Merits and potential of Georadar as a subsurface investigation tool: Experience at NGI during the past ten years

摘要

Based on more than ten years experience within georadar development and testing at NGI, possibilities and limitations of this technology are summarized. A number of field test results are shown, including transmission measurements/ cross hole radar tomography and classical radar reflection techniques. Data corresponding to different depth ranges and resolution are shown: from measurements of polar ice thickness (1000m) to imaging rebars 2 cm below a concrete surface. Field measurement examples of karst cavity detection, soil-rock interface mapping and ground water surface mapping are also presented. It is shown that the georadar in some cases reveal the most unbelievable details of the subsurface. In other, the results obtained are not so promising.