大規模地下施設の建設に伴う周辺地下水環境の変化 Hydrochemical Changes Associated with Construction of a Large Underground Facility

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著者

    • 岩月 輝希 IWATSUKI Teruki
    • (独)日本原子力開発機構 東濃地科学センター Mizunami Underground Research Laboratory, Japan Atomic Energy Agency
    • 天野 由記 AMANO Yuki
    • (独)日本原子力開発機構 東濃地科学センター Mizunami Underground Research Laboratory, Japan Atomic Energy Agency
    • 竹内 竜二 TAKEUCHI Ryuji
    • (独)日本原子力開発機構 東濃地科学センター Mizunami Underground Research Laboratory, Japan Atomic Energy Agency

抄録

  The Japan Atomic Energy Agency (JAEA) is constructing the Mizunami Underground Research Laboratory at Mizunami, Japan to establish general techniques for the assessment of the deep geological environment. The facility including two 1,000 m shafts and sub-stages at 100 m depths between two shafts is currently under construction in the sedimentary rocks. This study aims to evaluate the environmental changes around a large underground facility. To this end, hydrochemical changes in response to shaft excavation are assessed based on the observation of hydraulic head and groundwater chemistry around the facility.<br>   The observations indicated that rock formations with low hydraulic conductivity act as barriers to hydraulic disturbances, while higher conductivity zones provide a preferential flow path. Groundwater flow to the drifts creates chemical changes by mixing among chemically different groundwaters in higher conductivity zones. It is therefore meaningful to monitor the water pressure and chemistry at highly conductive rock formations during construction and operation of underground facilities. These investigations will provide the basic information on hydrochemical buffer capacity of the natural environment. Furthermore, observations suggest that grouting of conductive rock formations is important for maintaining the groundwater at near preconstruction levels so as to retain the buffer capacity of the rock formations used for safety assessment.<br>

収録刊行物

  • 日本原子力学会和文論文誌 = Transactions of the Atomic Energy Society of Japan  

    日本原子力学会和文論文誌 = Transactions of the Atomic Energy Society of Japan 6(1), 73-84, 2007-03-25 

    Atomic Energy Society of Japan

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各種コード

  • NII論文ID(NAID)
    10018413555
  • NII書誌ID(NCID)
    AA11643165
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    13472879
  • NDL 記事登録ID
    8772432
  • NDL 雑誌分類
    ZN36(科学技術--原子力工学・工業)
  • NDL 請求記号
    Z74-C788
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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