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瑞浪超深地層研究所主立坑断層およびその周辺の水理と地質の特徴

Hydrological and geological characterization of deep subsurface structures in and around the main shaft fault at the Mizunami Underground Research Laboratory

野原 壯; 酒井 利啓; 村上 裕晃; 石橋 正祐紀

Nohara, Tsuyoshi; Sakai, Toshihiro; Murakami, Hiroaki; Ishibashi, Masayuki

瑞浪超深地層研究所の主立坑断層およびその周辺の水理と地質の特徴について、既存データの解析を行った。その結果、ボーリング調査で推定された主立坑断層の低透水性構造の連続性に対応して、主立坑壁面に連続的に観察される断層ガウジと変質部が確認された。主な高透水性構造のひとつは、シート状の方解石を伴う低角割れ目によって構成されると推定された。せん断性の低角割れ目は、比較的低い透水性を示した。花崗岩のボーリング調査では、これらの特徴から透水性構造を把握できる可能性がある。

Existing data was analyzed in order to understand Hydrological and Geological Characterization of deep subsurface structures in and around the Main Shaft fault at the Mizunami Underground Research Laboratory. As a result, in response to the low permeability structure of the Main Shaft Fault, fault gouges and alteration parts are found to be continuously distributed in the wall of the Main Shaft. One of the most high-permeable structure was estimated to be constituted by low-angle fractures with a sheet-like calcite. Shear of low angle fractures showed relatively low permeability. It may be possible to understand the permeability structure of these features in a drilling survey of granitic rocks.

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