Study on Extraction of Hydro-geological Structure and Mass Transport Pass in the Tertiary Sedimentary Rocks Based on Field Observation.

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  • SUGIYAMA Kazutoshi
    Research and Planning Department, Mitsubishi Materials Natural Resources Development Corporation
  • IKEDA Norio
    Research and Planning Department, Mitsubishi Materials Natural Resources Development Corporation
  • SAITO Shigeyuki
    Fuel Technology Center, Mitsubishi Materials Corporation
  • MOROOKA Koichi
    Tokai Works, Japan Nuclear Cycle Development Institute
  • UCHIDA Masahiro
    Tokai Works, Japan Nuclear Cycle Development Institute

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Other Title
  • 露頭観察に基づく新第三紀堆積岩中の水理・物質移行経路抽出の試み
  • ロトウ カンサツ ニ モトヅク シンダイ3キ タイセキガン チュウ ノ スイリ ブッシツ イコウ ケイロ チュウシュツ ノ ココロミ

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In order to manage issues concerning groundwater environment often created by construction of underground facilities, it is important to understand the hydro-geological features and potential transport pathways including fractures and matrices of bedrock. In this paper, the authors present the result of a field survey conducted in Tertiary sedimentary rock area with the aim of developing the exploration method for modeling hydrogeological structures and transport pathways. The results of this study can be summarized as follows:<BR>·Fractures can be divided into several groups based on their features, orientations, fracturing ages and others.<BR>·The specific fracture groups play a primary role in groundwater flow.<BR>·Rock matrices of sandstone and mudstone conduct small amount groundwater flow.<BR>Based on these results, a conceptual model of the water conducting features is discussed.

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