Geological Investigations for Geological Model of Deep Underground Geoenvironment at the Mizunami Underground Research Laboratory (MIU)

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  • Tsuruta Tadahiko
    Geological Isolation Research and Development Directorate, Japan Atomic Energy Agency
  • Tagami Masahiko
    Geological Isolation Research and Development Directorate, Japan Atomic Energy Agency Present address: Kawasaki Geological Engi neering Co., Ltd.
  • Amano Kenji
    Geological Isolation Research and Development Directorate, Japan Atomic Energy Agency
  • Matsuoka Toshiyuki
    Geological Isolation Research and Development Directorate, Japan Atomic Energy Agency
  • Kurihara Arata
    Geological Isolation Research and Development Directorate, Japan Atomic Energy Agency Present address: Dia Consultans
  • Yamada Yasuhiro
    Laboratory of Environment and Resource System Engineering, Department of Urban Management, Graduate School of Engineering, Kyoto University
  • Koike Katsuaki
    Laboratory of Environmental Geosphere Engineering, Department of Urban Management, Graduate School of Engineering, Kyoto University

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Other Title
  • 瑞浪超深地層研究所における深部地質環境のモデル化を目指した地質学的調査
  • ミズナミ チョウシンチソウ ケンキュウジョ ニ オケル シンブ チシツ カンキョウ ノ モデルカ オ メザシタ チシツガクテキ チョウサ

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Abstract

Japan Atomic Energy Agency (JAEA) is performing a geoscientific research project, the Mizunami Underground Research Laboratory (MIU) project, in order to establish scientific and technological basis for geological disposal of high-level radioactive wastes. The MIU is located in crystalline rock environment, in Mizunami City, central Japan. Field investigations include geological mapping, reflection seismic surveys, several borehole investigations and geological investigations in the research galleries to identify the distribution and heterogeneity of fractures and faults that are potential major flowpaths for groundwater. The results of these field investigations are synthesized and compiled for the purpose of geological modeling. The field investigations indicate that the Main Shaft at the MIU intersected low permeability NNW oriented faults. A high permeability fracture zone in the granite, a significant water inflow point, was observed in the Ventilation Shaft. Development of the geological model focusing 3D spatial relationships at different scales and evolution of the geoenvironment are underway. This paper describes geological investigations applied in the MIU project, focusing on the evaluation of their effectiveness to understand for deep underground geoenviroment.

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