2021 Fiscal Year Final Research Report
Evaluation of properties of engineered and natural barriers focusing on the alteration of bentonite
| Project/Area Number |
19K15489
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 31020:Earth resource engineering, Energy sciences-related
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| Research Institution | Tottori University |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | 放射性廃棄物地層処分 / 人工バリア材 / 天然バリア材 / ベントナイト / 粘土鉱物 / 変質 / 膨潤圧 / 透水係数 |
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| Outline of Final Research Achievements |
In the geological disposal of radioactive waste, the deterioration of swelling performance and permeability due to the alteration of bentonite adversely affects the performance of the cushioning material. However, it can be regarded as a positive effect as it closes the cracks in the bedrock. Depending on the type of alteration occurring on bentonite, the degree of crack blockage in the bedrock and the composition of the blockage minerals may differ. The permeability of the bedrock is expected to differ accordingly. Boundaries between artificial barrier materials (bentonite-based materials), natural barrier materials (crystalline rocks), and both barrier materials are investigated in this study. Some of the effects of altered types and altered minerals (primarily clay minerals) on the physical properties of artificial and natural barrier materials related to geological disposal are clarified herein.
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| Free Research Field |
地盤工学，岩石力学，土木地質学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究成果は，地層処分に関わる人工・天然バリア材のより確実な長期安全性の実現に対して，これまで知り得なかった情報を取得でき，さらに，地下環境の状況に応じた適切なバリア材の選定・管理にも貢献できると考える．一方，近年の地震，津波，火山噴火などの地表での被害を考えると，力学的に安定した地下岩盤利用の可能性を広げることは必須である．地下環境下での透水性などの物性の把握により，地下環境の有効利用やエネルギー資源抽出・掘削の際の安定性評価，さらに，遮水壁や地すべり面粘土に関する研究にも展開できると予想される．このように，地盤工学や地殻工学・資源開発分野のみならず幅広い分野において波及効果が期待できる．
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