The results encourage the integrated application of geophysical techniques such as the reconnaissance for further detailed characterization of the karst areas.

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Detecção de cavidades em arenitos utilizando gravimetria, eletrorresistividade e GPR

Cited by 12 publications

References 3 publications

Gully Cavity Identification Through Electrical Resistivity Tomography

Gully Cavity Identification Through Electrical Resistivity Tomography

Aplicação dos métodos gravimétrico e eletroresistivimétrico-IP em área de risco geotécnico do sistema aqüífero cárstico em Almirante Tamandaré-PR

The Potential Use of Geophysical Methods to Identify Cavities, Sinkholes and Pathways for Water Infiltration

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