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Kuji, Masayoshi*; Asai, Hideaki*; Hashizume, Shigeru; Horiuchi, Yasuharu; Sato, Toshinori; Matsui, Hiroya
JAEA-Technology 2013-022, 72 Pages, 2013/10
JAEA-Technology-2013-022.pdf:5.3MB
Rock mass classifications are used for design and construction of underground structures. However, the classification methods commonly used in Japan are qualitative and inadequate for estimating the actual mechanical properties of a rock mass based on site specific geological features. Considering the design, construction and safe operation of large underground facilities, an important requirement is to utilize a rock mass classification method that can estimate site specific rock mechanical properties based on surface-based investigations and geological observations during excavation. For this study, a new quantitative rock mass classification method based on JGS standard was proposed and applied to the sedimentary formations and the granite at MIU. The results were compared with the rock mass classification system developed by CRIEPI and commonly used in JAPAN. Then the applicability of the new rock mass classification could be evaluated.
Tanaka, Toshiyuki*; Miyajima, Rikio*; Asai, Hideaki*; Horiuchi, Yasuharu; Kumada, Koji; Asai, Yasuhiro*; Ishii, Hiroshi*
Earth Planets and Space, 65(2), p.59 - 66, 2013/02
Times Cited Count：9 Percentile：23.68(Geosciences, Multidisciplinary)Hasegawa, Ken; Kunitomo, Takahiro; Nakajima, Takahiro*; Asai, Hideaki*; Iyatomi, Yosuke; Matsui, Hiroya
JAEA-Evaluation 2011-001, 150 Pages, 2011/06
JAEA-Evaluation-2011-001.pdf:28.92MB
ACROSS has developed to acquire the detailed information on the tectonically active zone. The technology for example the transmission and receiving technique, the data analysis and the interpretation technique of the ACROSS signal is able to apply not only to seismology but also to other field. We considered the ACROSS 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 processing results obtained from the ACROSS observation stations which were prepared in fiscal year 2007 and 2008, also describe the current evaluation results of the ACROSS.
Asai, Hideaki; Kuji, Masayoshi*; Horiuchi, Yasuharu; Matsui, Hiroya
Dai-40-Kai Gamban Rikigaku Ni Kansuru Shimpojiumu Koen Rombunshu (CD-ROM), p.13 - 18, 2011/01
Considering the design, construction and safe operation of large underground facilities such as for the geological disposal of high-level radioactive waste, an important requirement is to utilize a rock mass classification method that can estimate site specific rock mechanical properties based on surface-based investigations and geological observations during excavation. For this study, a new quantitative rock mass classification method based on the Japanese Geotechnical Society standard was proposed and applied to the sedimentary formations and the granite at the Mizunami Underground Research Laboratory. The results were compared with the rock mass classification system developed by the Central Research Institute of Electric Power Industry and commonly used in Japan. Then the applicability of the new rock mass classification could be evaluated.
Asai, Hideaki; Hasegawa, Ken
JAEA-Review 2010-050, 222 Pages, 2010/11
JAEA-Review-2010-050.pdf:25.5MB
ACROSS (Accurately Controlled Routinely Operated Signal System) has developed to acquire the detailed information on the tectonically active zone. We considered the ACROSS 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 was planned that the examination for three years will be made from fiscal year 2007. We held ACROSS Workshop "Current state of ACROSS technology and view in the future" on February 24 and 25, 2010 at Mizunami. The purpose of the ACROSS Workshop was to introduce our current result of the ACROSS research, to introduce the research of the ACROSS technology to external specialists, and to discuss the view of the ACROSS technology in the future. This report is collection of the documents used in the ACROSS Workshop.
Asai, Hideaki; Kuji, Masayoshi*; Matsui, Hiroya
Doboku Gakkai Heisei-22-Nendo Zenkoku Taikai Dai-65-Kai Nenji Gakujutsu Koenkai Koen Gaiyoshu (DVD-ROM), p.137 - 138, 2010/09
Two deep shafts (the Main Shaft and the Ventilation Shaft) at The Mizunami Underground Research Laboratory (MIU) is currently being constructed by Japan Atomic Energy Agency (JAEA). We proposed a new quantitative rock mass classification methods based on JGS standard besides existing rock mass classification methods (CRIEPI, RMR and New-JH). Afterward, the new classification method is applied to the drift, and it reports on the result of revaluing applicability concerning the new classification method.
