Abstract: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. T… Show more
“…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).…”
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.
“…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).…”
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.
On October 2008, the large extent of dissolution of limestone in the Irecê Basin resulted in the occurrence of minor ground shakes and the enhancement of fractures along the surface of the ground and on the walls of buildings in the urban and periurban area of the city of Lapão. After preliminary geological and geotechnical studies to analyse the danger of collapse of underground caves, we have carried out gravity and electro-resistivity profiles in order to map the concealed caves and to help the determination of the level of groundwater within them. The interpretation of the results provided useful information both for the immediate safety of the population and for subsequent hydrological and geotechnical work. We have defined five risk areas based on the variations of the Bouguer and of the electrical resistivity data, by correlating the distribution of gravity lows with the presence of caves and the less resistive zones with the presence of brine water underground. (a) ( b) Fig. 1. (a) Cracks along a downtown street of the city of Lapão. (b) Fractures in a plantation of onions.
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