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超深地層研究所計画;地質環境特性の長期変遷解析技術に関する研究; 地質構造モデルの構築と主立坑断層近傍の割れ目の特徴

Mizunami Underground Research Laboratory Project; A Study on the long-term evolution analysis technology of geological environment characteristics; Development of geological models, and the features of fractures around the Main shaft fault

野原 壯; 酒井 利啓; 村上 裕晃; 石橋 正祐紀

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

超深地層研究所計画において、花崗岩中の断層や割れ目の分布と地質環境への影響に関する調査研究を行った。深度500mステージの調査結果を加えて第2段階における地質構造モデルを構築するとともに、その結果を踏まえて、第1段階で構築した地質構造モデルの妥当性を確認した。また、岩盤の透水性と割れ目充填物との関係を調べた。その結果、卓越する充填物の種類によって、岩盤の透水性が異なることを確認した。

It was carried out research on influences of the faults and fractures distribution and geological environment in granitic rocks, in the Mizunami Underground Research Laboratory (MIU) Project. The geological model was updated based on the information of the distributions of lithofacies and geological structures at a depth 500m research galleries, and besides, the validity of the geological model of the site scale developed in the Phase I is confirmed by comparing with the updated model. The relationship between the permeability and fracture filling materials in granitic rocks was examined. As a result, it is confirmed that the water permeability is different by the kind of filling mineral dominant.

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