書誌事項
- タイトル別名
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- Evaluation of hydrogeochemical processes provoked by tunnel excavation and closure based on simulated experiment in a mock-up test drift
- コウドウ ヘイサ シケン ニ モトズク コウドウ クッサク ・ ヘイサジ ノ カガク カンキョウ ヘンカ プロセス ノ コウサツ
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<p>In assessing the safety of geological disposal of high-level radioactive waste, groundwater chemistry is an important factor influencing the performance of engineered materials and the behavior of radionuclides. It is essential to understand the hydrochemical changing process and stable condition after the closure of the disposal facilities. In this study, a simulated experimental drift was constructed in granite at a depth of 500 m at the Mizunami Underground Research Laboratory, and the hydrochemical condition and related processes after drift closure were observed. The groundwater flow and chemistry around the excavated drift changed owing to water inflow along fractures into the drift. The redox potential increased owing to the infiltration of oxygen from the drift. After closing the drift, the groundwater evolved chemically with time owing to mixing of the groundwaters derived from surrounding rocks, dissolution of shotcrete, and microbial reactions. The redox potential plunged to the initial baseline value in three months owing to the reducing activity of microbes, while the groundwater became alkaline owing to the influence of the dissolved shotcrete. If the content of a pH-buffer mineral in a rock is small compared with the cementaceous materials used, the alkaline groundwater probably spreads broadly in surrounding rock. In the future, it is necessary to verify the water chemistry evolved by the interaction between the alkaline groundwater and granite minerals.</p>
収録刊行物
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- 地球化学
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地球化学 52 (1), 55-71, 2018
一般社団法人日本地球化学会
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詳細情報 詳細情報について
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- CRID
- 1390001205741026688
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- NII論文ID
- 130006549781
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- NII書誌ID
- AN00141280
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- ISSN
- 21885923
- 03864073
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- NDL書誌ID
- 028958733
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可