Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Matsui, Hiroya
no journal, ,
This report is described about main topics in "Research and development of basis for engineering technologies in deep underground" after FY2005 and future work. The main subjects of the study are Demonstration of the design methodology, Demonstration of existing and supplementary excavation methods, Demonstration of countermeasures during excavation and Demonstration of safe construction. The design methodology applied in surface-based investigation phase, used excavation method were estimated and demonstrated for excavation of shafts and drifts until 300m depth. The existing grouting technology to decrease inflow in shaft and drift was demonstrated as well. Research and development on previous main subjects will be continued with excavation of shafts and drifts in future.
Mikake, Shinichiro
no journal, ,
no abstracts in English
Ishimaru, Tsuneari
no journal, ,
no abstracts in English
Ito, Hiroaki
no journal, ,
no abstracts in English
Hioki, Kazumasa; Umeki, Hiroyuki; Osawa, Hideaki; Semba, Takeshi; Makino, Hitoshi
no journal, ,
Introduction will be made on the current status of the development of the JAEA Knowledge Management System (KMS) for the geological disposal of radioactive waste and the "CoolRep", a next generation Report on JAEA Mid-term Plan.
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.
Tanno, Takeo; Hirano, Toru; Matsui, Hiroya
no journal, ,
Japan Atomic Energy Agency (JAEA) at Tono Geoscience Center (TGC) 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 the MIU project is planned to be carried out in three phases over a period of 20 years; Surface-based Investigation Phase (Phase1), Construction Phase (Phase2) and Operation Phase (Phase3). This poster describes the results of Rock Mechanics Research at the Mizunami Underground Laboratory in Construction Phase (Phase2) of three phases. This poster describes the items of these investigations. (1) Estimation of in situ stress by stress measurements using cores (2) Determining of in-situ stress by Compact Conical-ended Borehole Overcoring (CCBO).
Hirano, Toru; Tanno, Takeo; Matsui, Hiroya
no journal, ,
This poster describes the results of collaborative studies with AIST (national institute of Advanced Industrial Science and Technology) in fiscal year 2008 on an excavation disturbed zone (EDZ) evaluation. An EDZ can be characterized by monitoring changing stress magnitude or changes in sonic velocity of the rock mass. Therefore we conducted AE/DRA monitoring surveys and monitored the variations in drill induced sonic velocities in the rock mass, including the EDZ in the rock mass around the tunnel. As a result, the methods used and the quality of the data were suitable for determination of changes in the stress field and variations in sonic velocities. The next step is further evaluation of the EDZ using these data.
Kusano, Tomohiro; Yasue, Kenichi
no journal, ,
no abstracts in English
Hasegawa, Takuma*; Nakata, Kotaro*; Tomioka, Yuichi*; Goto, Kazuyuki*; Kashiwaya, Koki*; Hama, Katsuhiro
no journal, ,
The groundwater flow velocity is one of the important items in the safety assessment for the HLW disposal. Generally, it is too difficult to measure the groundwater flow velocity directly. Therefore, to determine the groundwater age by radio active isotopes are effective. However, there are some problems to apply the metrology to the natural samples. For example, because the ratio of Carbon isotope changes by dissolving of the carbonate mineral and resolving the organic materials, the development of the technique for correcting this is needed. In this study, the groundwater ages are measured by 
He and 
C, etc. and compared these results as a joint research with Central Research Institute of Electric Power Industry.
Hama, Katsuhiro
no journal, ,
Geoscientific study has been carried out in the Tono Geoscience Center since 1986. The results obtained through the study has been published as technical reports and papers. In order to use these results as knowledge base, it is necessary to show the results as familiar form.
Yuguchi, Takashi; Tsuruta, Tadahiko; Nishiyama, Tadao*
no journal, ,
The Toki granite, a single pluton, is located in the Cretaceous Sanyo Belt in the Inner Zone of Southwest Japan. Samples collected from 19 borehole sites in the Toki granite display spatial variations in mineral assemblage, mode, bulk chemical composition and mineral composition, indicative of a zoned pluton. Based on the mode and the mineral assemblages with or without hornblende, the Toki granite can be divided into three rock facies from the margin to the interior: muscovite - biotite granite (MBG), hornblende - biotite granite (HBG) and biotite granite (BG). The ASI values (mol Al
O
/ (CaO + NaO + KO)), AlO, KO and NaO change systematically from MBG through HBG to BG, corresponding to a systematic variation from peraluminous granite in the margin to metaluminous in the interior. The Fe
/ Fe
ratios gradually increase from MBG through HBG to BG, corresponding to a systematic change from ilmenite-series in the margin to magnetite-series in the interior. Both petrography and bulk chemistry imply that (1) the chemical variation of the Toki granite is not solely due to fractional crystallization, and (2) assimilation of crustal host rocks or simultaneous intrusion of different magmas has played a significant role during the emplacement process.
Asamori, Koichi; Negi, Tateyuki; Umeda, Koji; Ninomiya, Atsushi
no journal, ,
no abstracts in English
Suzuki, Mototaka; Kokubu, Yoko; Ishimaru, Tsuneari; Nishizawa, Akimitsu*; Owaki, Yoshio*; Nishio, Tomohiro*
no journal, ,
no abstracts in English
Ninomiya, Atsushi; Kurosawa, Hideki
no journal, ,
In order to elucidate the geographical distribution of the 
He/He ratios in and around the seismic source region of the 2000 western Tottori earthquake, new helium isotope data for groundwater samples from drinking water wells were determined. The maximum He/He ratio is observed from well which is located nearest to the epicenter of the mainshock. In addition, there appears to be clear trend of decreasing He/He rations with distance away from the main trace of the estimated fault segments. These observations provide significant evidence that the source fault is associated with the leakage of the mantle volatiles within the crust to the Earth's surface. We suggest the possibility that the helium isotope can be regarded as a tool for investigation concealed active faults with no surface expression, even as water sample collected from shallow wells.
Kurihara, Arata; Tsuruta, Tadahiko; Matsuoka, Toshiyuki; Hayano, Akira; Hayakawa, Masashi; Tagami, Masahiko; Hodotsuka, Yasuyuki; Yuguchi, Takashi; Ochi, Minoru; Tokuyasu, Shingo
no journal, ,
no abstracts in English
Takeuchi, Ryuji; Saegusa, Hiromitsu; Oyama, Takuya; Kosaka, Hiroshi; Sato, Atsuya; Keya, Hiromichi; Daimaru, Shuji; Takeda, Masaki
no journal, ,
no abstracts in English
Hagiwara, Hiroki; Mizuno, Takashi; Sai, Masataka; Aosai, Daisuke; Yamamoto, Yuhei
no journal, ,
no abstracts in English
Ito, Kazumasa*; Suzuki, Yohei*; Fukuda, Akari*; Kozuka, Mariko*; Mizuno, Takashi; