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広域地下水流動研究におけるボーリング調査(DH-15号孔) 結果速報

Advance report of DH-15 borehole investigations

池田 幸喜; 鶴田 忠彦; 松岡 稔幸; 彌榮 英樹; 藪内 聡

Ikeda, Koki; Tsuruta, Tadahiko; Matsuoka, Toshiyuki; Mie, Hideki; Yabuuchi, Satoshi

広域地下水流動研究の一環として、地下水流動系に大きな影響を与えるリニアメントとして地表に表れるような断層破砕帯の分布・性状、および各種特性の把握のための調査技術の構築を目的として、DH-15号孔のボーリング調査を実施した。その結果、既存ボーリング孔と同様の方向性、規模などを有する断層・割れ目帯の存在が推定されたほか、堆積岩と花崗岩の水理・地球化学特性に関する情報を取得した。

The Regional HydrogeologicaI Study (RHS) Project, which commenced in 1992, has been performed in the 10km-square area. It was intended for the development of an understanding of the geological environment at the regional and local area. The DH-15 borehole was drilled to develop the techniques of evaluations for the fracture zones whose presence have been observed by previous surveys around the MIU Construction Site. This advance report summarized to familiar the results of borehole investigations to person interested and to evaluate preliminary issues. Interpretations and conclusions described in this report will be revised depending on the progress of analytical works.

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