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Sakai, Toshihiro; Hayano, Akira
JAEA-Data/Code 2021-010, 243 Pages, 2021/10
JAEA-Data-Code-2021-010.pdf:62.15MB
JAEA-Data-Code-2021-010-appendix1(CD-ROM).zip:95.55MBJAEA-Data-Code-2021-010-appendix2(CD-ROM).zip:152.69MBJAEA-Data-Code-2021-010-appendix3(CD-ROM).zip:25.48MB
The Horonobe Underground Research Laboratory (URL) Project is being pursued by the Japan Atomic Energy Agency (JAEA) to enhance the reliability of relevant disposal technologies through investigations of the deep geological environment within the host sedimentary formations at Horonobe, northern Hokkaido. The project consists of two major research areas, "Geoscientific Research" and "R&D on Geological Disposal", and proceeds in three overlapping phases, "Phase I: Surface-based investigation", "Phase II: Construction" and "Phase III: Operation". The geological survey has been carried out at the shafts and the galleries in the Phase II. The geological survey was carried out during the excavation cycle, and the data were obtained for each an excavation cross section. This report shows the data which the individual geological data were integrated for the geological survey at the shafts and the galleries from the surface to a depth of 380m.
Sakai, Toshihiro; Ishii, Eiichi
JAEA-Data/Code 2021-009, 13 Pages, 2021/08
JAEA-Data-Code-2021-009.pdf:1.9MBJAEA-Data-Code-2021-009-appendix(CD-ROM).zip:42.79MB
Japan Atomic Energy Agency is performing the Horonobe Underground Research Laboratory Project, which includes a scientific study of the deep geological environment as a basis of research and development for the geological disposal of high level radioactive wastes, in order to establish comprehensive techniques for the investigation, analysis and assessment of the deep geological environment in the sedimentary rock. The numerical data of 3D geological model in regional-scale was compiled in 2019 as JAEA-Data/Code 2019-007, and then this report updates a part of the numerical data of 3D geological model around the underground facilities.
Sakai, Toshihiro; Matsuoka, Toshiyuki
JAEA-Data/Code 2019-007, 29 Pages, 2019/09
JAEA-Data-Code-2019-007.pdf:53.07MBJAEA-Data-Code-2019-007-appendix(CD-ROM).zip:340.04MB
Japan Atomic Energy Agency is performing the Horonobe Underground Research Laboratory Project, which includes a scientific study of the deep geological environment as a basis of research and development for the geological disposal of high level radioactive wastes, in order to establish comprehensive techniques for the investigation, analysis and assessment of the deep geological environment in the sedimentary rock. This report summarize numerical data of 3D geological model in regional-scale constructed by Maptek
Vulcan.
Sakai, Toshihiro
JAEA-Data/Code 2018-006, 75 Pages, 2018/07
JAEA-Data-Code-2018-006.pdf:2.9MBJAEA-Data-Code-2018-006-appendix(CD-ROM).zip:0.87MB
Data of bulk chemical compositions (major elements and trace elements) and/or of modal compositions of the Toki granitic body are compiled as a data-base for the purpose of improving geological and petrological basic information of the Mizunami Underground Research Laboratory Project and the Regional Hydrogeological Study Project. 696 rock samples are collected from the outcrops and boreholes of the Regional Hydrogeological Study Project, and 636 rock samples are collected from the Mizunami Underground Research Laboratory Construction Site. The analysis data of rock samples, as granitic rock samples, intrusive rock samples and crack filling samples, are attached three-dimensional position information to each thesis and report.
Sakai, Toshihiro; Nohara, Tsuyoshi; Ishibashi, Masayuki
JAEA-Research 2016-009, 27 Pages, 2016/07
JAEA-Research-2016-009.pdf:4.05MB
In the Phase II, the geophysical and geological surveys, and the borehole investigation of the research galleries were carried out and the results obtained were used to validate and update the geological model. Through these surveys and analysis work, we confirmed the geological properties and the distribution of model components and evaluated the accuracy of these research methods. This report presents the geological model 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.
