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Fracture domain of granite based on orientation analysis and its relation to water conducting fractures; An Example from the "-500m access/research gallery-North" of the Mizunami Underground Research Laboratory

方向解析による花崗岩の割れ目ドメイン解析と透水性割れ目の関係; 瑞浪超深地層研究所深度500m研究アクセス北坑道の例

島田 耕史   ; 丹羽 正和   ; 竹内 竜史  ; 天野 健治  

Shimada, Koji; Niwa, Masakazu; Takeuchi, Ryuji; Amano, Kenji

瑞浪超深地層研究所深度500m研究アクセス北坑道で得られた割れ目データを用いて、花崗岩中の割れ目方向に基くドメイン解析を、ステレオ投影法, 走向-測線距離法, 走向の逐次中央値連結法により実施した。逐次中央値連結法について、区間3の移動中央値を用いる改良を施したところ、割れ目方向のトレンドが屈曲するドメイン境界に、透水性割れ目の分布がよく集中していることが明らかとなった。ドメイン境界の一つは、深部との連結性の強い割れ目が集中する領域に一致する。

Domain analysis of granite on the basis of fracture orientation in the 100 m scale by means of structural geologic techniques such as stereographic projection, Strike Versus Traverse Distance diagram and Sequential Linked Median (SLIME) plot revealed relationship between distribution of water conducting fractures and fracture orientations. This attempt used fracture data taken from the "-500m access/research gallery-North" of the Mizunami Underground Research Laboratory. Improvement of the SLIME plot based on running median of span 3 shows water conducting fractures are concentrated at domain boundaries. A location of one of the large kinks corresponds to a region of fractures with geochemical high connectivity from deeper parts.

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