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Mikake, Shinichiro; Yamamoto, Masaru; Ikeda, Koki; Sugihara, Kozo; Takeuchi, Shinji; Hayano, Akira; Sato, Toshinori; Takeda, Shinichi; Ishii, Yoji; Ishida, Hideaki; et al.
JAEA-Technology 2010-026, 146 Pages, 2010/08
JAEA-Technology-2010-026.pdf:41.08MB
JAEA-Technology-2010-026-appendix(CD-ROM).zip:83.37MB
The Mizunami Underground Research Laboratory (MIU), one of the main facilities in Japan for research and development of the technology for high-level radioactive waste disposal, is under construction in Mizunami City. In planning the construction, it was necessary to get reliable information on the bedrock conditions, specifically the rock mass stability and hydrogeology. Therefore, borehole investigations were conducted before excavations started. The results indicated that large water inflow could be expected during the excavation around the Ventilation Shaft at GL-200m and GL-300m Access/Research Gallery. In order to reduce water inflow, pre-excavation grouting was conducted before excavation of shafts and research tunnels. Grouting is the injection of material such as cement into a rock mass to stabilize and seal the rock. This report describes the knowledge and lessons learned during the planning and conducting of pre-excavation grouting.
Nishio, Kazuhisa; Matsuoka, Toshiyuki; Mikake, Shinichiro; Tsuruta, Tadahiko; Amano, Kenji; Oyama, Takuya; Takeuchi, Ryuji; Saegusa, Hiromitsu; Hama, Katsuhiro; Yoshida, Haruo*; et al.
JAEA-Review 2009-001, 110 Pages, 2009/03
JAEA-Review-2009-001.pdf:49.84MB
Japan Atomic Energy Agency (JAEA) at Tono Geoscience Center (TGC) is developing a geoscientific research project named Mizunami Underground Research Laboratory (MIU) project in crystalline rock environment in order to establish scientific and technological basis for geological disposal of HLW. Geoscientific research at MIU is planned to be carried out in three phases over a period of 20 years; Surface-based Investigation Phase (Phase 1), Construction Phase (Phase 2) and Operation Phase (Phase 3). Currently, the project is under the Construction Phase. This document presents the following results of the research and development performed in 2006 fiscal year, as a part of the Construction Phase based on the MIU Master Plan updated in 2002, (1) Investigation at the MIU Construction Site, (2) Construction at the MIU Construction Site, (3) Research Collaboration.
Nishio, Kazuhisa; Matsuoka, Toshiyuki; Mikake, Shinichiro; Tsuruta, Tadahiko; Amano, Kenji; Oyama, Takuya; Takeuchi, Ryuji; Saegusa, Hiromitsu; Hama, Katsuhiro; Yoshida, Haruo*; et al.
JAEA-Review 2008-073, 99 Pages, 2009/03
JAEA-Review-2008-073-1.pdf:37.33MBJAEA-Review-2008-073-2.pdf:37.16MB
Japan Atomic Energy Agency (JAEA) at Tono Geoscience Center (TGC) is developing a geoscientific research project named Mizunami Underground Research Laboratory (MIU) project in crystalline rock environment in order to establish scientific and technological basis for geological disposal of HLW. Geoscientific research at MIU is planned to be carried out in three phases over a period of 20 years; Surface-based Investigation Phase (Phase 1), Construction Phase (Phase 2) and Operation Phase (Phase 3). Currently, the project is under the Construction Phase. This document presents the following results of the research and development performed in 2005 fiscal year, as a part of the Construction Phase based on the MIU Master Plan updated in 2002, (1) Investigation at the MIU Construction Site, (2) Construction at the MIU Construction Site, (3) Research Collaboration.
