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Sasao, Eiji; Suzuki, Keiichi*; Yamada, Nobuto*; Kuboshima, Koji*
Proceedings of 12th SEGJ International Symposium (USB Flash Drive), 4 Pages, 2015/11
We performed investigation of a fault with thick and clay-altered damaged zone in granitic rock using cosmic ray muons at the Mizunami Underground Research Laboratory. Geology of the Laboratory consists of sedimentary rock and underlying granite with unconformable contact at the 170 meters below ground level (G.L.). A vertical fault with a thick, clay-altered damaged zone is present in the granite. The muon telescopes were settled at the G.L.-200 and -300 meters to estimate densities of granite and fault. Densities of granite, fault and sedimentary rock are calculated as 3.38, 2.88 and 1.99 g/cm
, respectively. The obtained density is obviously higher than absolute value, though the reason of such difference is not clear at the moment. If the density of granite is assumed to be 2.6 g/cm, then the densities of fault and sedimentary rock are re-calculated as 2.2 and 1.5 g/cm. This result indicates that cosmic ray muons have good potential to detect geological structure.
Kawamoto, Koji; Kuboshima, Koji*; Murakami, Hiroaki; Ishibashi, Masayuki; Sasao, Eiji
JAEA-Research 2014-021, 30 Pages, 2014/11
JAEA-Research-2014-021.pdf:6.79MB
The MIU (Mizunami Underground Research Laboratory) Project has three overlapping phases, Surface-based investigation phase (Phase I), Construction phase (Phase II), and Operation phase (Phase III). Currently, the project is under Phase II and Phase III. One of Phase II goals is set up to develop and revise models of the geological environment using the investigation results obtained during excavation, and to determine and assess changes in the geological environment in response to excavation. This report aims at compiling results of study on geology and geological structure at the -500m Stage in the MIU construction site, investigated in the Phase II and provides the fundamental information on the geology and geological structure for future study and modeling of geological environment.
Ishibashi, Masayuki; Sasao, Eiji; Kuboshima, Koji; Matsuoka, Toshiyuki
JAEA-Research 2013-019, 31 Pages, 2013/11
JAEA-Research-2013-019.pdf:11.64MB
Japan Atomic Energy Agency at Tono Geoscience Center is developing a geoscientific research project named the 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; Surface-based Investigation Phase (Phase 1), Construction Phase (Phase 2) and Operation Phase (Phase 3). Currently, the project is under the Construction Phase (Phase 2) and the Operation Phase (Phase 3). In the phase 2, the geological models have been updated six times (Shaft180, Pilot500, Substage200, Stage300, Shaft460 and Shaft500 geological model) based on the increasing data. The updating result from Shaft180 geological model to Stage300 geological model was already published. Thus this document mainly describes Shaft460 and Shaft500 geological models at the Phase 2.
Tsuruta, Tadahiko; Sasao, Eiji; Kawamoto, Koji; Kuboshima, Koji; Ishibashi, Masayuki
JAEA-Research 2013-014, 35 Pages, 2013/11
JAEA-Research-2013-014.pdf:12.15MB
JAEA is performing the Mizunami Underground Research Laboratory (MIU) Project in order to establish comprehensive techniques for the investigation, analysis and assessment of the deep geological environment in the fractured crystalline rock. The Project has three overlapping phases with a total duration of about 20 years, and is under the Phase II (Construction phase) and the Phase III (Operation phase). One of the Phase II goals is set up to develop and revise models of the geological environment using the investigation results, and to determine and assess changes in the geological environment in response to excavation. This report aims compiling the study on geology and geological structure from G.L. -300m to G.L. -500m, excavated in the fiscal years from FY2008 to FY2012, and provides the fundamental information on the geology and geological structure for future study and modelling of geological environment. The compiling data are utilized in the updating of the geological models.
