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Combined Application of GPR and ERT to the Detection of Voids During the Construction Phase of a Building Complex in Koz
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 23rd European Meeting of Environmental and Engineering Geophysics, Sep 2017, Volume 2017, p.1 - 5
Abstract
Several cavities were revealed during the excavation phase of the new building complex planned to host the regional University in the city of Kozani, Combined 3D geoelectrical and GPR geophysical methods have been applied at the foundation level prior the construction phase in order to detect voids. Initially, the foundation areas have been surveyed with dense GPR scans.
GPR data were processed and combined to form depth slices and 3D volumetric information. Targets revealed by the interpretation of radar data have been further investigated by the resistivity method which was applied in a full 3D mode at selected areas.
Evaluation of the results obtained by both methods led to the distinction of different type of structures related to possible voids or fractured areas. Locations proposed by the geophysical survey have been drilled and borehole data in most of the cases confirmed the geophysical results. This helped to better evaluate the geophysical anomalies and to increase the reliability of the interpreted data. The described approach resulted either into accelerating the construction of the buildings in areas that no geophysical anomalies were found or to redesign and to redesign construction in specific areas in which voids were detected.