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Toida, Masaru*; Shiogama, Yukihiro*; Atsumi, Hiroyuki; Masumoto, Kazuhiko*; Yasui, Shingo*; Abe, Yasunori*; Furuichi, Mitsuaki*
JNC TJ7440 2000-006, 137 Pages, 2000/02
JNC-TJ7440-2000-006.pdf:3.55MB
no abstracts in English
Miki, Takahito*; Sasamoto, Hiroshi; Chiba, Tamotsu*; Inagaki, Manabu*; Yui, Mikazu
JNC TN8400 2000-007, 32 Pages, 2000/01
JNC-TN8400-2000-007.pdf:0.69MB
This report presents a summary of literature survey about geochemical reactions which are important to evaluate the redox conditions in the near field rock mass and buffer. The results of literature survey are summarized as follows; (1)Minerals including ferrous iron and organic materials in the rock mass are important reductants. Initial stage after closure of repository, oxygen will be consumed by pyrite, because the reaction rate between pyrite and oxygen is relatively fast. (2)It is possible to estimate the redox capacity for reductants by rock (mineral)-water iteraction experiment in a laboratory. And it is expected that the ferrous iron-rich rock and higher porosity rock may have bigger redox capacity. (3)It is possible to estimate the oxygen consumption rate by reductants such as minerals including ferrous iron. The rate law and rate constant for the oxidation reaction of ferrous iron in the solution are also determined. As a conclusion, it seems that we can evaluate kinetically the evolution of geochemical conditions in the near field rock mass and buffer by excavation of drifts, based on data derived from these existing literatures.
Sato, Toshinori; Taniguchi, Wataru; Fujita, Tomoo; Hasegawa, Hiroshi
JNC TN7400 99-011, 36 Pages, 1999/12
In order to understand the general thermal and mechanical properties of rock masses and initial stress of rock at depth, data were compiled from the published literature in Japan and collected from investigations carried out at Kamaishi mine and Tono mine. Statistical examinations derived the ranges, means and medians of the mechanical properties for the different rock types. It was confirmed that the correlations between the mechanical properties were in agreement with correlations determined previously in other similar surveys. The unconfined compressive strength of Neogene sedimentary rocks showed a tendency to increase with increasing depth (
500 m). An examination of the measured initial stress data collected through literature surveys showed that the vertical stress can be approximated by the extent of gravitational loading at a particular point. There is an approximately linear relationship between the average stress in a horizontal plane and the depth. The lateral pressure coefficient tends to have a high value and large range at shallow depths, but tends towards 
1 with increasing depth.
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JNC TJ1420 2000-003, 1020 Pages, 1999/03
JNC-TJ1420-2000-003.pdf:110.99MB
no abstracts in English
Wada, Ryutaro*; Nishimura, Tsutomu*; Fujiwara, Kazuo*; ;
PNC TJ1058 97-003, 33 Pages, 1997/03
None
Wada, Ryutaro*; Nishimura, Tsutomu*; Fujiwara, Kazuo*; ;
PNC TJ1058 97-002, 430 Pages, 1997/03
None
Seno, Muneaki*; Ito, Kenji*; Ambo, Noriaki*; Fukaya, Masaaki*
PNC TJ1561 96-002, 54 Pages, 1996/02
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Seno, Muneaki*; Ito, Kenji*; Ambo, Noriaki*; Fukaya, Masaaki*
PNC TJ1561 96-001, 367 Pages, 1996/02
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