Sakai, Toshihiro; Matsuoka, Toshiyuki
JAEA-Research 2015-004, 109 Pages, 2015/06
JAEA-Research-2015-004.pdf:141.42MBJAEA-Research-2015-004-appendix(CD-ROM).zip:128.66MB
We update the geologic map and the database of the geological mapping published by Funaki et al. (2005a) and Ota et al. (2007) based on geological survey and topographical analysis data in and around the Horonobe area. There are many geological survey data which are derived from natural resources (petroleum, natural gas and coal, etc.) exploration in and around Horonobe-cho. We also use these data in addition to data in Funaki et al. (2005a) and Ota et al. (2007)'s data. As results of this report, we also construct a digital geologic map and a digital database of geological survey using GIS. These results can be expected to improve the precision of modeling and analyzing of geological environment, and its long-term evaluation.
Sakai, Toshihiro; Matsuoka, Toshiyuki; Amano, Kenji
JAEA-Data/Code 2014-005, 43 Pages, 2014/05
JAEA-Data-Code-2014-005.pdf:33.23MBJAEA-Data-Code-2014-005-appendix(DVD).zip:940.62MB
The Horonobe Underground Research Laboratory (URL) Project is being pursued by the Japan Atomic Energy Agency (JAEA) at Horonobe-cho in Northern Hokkaido, Japan. One of the main goals of the URL project is to establish techniques for investigation, analysis and assessment of the deep geological environment. As a part of this URL project, we develop the geological environment modeling technique. 10m grid digital elevation model (DEM) had been published by Geographical Survey Institute in 2008. The use of 10m grid DEM has made possible examination of detailed topographical features in wide area. We created eighteen kinds of filterd image data using 10m grid DEM around the Horonobe-cho to obtain the basic information for evaluating topographical and geological features and constructing the geological environment model.
Niizato, Tadafumi; Abe, Hironobu; Sato, Haruo; Sakai, Toshihiro; Tanaka, Shingo; Aoki, Kazuhiro
no journal, ,
This paper presents preliminary results of depth distributions of radionuclides released by accident of Fukushima Dai-ichi Nuclear Power Station, TEPCO and its relationship with landform, soil, geology, and land use of investigation area.
Nohara, Tsuyoshi; Sakai, Toshihiro; Ishibashi, Masayuki; Matsumoto, Jun*
no journal, ,
Data analysis about the distribution of the high-angle fault (Main-shaft fault) and the water permeability in the granite was performed in MIU. We recognized wide range of strike of a fault and that the spray fault and the fault crowd are observed in a shallow depth in the tunnel scale. I could think fault and altered-zone distributed successively, and formed a low permeable zone.
Nohara, Tsuyoshi; Sakai, Toshihiro; Murakami, Hiroaki; Ishibashi, Masayuki
no journal, ,
Existing data was analyzed in order to understand Hydrological and Geological Characterization of deep subsurface structures in and around the Main Shaft fault at the Mizunami Underground Research Laboratory. As a result, in response to the low permeability structure of the Main Shaft Fault, fault gouges and alteration parts are found to be continuously distributed in the wall of the Main Shaft. One of the most high-permeable structure was estimated to be constituted by low-angle fractures with a sheet-like calcite. Shear of low angle fractures showed relatively low permeability. It may be possible to understand the permeability structure of these features in a drilling survey of granitic rocks.
Nohara, Tsuyoshi; Takeuchi, Ryuji; Sakai, Toshihiro
no journal, ,
Focusing on the characteristics of the faults and fractures of the MIU, based on analysis of existing data and on geological investigations, we examined the geological and hydrological features of the deep underground granitic rocks in the site scale. As a result, main permeable structures of granitic rocks can be associated with the old structures formed with the faulting and/or hydrothermal activity in geological times. Furthermore, we examined the distribution of the major permeable structures, based on the distribution of the geological structures.
Nohara, Tsuyoshi; Sakai, Toshihiro; Murakami, Hiroaki; Ishibashi, Masayuki
no journal, ,
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.
Nohara, Tsuyoshi; Sakai, Toshihiro; Murakami, Hiroaki
no journal, ,
Research on history of the fracture formation and fracture filling in the Toki granite was carried out, in the Mizunami Underground Research Laboratory (MIU) Project. It is recognized that some fractures in the Toki granite are related to high temperature fluid. Rock permeability was decreased by Quartz precipitations in the fracture which were related to injection of the high temperature fluid.