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Rapid sealing of bed rock flow paths by a synthetic concentration forming solvent

コンクリーションによる岩盤中の水みちの急速な閉塞

吉田 英一*; 山本 鋼志*; 淺原 良浩*; 刈茅 孝一*; 松井 裕哉 ; Metcalfe, R.*

Yoshida, Hidekazu*; Yamamoto, Koshi*; Asahara, Yoshihiro*; Karukaya, Koichi*; Matsui, Hiroya; Metcalfe, R.*

岩盤中の水みち閉塞のためのコンクリーション化充填材に関する原位置試験を幌延深地層研究所を活用した実施した結果、岩盤の透水係数が1年間で初期値から2から3オーダー低減することを示した。この閉塞技術は、地下における長期的な物質の保持を必要とする二酸化炭素の地下貯留や高レベル放射性廃棄物の地層処分などにも適用可能と考えられる。

The ability of synthetic concretion-forming solvents to seal groundwater flow-paths by rapid precipitation of CaCO$$_{3}$$ in bed rock flow-paths has been tested by an in-situ experiment in the underground research laboratory (URL) located in Horonobe, northern Hokkaido, Japan. The experiment showed a decrease in permeability to as low as 1/100 to 1/1,000 of the initial permeability over a period of one year. This sealing process can be applied to various activities that require long-term containment of materials underground, for example abandonment of boreholes connected with hydrocarbon extraction, or CO$$_{2}$$ injection, or sealing of facilities for geological disposal of nuclear wastes.

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