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[en] Bentonite based buffer will change its condition from unsaturated state to saturation by groundwater seepage in high level radioactive waste disposal facility. This study has investigated water migration and swelling pressure characteristics in bentonite based buffer from unsaturated state to saturation from the viewpoint of material specifications such as kinds of bentonite and dry density. From the experimental results in this study, water migration behaviors in various powder bentonites as buffer have an analogy to water-diffusion from initial water content to around 90% saturation. Furthermore, the inflection points have appeared at around 90% saturation in the relationships between swelling-pressure and elapsed time. Therefore, the factor dominating water migration in buffer will change according to alternation of micro-structure in bentonite based buffers by swelling. (author)
[ja]
高レベル放射性廃棄物地層処分の地下施設におけるベントナイト系緩衝材は，地下水の浸入に伴い不飽和から飽和へと遷移する．本研究では，ベントナイトの種類や乾燥密度等の材料仕様の観点から，不飽和から飽和に至る過程の水分移動と膨潤圧挙動との関係について，国内外の粉体状ベントナイト各種を用いて実験的に調査した．その結果，吸水開始から飽和度90%程度の範囲で水分移動は拡散的な挙動と見なせることを示した．また，飽和度90%程度の時点で膨潤圧の発生挙動に変曲点が認められ，膨潤に伴う緩衝材中の構造的な変化に起因して，水分移動の支配的な要因が変化したと考察した．(著者)Journal
Doboku Gakkai Ronbunshu C. Chiken Kougaku; ISSN 2185-6516; 
; v. 74(1); p. 63-75
; v. 74(1); p. 63-75