Kuboshima, Koji; Ishibashi, Masayuki; Sasao, Eiji; Tsuruta, Tadahiko; Tagami, Masahiko*; Yuguchi, Takashi
JAEA-Research 2012-037, 78 Pages, 2013/03
JAEA-Research-2012-037.pdf:235.85MB
The MIU (Mizunami Underground Research Laboratory) Project has three overlapping phases, Surface-based investigation phase (Phase I), Construction phase (Phase II), and Operation phase (Phase III). Currently, the project is under Phase II and Phase III. One of Phase II goals is set up to develop and revise models of the geological environment using the investigation results obtained during excavation, and to determine and assess changes in the geological environment in response to excavation. This report aims compiling results of study on geology and geological structure from the surface to G.L. -300m in the Phase II and provides the fundamental information on the geology and geological structure for future study. The compiling results of this report reflected basic data are utilized in the updating of the geological models in the Phase II.
Kawamoto, Koji; Kuboshima, Koji; Ishibashi, Masayuki; Tsuruta, Tadahiko; Sasao, Eiji; Ikeda, Koki; Mikake, Shinichiro; Hara, Ikuo; Yamamoto, Masaru
JAEA-Data/Code 2012-025, 32 Pages, 2013/01
JAEA-Data-Code-2012-025.pdf:3.03MB
JAEA-Data-Code-2012-025-appendix.zip:126.32MB
This document presents the data of geological investigations in the shafts and research galleries from the depth of 300m to 500m of the MIU from the 2008 fiscal year to the 2011 fiscal year. In the shafts and research galleries of the MIU, although the Cretaceous Toki granite is distributed, pegmatite, aplite and lampropyre dike are distributed partially.
Kunimaru, Takanori; Mikake, Shinichiro; Nishio, Kazuhisa; Tsuruta, Tadahiko; Matsuoka, Toshiyuki; Ishibashi, Masayuki; Kuboshima, Koji; Takeuchi, Ryuji; Mizuno, Takashi; Sato, Toshinori; et al.
JAEA-Review 2012-028, 31 Pages, 2012/08
JAEA-Review-2012-028.pdf:3.86MB
Japan Atomic Energy Agency (JAEA) at Tono Geoscience Center (TGC) is pursuing a geoscientific research and development project namely the Mizunami Underground Research Laboratory (MIU) project in crystalline rock environment in order to construct scientific and technological basis for geological disposal of High-level Radioactive Waste (HLW). The MIU project is planned in three overlapping phases; Surface-based Investigation Phase (Phase I), Construction Phase (Phase II) and Operation Phase (Phase III). Currently, the project is under the Construction Phase and the Operation Phase. This document introduces the research and development activities planned for 2012 fiscal year based on the MIU Master Plan updated in 2010, construction plan and research collaboration plan, etc.
Kawamoto, Koji; Kuboshima, Koji; Ishibashi, Masayuki; Tsuruta, Tadahiko; Sasao, Eiji; Ikeda, Koki; Mikake, Shinichiro; Hara, Ikuo; Yamamoto, Masaru
JAEA-Data/Code 2012-009, 47 Pages, 2012/07
JAEA-Data-Code-2012-009.pdf:3.7MBJAEA-Data-Code-2012-009-appendix(DVD-ROM)-1.zip:236.07MBJAEA-Data-Code-2012-009-appendix(DVD-ROM)-2.zip:615.87MBJAEA-Data-Code-2012-009-appendix(DVD-ROM)-3.zip:45.88MBJAEA-Data-Code-2012-009-appendix(DVD-ROM)-4.zip:115.54MBJAEA-Data-Code-2012-009-appendix(DVD-ROM)-5.zip:230.55MB
This document presents the data of geological investigations in the shafts and research galleries to the depth of 300 m of the MIU from the 2004 fiscal year to the 2008 fiscal year. In the shafts and research galleries of the MIU, the Cretaceous Toki granite is unconformably overlain by the generally flat lying Miocene Mizunami Group (younging upwards from the Toki Lignite-bearing Formation to the Hongo and Akeyo Formations) with a depth of about 166 m to 168 m.
Ueno, Takashi; Tokuyasu, Shingo; Kawamoto, Koji; Kuboshima, Koji; Ishibashi, Masayuki; Tsuruta, Tadahiko; Sasao, Eiji; Ikeda, Koki; Mikake, Shinichiro; Hara, Ikuo; et al.
