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Ijiri, Yuji; ;
JNC TN8400 99-091, 69 Pages, 1999/11
It is crucial for the performance assessment of geosphere to evaluate the characteristics of fractures that can be dominant radionuclide migration pathways from a repository to biosphere. This report summarizes the charactelistics of fractures obtained from broad literature surveys and the fields surveys at the Kamaishi mine in northern Japan and at outcrops and galleries throughout the country. The characteristics of fractures described in this report are fracture orientation, fracture shape, fracture frequency, fracture distribution in space, transmissivity of fracture, fracture aperture, fracture fillings, alteration halo along fracture, flow-wetted surface area in fracture, and the correlation among these characteristics. Since granitic rock is considered the archetype fractured media, a large amount of fracture data is available in literature. In addition, granitic rock has been treated as a potential host rock in many overseas programs, and has JNC performed a number of field observations and experiments in granodiorite at the Kamaishi mine. Therefore, the characteristics of fractures in granitic rock are qualitatively and quantitatively clarified to some extent in this report, while the characteristics of fractures in another rock types are not clarified.
Shimo, Michito*; Yamamoto, Hajime*; Takahara, Hiroyuki*; Doe, T.*
PNC TJ1205 98-001, 255 Pages, 1998/03
None
Yoneda, Yoshihiro*; Takahara, Hiroyuki*; Nakamura, Naoaki*; Akiyama, Shinsuke*; Moriya, Toshifumi*; Negi, Tateyuki*
PNC TJ1380 97-001, 1338 Pages, 1997/03
None
Shimo, Michito*; Yamamoto, Hajime*; Takahara, Hiroyuki*; Negi, Tateyuki*; Doe, T.*
PNC TJ1205 96-003, 340 Pages, 1996/03
None
Sugita, Yutaka; Kanno, Takeshi; Ishikawa, Hirohisa; Ishiguro, Katsuhiko
PNC TN8410 96-014, 46 Pages, 1995/12
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Yokoi, Koichi*; Noguchi, Yoshifumi*; Morita, Masaya*; Nakamura, Naoaki*; Takahara, Hiroyuki*; Moriya, Toshifumi*
PNC TJ1380 95-004, 235 Pages, 1995/03
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