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Investigation of the EDZ using high-resolution GPR with modulating frequency

可変周波数型高精度地中レーダーを用いた坑道掘削領域調査手法

須山 泰宏*; 戸井田 克*; 升元 一彦*; 竹内 真司

Suyama, Yasuhiro*; Toida, Masaru*; Masumoto, Kazuhiko*; Takeuchi, Shinji

放射性廃棄物の性能評価では、原位置における坑道掘削影響領域(EDZ)の把握が必要である。EDZを把握する手法の開発として、可変周波数による高精度地中レーダーの現場適用性を東濃鉱山坑道内で実施した。その結果、本手法はEDZの構造を高精度で把握する手法であることがわかった。

The EDZ is considered to be a fast transport pathway and provides a boundary condition for transport in bentonite buffers in groundwater scenarios for the geological disposal of radioactive waste. The distribution of the EDZ obtained through in-situ measurements, is important for safety assessments. High-resolution Ground Penetrating Radar (HGPR) with modulating frequency functions as a wide-angle measurement technique. It is one of the advanced techniques that can be used to investigate the EDZ of a radioactive waste disposal tunnel. Verification tests of the HGPR were carried out using a model and in-situ, in the gallery of Tono mine in central Japan. In summary, it is shown that the investigation technique was able to detect underground structures with a resolution of less than 0.1m.

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