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拡散モデルを用いた侵入現象による緩衝材密度変化の事例解析

Analysis of Case with Change of Density of Buffer Material by Extrusion Behavior to Use Diffusion Model

松本 一浩*; 棚井 憲治; 菅野 毅*; 岩田 裕美子*

Matsumoto, Kazuhiro*; Tanai, Kenji; Kanno, Takeshi*; Iwata, Yumiko*

高レベル放射性廃棄物の地層処分において,緩衝材の物理的安定性に影響を及ぼす事象として,緩衝材の流出/侵入挙動が考えられる。本報では,侵入現象のモデル化で用いている緩衝材の物性データに関する検討ならびに見直しを行い、モデルの評価精度の向上を図った。また、緩衝材の侵入現象に伴う長期的な密度変化に関して事例解析を実施し,侵入現象モデルの今後の課題を明確化した。

The buffer that will be used as a component of the engineered barriers system swells when saturated by groundwater. As a result of this swelling, buffer may penetrate into the peripheral rock zone surrounding the buffer through open fractures. It sustained for extremely long periods of time, the buffer extrusion could lead to reduction of buffer density, which may in turn degrade the assumed performance. In this report, the viscosity of bentonite was measured as one of the parameter of diffusion model. In addition, the simulation analysis was carried out to confirm the applicability of diffusion model. Moreover, an analytical evaluation on extrusion behavior of buffer into rock fractures was performed due to estimate the long-term stability of buffer as reduction of density.

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