Kuji, Masayoshi*; Asai, Hideaki; Matsui, Hiroya
Doboku Gakkai Heisei-22-Nendo Zenkoku Taikai Dai-65-Kai Nenji Gakujutsu Koenkai Koen Gaiyoshu (DVD-ROM), p.139 - 140, 2010/09
Two deep shafts (the Main Shaft and the Ventilation Shaft) at The Mizunami Underground Research Laboratory (MIU) is currently being constructed by Japan Atomic Energy Agency (JAEA). To estimate the rock mass quality and UCS on shaft wall, existent rock mass classification methods (CRIEPI, RMR and New-JH) and in-situ Schmidt hammer tests were applied in rock. In this report, applicability for the estimation of rock strength by Schmidt hammer is discussed based on in-situ measurement data.
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.
Hasegawa, Ken; Kunitomo, Takahiro; Nakajima, Takahiro; Asai, Hideaki; Iyatomi, Yosuke; Matsui, Hiroya
JAEA-Evaluation 2009-006, 120 Pages, 2010/01
JAEA-Evaluation-2009-006.pdf:32.94MB
ACROSS (Accurately Controlled Routinely Operated Signal System) has developed to acquire the detailed information on the tectonically active zone. The technology for example the transmission and receiving technique, the data analysis and the interpretation technique of the ACROSS signal, is able to apply not only to seismology but also to other field. We considered the ACROSS 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 preliminary processing results obtained from the ACROSS observation stations which were prepared in fiscal year 2007 and 2008.
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.
Kuji, Masayoshi*; Matsui, Hiroya; Hara, Masato; Minamide, Masashi*; Mikake, Shinichiro; Takeuchi, Shinji; Sato, Toshinori*; Asai, Hideaki
JAEA-Research 2008-095, 54 Pages, 2009/01
JAEA-Research-2008-095.pdf:13.14MB
A large amount of water inflow is frequently generated during the excavation of an underground cavern, such as road and railway tunnels, underground electric facilities etc. The reduction of water inflow is sometimes quite important for the reduction of cost for the water treatment and pumping during the construction of an underground cavern. The Mizunami Underground Research Laboratory (MIU) is currently being constructed by Japan Atomic Energy Agency. During its excavation, a large amount of water inflow into the shafts has been increasing and affecting the project progress. Therefore, a field experiment of post-excavation grouting around the Ventilation Shaft in a sedimentary formation carried out to confirm the effect of existing grouting technology for sedimentary formations in MIU project. The result shows that the applied methods in this field experiment are effective to prevent water inflow. This report describes the summary of the field experiment and the knowledge obtained through the experiment.
Kuji, Masayoshi*; Asai, Hideaki; Mikake, Shinichiro; Hara, Masato
Maeda Kensetsu Gijutsu Kenkyushoho (CD-ROM), 8 Pages, 2008/09
The Mizunami Underground Research Laboratory is currently being constructed by Japan Atomic Energy Agency. During its excavation, large amount of water inflow into the shafts has been increasing and affecting the project progress. As countermeasures for reducing water inflow, grouting methods are being considered, one is post-excavation grouting for the area already excavated, and another is pre-excavation grouting for the area excavate in future. Therefore, the field experiment for post-excavation grouting was carried out, and the result show that the applied methods in this field experiment is effective to prevent the draining. And pre-excavation grouting has been undertaken and the applicability of several techniques has been evaluated. This report describes the summary of the Mizunami Underground Research Laboratory and field experiments of post- and pre-excavation grouting method.
