Journal of Earth Sciences and Geotechnical Engineering

Application of half Schlumberger configuration for detecting karstic cavities and voids for a wind farm site in Greece

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• Abstract

  At the preliminary site investigation stage for a wind farm in Central Continental Greece, the half Schlumberger configuration was selected before using direct investigation methods. The purpose of this geophysical investigation was to measure earth resistivity for detecting karstic cavities and voids beneath the foundations of wind turbines. The half Schlumberger method is more rapid than the typical Wenner method but also proved to work efficiently for the difficult task of cavity detection. The wind turbines are very sensitive structures that need careful design for their site investigation and it was proved that when geophysical surveys precede drilling, unforeseen foundation costs can be predicted and in parallel the site investigation is optimized in quality, cost and time. The results of 42 depth probe profiles that were performed on the site are analyzed and shortly presented in this paper.