Hasegawa, Ken; Kunitomo, Takahiro; Nakajima, Takahiro; Kumazawa, Mineo*; Kuroda, Hidetaka*; Iyatomi, Yosuke; Asai, Hideaki; Matsui, Hiroya
JAEA-Evaluation 2008-002, 60 Pages, 2009/03
JAEA-Evaluation-2008-002.pdf:4.92MB
We considered the ACROSS(Accurately Controlled Routinely Operated Signal System)technology may apply to the engineering technology of the MIU project, for example monitoring of the change of the geological environment around shafts and also the strength of the shaft concrete itself. It is planned that the examination for three years will be made from fiscal year 2007. The first year is expansion of the network of observation stations, the second year is data acquisition and last year is the analysis of data and evaluation of the ACROSS. In this report, we describe the results of fundamental studies of the ACROSS and the preparation of the ACROSS observation stations, performed in fiscal year 2007.
Shibuya, Hitoshi*; Suzuki, Takashi*; Kuroda, Hidetaka
JAEA-Research 2008-052, 138 Pages, 2008/07
JAEA-Research-2008-052.pdf:43.42MB
The soundness of the design of the support system for shafts and galleries and the effects of pre- and post-excavation grouting have been assessed to confirm the proposed technical solutions at the Mizunami Underground Research Laboratory. For this purpose, design of the shafts above 1,000 m depth and the galleries above 500 m depth has been improved and grouting effects around the shafts has been calculated by means of seepage flow analysis. Additionally, analytical investigations on the concrete lining with respect to the influence of water pressure have been performed.
Shibuya, Hitoshi*; Suzuki, Takashi*; Kuroda, Hidetaka
JAEA-Research 2008-027, 274 Pages, 2008/03
JAEA-Research-2008-027-01.pdf:17.64MBJAEA-Research-2008-027-02.pdf:41.84MB
Initial design of shafts and tunnels of the Mizunami Underground Research Laboratory was done in FY2002, and preliminary analysis of those of 0 to 300 m depth was done in FY2003 on the basis of geological survey results obtained then. We have recently completed boring of MIZ-1 borehole and obtained geological data to the depth of 1,000 m. In order to confirm validity of the design, we have reviewed geological model, rock property, initial stress and other characteristics and conducted corrective analysis (two-dimensional) on the basis of the new data. In junction of shaft and sub-stage (horizontal tunnel) (100 m and 300 m depth) where stress might be concentrated, three-dimensional analysis was done.
Nishio, Kazuhisa; Mizuno, Takashi; Oyama, Takuya; Nakama, Shigeo; Saegusa, Hiromitsu; Takeuchi, Ryuji; Amano, Kenji; Tsuruta, Tadahiko; Hama, Katsuhiro; Iyatomi, Yosuke; et al.
JAEA-Review 2007-038, 31 Pages, 2007/12
JAEA-Review-2007-038.pdf:11.5MB
Japan Atomic Energy Agency (JAEA) at Tono Geoscience Center (TGC) is developing a geoscientific research project named Mizunami Underground Research Laboratory (MIU) in crystalline rock environment in order to establish scientific and technological basis for geological disposal of HLW. Geoscientific research at MIU is planned to be carried out in three Phases over a period of 20 years; Surface-based Investigation Phase (Phase 1), Construction Phase (Phase 2) and Operation Phase (Phase 3). Currently, the Project is under the Construction Phase. This document presents the following 2007 fiscal year plan of the Construction Phase based on the MIU Master Plan updated in 2002, (1)Investigation Plan at the MIU Construction Site, (2)Construction Plan at the MIU Construction Site, (3)Research Collaboration Plan.
Nishio, Kazuhisa; Mizuno, Takashi; Oyama, Takuya; Nakama, Shigeo; Saegusa, Hiromitsu; Takeuchi, Ryuji; Amano, Kenji; Tsuruta, Tadahiko; Hama, Katsuhiro; Iyatomi, Yosuke; et al.
JAEA-Review 2007-037, 29 Pages, 2007/12
JAEA-Review-2007-037.pdf:13.06MB
Japan Atomic Energy Agency (JAEA) at Tono Geoscience Center (TGC) is developing a geoscientific research project named Mizunami Underground Research Laboratory (MIU) in crystalline rock environment in order to establish scientific and technological basis for geological disposal of HLW. Geoscientific research at MIU is planned to be carried out in three Phases over a period of 20 years; Surface-based Investigation Phase (Phase 1), Construction Phase (Phase 2) and Operation Phase (Phase 3). Currently, the Project is under the Construction Phase. This document presents the following 2006 fiscal year plan of the Construction Phase based on the MIU Master Plan updated in 2002, (1)Investigation Plan at the MIU Construction Site, (2)Construction Plan at the MIU Construction Site, (3)Research Collaboration Plan.
