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岩盤内の不飽和領域のメカニズムに関する研究(先行基礎工学研究に関する共同研究報告書)

Study on the Mechanism of the Unsaturated Zone in Rock Mass

杉田 裕; 菊池 広人*; 小松 満*; 西垣 誠*; 赤木 洋介*

Sugita, Yutaka; Kikuchi, Hirohito*; Komatsu, Mitsuru*; Nishigaki, Makoto*; Akagi, Yosuke*

高レベル放射性廃棄物の地層処分において処分坑道の掘削に伴い生じる掘削影響領域を考慮した処分坑道周辺での不飽和領域の発生および埋め戻し後の再冠水メカニズムに関しての基礎的研究として,平成10年度から平成12年度の3カ年で岡山大学環境理工学部と共同研究を実施した。研究では,核燃料サイクル開発機構が所有する多孔質媒体不飽和水理試験設備および岡山大学が所有する瞬時水分計測装置,FDR誘電率水分計を用い,不飽和領域の再現,計測を行った。具体的には,坑道周辺に発生する不飽和のメカニズムに関する室内モデル試験の実施,モデル材料の飽和-不飽和水理特性の把握,不飽和水理特性の計測手法の適用性の確認,不飽和水理解析の実施により,基礎データを取得することができた。

In geological disposal of high-level radioactive waste (HLW), unsaturated zone will be expected to appear around the disposal tunnel due to the construction of the tunnel. Cooperative research between JNC and Okayama University has done to understand the mechanism of the unsaturation process and the re-saturation process around the tunnel from FY1998 to FY2000.Characterizing Laboratory test on Unsaturated zonE (CLUE) of JNC was used to simulate the unsaturation process, and the piezometer and frequency domain reflectometry (FDR) of Okayama University were used to measure the unsaturation behavior of the CLUE.During this study, the laboratory experiments were performed and the saturation-unsaturation hydraulic characteristics of the material were obtained. The applicability of the FDR to measure the unsaturation condition was examined. Unsaturation hydraulic analysis technique was also applied.These studies supplied the fundamental data on unsaturation processes around the tunnel.

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