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緩衝材中の塩濃縮・析出現象評価に向けた数値実験システムの開発

Development of numerical simulation code for the salt accumulation/precipitation ocuur in the buffer material

木村 誠; 藤田 朝雄 ; 九石 正美

Kimura, Makoto; Fujita, Tomo; Sazarashi, Masami

塩濃縮・析出現象を表現可能な数値実験システムの構築を目的として、熱-水-応力-化学連成解析において地球化学モデルの改良を行い、不飽和緩衝材中の保水形態や浸潤履歴に基づくイオン交換反応や表面錯体形成といった地球化学反応を考慮した。改良した熱-水-応力-化学連成解析を用いて塩濃縮室内試験結果を対象とした解析を実施したところ、温度勾配の生じた不飽和/飽和領域で溶質移動の適切性を確認した。ただし、高温条件のもとで不飽和緩衝材中で生じる塩の析出量の定量評価には至らず、不飽和状態の地球化学反応モデルに関してさらなる高度化の必要性が示唆された。

For the purpose of developing of the coupled Thermo-Hydro-Mechanical-Chemical(THMC) simulation code which is available to the prediction of the salt accumulation/precipitation, a chemical reaction model paid attention to unsaturated buffer material is discussed. In the THMC simulation code, chemical reaction model such as ion-exchange and surface complexation which are based on water-retention form and infiltration history under the unsaturated condition is considered. Some results of THMC simulation against the laboratory test are shown and it is found that mass-transport under the unsaturated/saturated condition is suitable but necessary to consider the change of solid/liquid ratio for the chemical reaction.

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