scholarly journals Characterization and Tectonic Significance of Low-Angle Fracture Distribution in the Upper Part of a Granite Body-New Insight from the Toki Granite around the Mizunami Underground Research Laboratory (MIU), Central Japan-

2008 ◽  
Vol 124 (12) ◽  
pp. 710-718 ◽  
Author(s):  
Arata KURIHARA ◽  
Kenji AMANO ◽  
Chunxue LIU ◽  
Katsuaki KOIKE
Keyword(s):  
Research Laboratory ◽  
Central Japan ◽  
Granite Body ◽  
Angle Fracture ◽  
Tectonic Significance ◽  
Underground Research Laboratory ◽  
Fracture Distribution

Geomicrobiological Properties of Ultra-Deep Granitic Groundwater from the Mizunami Underground Research Laboratory (MIU), Central Japan

2010 ◽  
Vol 60 (1) ◽  
pp. 214-225 ◽  
Author(s):  
Akari Fukuda ◽  
Hiroki Hagiwara ◽  
Toyoho Ishimura ◽  
Mariko Kouduka ◽  
Seiichiro Ioka ◽  
...  
Keyword(s):  
Research Laboratory ◽  
Central Japan ◽  
Underground Research Laboratory ◽  
Granitic Groundwater

Mizunami Underground Research Laboratory in Japan: Pre-Excavation Site Characterization and Influence on Design Concepts

2001 ◽  
Author(s):  
Glen F. McCrank ◽  
Kenji Amano ◽  
Kaoru Koide ◽  
Hiroya Matsui ◽  
Shinichiro Mikake ◽  
...  
Keyword(s):  
Research Laboratory ◽  
Conceptual Models ◽  
Site Characterization ◽  
Geological Environment ◽  
Central Japan ◽  
Design Concepts ◽  
Experimental Programme ◽  
Nuclear Cycle ◽  
Underground Research Laboratory ◽  
Excavation Site

Abstract The Mizunami Underground Research Laboratory (MIU) will be constructed by the Japan Nuclear Cycle Development Institute (JNC) in central Japan. The project is planned in three overlapping phases consisting of I) Surface-based Investigation II) Construction and III) Operations Phases. This paper addresses the methods used to investigate the geological environment, the integration of the site knowledge into conceptual models and the application of the knowledge in designing the facility; some aspects of the future experimental programme are discussed.

Hydrogeological Characterization on Surface-Based Investigation Phase in the Mizunami Underground Research Laboratory Project, in Japan

2007 ◽  
Author(s):  
Hiromitsu Saegusa ◽  
Hironori Onoe ◽  
Shinji Takeuchi ◽  
Ryuji Takeuchi ◽  
Takuya Ohyama
Keyword(s):  
Phase I ◽  
Research Laboratory ◽  
Phase Iii ◽  
Geological Environment ◽  
Hydrogeological Model ◽  
Central Japan ◽  
Energy Agency ◽  
Flow Simulations ◽  
Underground Research Laboratory ◽  
Operation Phase

The Mizunami Underground Research Laboratory (MIU) project is being carried out by Japan Atomic Energy Agency in the Cretaceous Toki granite in the Tono area, central Japan. The MIU project is a purpose-built generic underground research laboratory project that is planned for a broad scientific study of the deep geological environment as a basis of research and development for geological disposal of nuclear wastes. One of the main goals of the MIU project is to establish comprehensive techniques for investigation, analysis, and assessment of the deep geological environment. The MIU project has three overlapping phases: Surface-based Investigation (Phase I), Construction (Phase II) and Operation (Phase III). Hydrogeological investigations using a stepwise process in Phase I have been carried out in order to obtain information on important properties such as, location of water conducting features, hydraulic conductivity and so on. Hydrogeological modeling and groundwater flow simulations in Phase I have been carried out in order to synthesize these investigation results, to evaluate the uncertainty of the hydrogeological model and to identify the main issues for further investigations. Using the stepwise hydrogeological characterization approach and combining the investigation with modeling and simulation, understanding of the hydrogeological environment has been progressively improved.

Low Alkaline Cement Used in the Construction of a Gallery in the Horonobe Underground Research Laboratory

2010 ◽  
Author(s):  
Masashi Nakayama ◽  
Haruo Sato ◽  
Yutaka Sugita ◽  
Seiji Ito ◽  
Masashi Minamide ◽  
...  
Keyword(s):  
Fly Ash ◽  
Research Laboratory ◽  
Concrete Lining ◽  
Energy Agency ◽  
Tunnel Support ◽  
Long Term Stability ◽  
Alkaline Conditions ◽  
High Level ◽  
Underground Research Laboratory

In Japan, any high level radioactive waste (HLW) repository is to be constructed at over 300 m depth below surface. Tunnel support is used for safety during the construction and operation, and shotcrete and concrete lining are used as the tunnel support. Concrete is a composite material comprised of aggregate, cement and various admixtures. Low alkaline cement has been developed for the long term stability of the barrier systems whose performance could be negatively affected by highly alkaline conditions arising due to cement used in a repository. Japan Atomic Energy Agency (JAEA) has developed a low alkaline cement, named as HFSC (Highly Fly-ash Contained Silicafume Cement), containing over 60 wt% of silica-fume (SF) and fly-ash (FA). HFSC was used experimentally as the shotcrete material in construction of part of the 140m deep gallery in the Horonobe Underground Research Laboratory (URL). The objective of this experiment was to assess the performance of HFSC shotcrete in terms of mechanics, workability, durability, and so on. HFSC used in this experiment is composed of 40 wt% OPC (Ordinary Portland Cement), 20 wt% SF, and 40 wt% FA. This composition was determined based on mechanical testing of various mixes of the above components. Because of the low OPC content, the strength of HFSC tends to be lower than that of OPC. The total length of tunnel using HFSC shotcrete is about 73 m and about 500 m3 of HFSC was used. The workability of HFSC shotcrete was confirmed in this experimental construction.

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