Geophysical detection of underground cavities

Engineering Geology for Society and Territory - Volume 5, 2014

Journal of Applied Geophysics, 2004

Near Surface Geophysics, 2008

2012

GEOPHYSICS, 1984

2017

In civil engineering, the presence of underground cavities in the soil and the subsoil constitutes a serious problem for urban planning. These phenomena may give rise to many collapses, not to say sometimes catastrophically for buildings and infrastructures (roads, pipes, etc.). In the geotechnical zoning context of this risk, it is essential to know the location of the cavities in order to subdivide the area studied in areas according to the potential degree of risk. This study evaluates the application of the method Geophysics of the electrical tomography for the underground cavities detection in two plots of the Fez city. The analysis of the results shows that the plots studied are actually affected by these risks of underground cavities represented by zones of high resistivities, verified and confirmed by mechanical polls. Because this type of soil flaw unfortunately is often hidden and may bring about serious threats to the stability of the soil. In this respect, we have the ca...

Environmental Geology, 2008

Apparent Resistivity Method studies geological structures using changeability of electrical resistivity's of minerals or underground natural and artificial objects and surrounding rocks. This is realized through study of how injected electrical field is scattered underground. The main objective of this paper is to establish the optimal survey, processing and interpretation methodology of geoelectrical data surveyed above a known geological model. In the paper is treated processing and interpretation of geoelectrical data using classical " Pseudosection " technique and " Real Section " technique, comparing of results obtained from each technique and defining advantages and disadvantages of each of them. A help for a correct survey, processing and interpretation of field data gives lab modeling of geological situation and data simulation over this model. This way he has a valuable information about field surveys arrays and the shape and intensity of geoelectrical anomaly. In order to have a notable apparent resistivity contrast we have performed field surveys over an abandoned emergency tunnel in side of Faculty of Geology and Mines.

2024