Kusano, Takashi*; Tamura, Hideyuki*; Yahagi, Ryoji*; Ushida, Kazuhito*; Nobuto, Jun*; Kuroda, Hidetaka; Hara, Masato; Takeuchi, Shinji; Matsui, Hiroya; Yamamoto, Masaru; et al.
no journal, ,
no abstracts in English
Matsui, Hiroya; Mikake, Shinichiro; Asai, Hideaki; Sugihara, Kozo
no journal, ,
In the construction phase of the MIU project, engineering studies have focused on research into design and construction technologies for deep underground. The main subjects consist of the following: "Demonstration of the design methodology", "Demonstration of existing and supplementary excavation methods", "Demonstration of countermeasures during excavation" and "Demonstration of safe construction". In the FY 2007, identification and evaluation of the subjects for this study were carried out to optimize future research work. Specific studies have been performed as well. Based on these studies, future research focused on the four subject areas has been identified. The design methodology in the surface-based investigation phase was verified to 200 m depth. Evaluation of countermeasures and studies of concepts for the estimation of the influence of high differential water pressures, long-term maintenance and risk management have been proposed with respect to the geological disposal project.
Asai, Hideaki; Matsui, Hiroya; Mikake, Shinichiro; Sugihara, Kozo
no journal, ,
The Mizunami Underground Research Laboratory (MIU) is currently being constructed by Japan Atomic Energy Agency. As part of MIU Project, development of engineering technology for deep underground intended for the crystalline rock is executed. The research to confirm the effectiveness of engineering technology is being executed during its excavation now. It reports on the current state of engineering technology research and the schedule for the future.
Kuji, Masayoshi*; Asai, Hideaki; Matsui, Hiroya
no journal, ,
Two deep shafts (the Main Shaft and the Ventilation Shaft) at The Mizunami Underground Research Laboratory (MIU) is currently being constructed by Japan Atomic Energy Agency (JAEA). 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 rock. A new quantitative rock mass classification method based on JGS standard was developed. This method showed good suitability to sedimentary rock in the Ventilation Shaft. Afterward, the new method was applied to heterogeneous sedimentary rock in the Main Shaft.
Asai, Hideaki; Kuji, Masayoshi*; Matsui, Hiroya
no journal, ,
Two deep shafts(the Main Shaft and the Ventilation Shaft) at The Mizunami Underground Research Laboratory(MIU) is currently being constructed by Japan Atomic Energy Agency(JAEA). 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 rock. A new quantitative rock mass classification method based on JGS standard was developed. This method showed good suitability to sedimentary rock in the Ventilation Shaft. Afterward, the new method was applied to crystalline rock in the Main Shaft and the Ventilation Shaft.
Matsui, Hiroya; Asai, Hideaki; Horiuchi, Yasuharu
no journal, ,
As part of MIU (The Mizunami Underground Research Laboratory) project, development of engineering technology for deep underground intended for the crystalline rock is executed. The former research mainly aimed in this study are categorized in (1) development of design and construction planning technologies, (2) development of construction technology, (3) development of countermeasure technology, (4) development of technology for security. It reports on the current state of engineering technology research and the schedule for the future.
Asai, Hideaki; Matsui, Hiroya; Mikake, Shinichiro; Ito, Hiroaki; Horiuchi, Yasuharu; Ishii, Yoji
no journal, ,
The Mizunami Underground Research Laboratory (MIU) is currently being constructed by Japan Atomic Energy Agency. As part of MIU Project, development of engineering technology for deep underground intended for the crystalline rock is executed. The research to confirm the effectiveness of engineering technology is being executed during its excavation now. It reports on study results up to 300m in depth of engineering technology research and the schedule for the future.
Matsui, Hiroya; Mikake, Shinichiro; Asai, Hideaki; Ishii, Yoji; Horiuchi, Yasuharu; Kumada, Koji
no journal, ,
The Mizunami Underground Research Laboratory (MIU) of the Japan Atomic Energy Agency is a major site for geoscientific research to advance the scientific and technological basis for geological disposal of high-level radioactive waste in crystalline rock. Studies on relevant engineering technologies in the MIU consist of research on design and construction technology for very deep underground applications, and engineering technology as a basis of geological disposal. In the Second Phase of the MIU project, engineering studies have focused on research into design and construction technologies for deep underground. The main subjects in the study of very deep underground structures consist of the following: Demonstration of the design methodology, Demonstration of existing and supplementary excavation methods, Demonstration of countermeasures during excavation and Demonstration of safe construction. This poster show the main topics and results of the study until FY2009.
