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

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

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.