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| | Abstract | | It's assumed that looseness in geologic age is distributed over the part of the dam foundation, an EM investigation was applied to the dam foundation rock evaluation performed daily in the concrete dam which is being built. Validity inspection of an investigation was performed compared with a preliminary geological survey result and an electric prospecting result by an EM investigation result, natural ground circumstances and bowling, etc.. As a result, the precision-like problem of an investigation was also confirmed, but the natural ground situation and harmonized data were also obtained. It isn't necessary to install a pickup and when there are a lot of merits, to use the EM investigation which is the simple method it's possible to analyze relatively by a short time like a construction management seems, and I'd like to measure and build looseness evaluation technique by inspection and a specific resistance of the investigation precision continually from now on. |
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