Kuji, Masayoshi; Sato, Toshinori; Mikake, Shinichiro; Kuroda, Hidetaka
Dai-42-Kai Jiban Kogaku Kenkyu Happyokai Happyo Koenshu (CD-ROM), p.105 - 106, 2007/07
Two deep shafts at Mizunami URL are under construction at Mizunami City. To estimate the rock mass quality and UCS on shaft wall, existent rock mass classification methods (CRIEPI, RMR and New-JH) and in-situ needle sounding tests were applied in sedimentary rock to GL. -50 m depth. However, drawbacks were predicted when using these rock mass classification methods. A new quantitative rock mass classification method based on JGS standard, UCS, fracture spacing and CRIEPI classes, was developed. This method showed good suitability to sedimentary rock. Afterward, the method was applied to GL. -168 m and its suitability was confirmed.
Saegusa, Hiromitsu; Seno, Yasuhiro; Nakama, Shigeo; Tsuruta, Tadahiko; Iwatsuki, Teruki; Amano, Kenji; Takeuchi, Ryuji; Matsuoka, Toshiyuki; Onoe, Hironori; Mizuno, Takashi; et al.
JAEA-Research 2007-043, 337 Pages, 2007/03
JAEA-Research-2007-043.pdf:28.14MB
The Mizunami Underground Laboratory (MIU) Project is a comprehensive research project investigating the deep underground environment within crystalline rock being conducted by Japan Atomic Energy Agency at Mizunami City in Gifu Prefecture, central Japan. This report summarizes the results of the Surface-based Investigation Phase, identifies future issues and provides direction for research to be conducted during Construction Phase and Operation Phase. The results compiled in this report will be utilized for the technical knowledge base on geological disposal of HLW, and can be used to enhance the technical basis for waste disposal in general and for development of government regulations.
Nobuto, Jun*; Fukuda, Kazuhiro*; Sato, Toshinori; Kuroda, Hidetaka
Tonneru Kogaku Hokokushu (CD-ROM), 16, p.1 - 8, 2006/11
In this paper, we examine the mechanical behavior of shaft excavated by short-step sinking method, as part of the researches to verify the applicability of engineering technologies. Concretely, the shaft behavior during excavation is analyzed with FEM to estimate the deformation and stress state of rock mass and concrete lining support. Next, we actually measure rock mass deformation around the shaft and compare them with FEM analysis results. In addition, we apply inverse analysis method to short step sinking shaft in order to understand the shaft behavior better, and finally summarize the technological points to enhance the accuracy of inverse analysis method.
Sato, Toshinori; Mikake, Shinichiro; Kuji, Masayoshi; Kuroda, Hidetaka
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Kuji, Masayoshi; Mikake, Shinichiro; Kuroda, Hidetaka; Sugihara, Kozo; Sato, Toshinori
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Kuroda, Hidetaka; Kuji, Masayoshi; Mikake, Shinichiro; Matsui, Hiroya
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Kuji, Masayoshi; Mikake, Shinichiro; Kuroda, Hidetaka; Matsui, Hiroya
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Kuji, Masayoshi; Mikake, Shinichiro; Kuroda, Hidetaka; Matsui, Hiroya
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Kusano, Takashi*; Tamura, Hideyuki*; Yahagi, Ryoji*; Ushida, Kazuhito*; Nobuto, Jun*; Kuroda, Hidetaka; Hara, Masato; Takeuchi, Shinji; Matsui, Hiroya; Yamamoto, Masaru; et al.
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Nobuto, Jun*; Matsui, Hiroya; Mikake, Shinichiro; Kusano, Takashi*; Kuroda, Hidetaka*
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