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Koide, Kaoru; Nakano, Katsushi; Takeuchi, Shinji; Hama, Katsuhiro; ; Ikeda, Koki;
JNC TN7400 2000-014, 83 Pages, 2000/11
JNC-TN7400-2000-014.pdf:4.84MB
The Japan Nuclear Cycle Development Institute (JNC) has been conducting a wide range of geoscientific research in order to build a firm scientific and technological basis for the research and development of geological disposal. One of the major components of the ongoing geoscientific research programme is the Regional Hydrogeological Study (RHS) project in the Tono region, central Japan. The main goal of the RHS project is to develop and demonstrate surface-based investigation methodologies to characterize geological environments at a regional scale in Japan. The RHS project was initiated in 1992. The first five years of the project were devoted mainly to develop methodologies and techniques for deep borehole investigations in crystalline rock in Japan. Investigations to verify the performance of new instruments and methods for borehole drilling, hydraulic testing and groundwater sampling were conducted. In the last four years, surface-based investigations and a stepwise development of models of the geological environment have been carried out. To date, remote sensing, geological mapping, airborne and ground geophysical investigations, and measurements in eleven deep boreholes have been carried out. Hydro monitorring is continuing in these boreholes. Important results that have been obtained from these investigations include multi-disciplinaly information about the heterogeneity of lithology and hydraulic, geochemical and rock mechanical properties of the granitic rock, and evolution of the groundwater geochemistry. Technical knowledge and experience have been accumulated, which allow application of the methodologies and techniques to characterize the geological environment in crystalline rock. The results from these R%D activities were used as prime inputs for the H12 report that JNC submitted to the Japanese Government in l999. Results from such R&D is also acknowledged by other geoscientific studies in general. JNC will synthesize the results from R&D ...
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JNC TJ7440 2000-005, 45 Pages, 2000/03
JNC-TJ7440-2000-005.pdf:2.72MB
no abstracts in English
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JNC TJ7440 2000-004, 52 Pages, 2000/03
JNC-TJ7440-2000-004.pdf:12.62MB
no abstracts in English
Yamada, Nobuto; Sasao, Eiji; Kuboshima, Koji*; Suzuki, Keiichi*
no journal, ,
JAEA and KGE perform the joint research on cosmic ray muons applying detection of sub-surface geological structure such as fault, using the research gallery of the Mizunami Underground Research Laboratry. We set the detectors of cosmic ray muons in the underground gallery to assess its applicability for estimating geological structure in deep underground. We estimate the geological structure by the number of cosmic ray muons observed from November 2013 to August 2014 and confirm that we can observe the substantial number of cosmic ray muons to estimate the geological structure in the research gallery of granite at G.L.-300m.
Yamada, Nobuto; Suzuki, Keiichi*; Kanazawa, Sunao*; Tsuge, Takashi*
no journal, ,
To evaluate the distribution of geological discontinuity such as fractures around the underground gallery is one of the important factors to conduct high level radioactive waste disposal, but it is difficult to evaluate them enough only by geological survey such as boring investigations. We carried out GPR to obtain the distribution of fractures exist nearby the underground gallery of granite in Mizunami Underground Research Laboratory, and understand that we can detect them by GPR.
Yamada, Nobuto; Sasao, Eiji; Suzuki, Keiichi*; Kuboshima, Koji*; Kanazawa, Sunao*
no journal, ,
JAEA and KGE perform the joint research on cosmic ray muons applying detection of sub-surface geological structure such as fault, using the research gallery of the Mizunami Underground Research Laboratory. We set the detectors of cosmic ray muons in the underground gallery to evaluate its applicability for estimating geological structure in deep underground. We estimate the geological structure by the number of cosmic ray muons observed from November 2013 to August 2014 and confirm that we can observe the substantial number of cosmic ray muons to estimate the geological structure in the research gallery of granite at -300m underground.
Kubota, Kenji*; Morifuji, Yohei*; Aoyagi, Kazuhei; Sugita, Yutaka
no journal, ,
We performed in-situ experiments such as seismic and electrical resistivity tomography, geological survey and so on before, during, and 11 years after excavation of galleries at 140 and 250 m depth in an area of soft sedimentary rock in the Horonobe Underground Research Laboratory, Hokkaido, Japan. The results demonstrate that the extent of fractures and unsaturated zone induced by the gallery excavation were clarified. The extent of fractures related with EDZ was limited in about 0.45 m from the gallery wall in the 140 m gallery and to about 1 m from the gallery wall in the 250 m gallery. The extent of the unsaturated zone related with EdZ was about 1 m in the 140 m gallery, but it was not appeared in the 250 m gallery. Such changes induced by the gallery excavation occurred within one year after gallery excavation. On the other hand, the extension of the developed fractures and unsaturated zone was hardly clarified in about 11 years after gallery excavation.