JAEA-Data/Code 2012-008, 136 Pages, 2012/07
JAEA-Data-Code-2012-008.pdf:27.39MBJAEA-Data-Code-2012-008(errata).pdf:1.55MBJAEA-Data-Code-2012-008-appendix(DVD-ROM)-1.zip:790.9MBJAEA-Data-Code-2012-008-appendix(DVD-ROM)-2.zip:834.48MBJAEA-Data-Code-2012-008-appendix(DVD-ROM)-3.zip:533.98MBJAEA-Data-Code-2012-008-appendix(DVD-ROM)-4.zip:712.56MBJAEA-Data-Code-2012-008-appendix(DVD-ROM)-5.zip:525.5MB
This report compiles data of results from borehole investigations which has been carried out research gallery of Mizunami Underground Research Laboratory (MIU) in the fiscal year from 2005 to 2011. These data include results of core observation, geophysical logging, and so on.
Otani, Tomoyuki*; Okazaki, Kazunari*; Nishimura, Yuki*; Kojima, Satoru*; Kuboshima, Koji; Sasao, Eiji; Tsuruta, Tadahiko
no journal, ,
no abstracts in English
Sasao, Eiji; Yamada, Nobuto; Kuroiwa, Hiroshi; Kuboshima, Koji; Kawamoto, Koji; Ishibashi, Masayuki; Tsuruta, Tadahiko; Matsuoka, Toshiyuki; Murakami, Hiroaki
no journal, ,
no abstracts in English
Otani, Tomoyuki*; Okazaki, Kazunari*; Nishimura, Yuki*; Kojima, Satoru*; Kuboshima, Koji; Tsuruta, Tadahiko; Sasao, Eiji
no journal, ,
no abstracts in English
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.
Otani, Tomoyuki*; Yokoi, Kosuke*; Okazaki, Kazunari*; Nishimura, Yuki*; Kojima, Satoru*; Kuboshima, Koji*; Sasao, Eiji
no journal, ,
The orientation of microcracks was measured using the MIU-3 core penetrating the Tsukiyoshi fault to clarify the relation of the microcrack distribution near the fault. Attitude of microcracks in quartz grains in granite are measured under the optical microscope with the universal stage using three perpendicular thin sections. The healed microcracks was probably formed prior to the sealed microcracks. Both healed and sealed microcracks with moderate dip appears near the fault. The distribution of microcracks with moderate dip shows that the preferred orientation of microcracks near the fault is different from that far from the fault. The distribution of the sealed microcracks with moderate dip is narrower than that of the healed microcracks. This shows that the healed microcracks with moderate dip was developed in the intact granite at the earlier stage of the faulting history, and the sealed microcracks was in the weak fault zone which has repeated rupturing and healing at the later.
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.
Sasao, Eiji; Yamada, Nobuto*; Suzuki, Keiichi*; Kuboshima, Koji*
no journal, ,
We performed investigation of fault with thick and clay-altered damaged zone in granitic rock used by cosmic ray muons at the Mizunami Underground Research Laboratory. Geology of investigated site consists of sedimentary sequence and underlying granite with unconformable contact at the 170 meters below ground level (G.L.). A fault with thick and clay-altered damaged zone is vertically distributed in granite. The muon telescopes were settled at the G.L.-200 and -300 meters to estimate densities of granite and fault. Densities of granite, fault and sedimentary rock are calculated as 3.38, 2.88 and 1.99 g/cm, respectively. The obtained density is obviously higher than absolute value, though the reason of such difference is not clear at the moment. If the density of granite is assumed to be 2.6 g/cm, then the densities of fault and sedimentary rock are re-calculated as 2.2 and 1.5 g/cm. This result indicates that cosmic ray muons have good potential to detect geological structure.
Oizumi, Ryo*; Kato, Takeshi*; Kiho, Kenzo*; Kuboshima, Koji*; Miyara, Nobukatsu
no journal, ,
no abstracts in English
Kuboshima, Koji; Sasao, Eiji
no journal, ,
no abstracts in English
Otani, Tomoyuki*; Okazaki, Kazunari*; Nishimura, Yuki*; Kojima, Satoru*; Kuboshima, Koji; Sasao, Eiji; Tsuruta, Tadahiko
no journal, ,
no abstracts in English
Kuboshima, Koji
no journal, ,
no abstracts in English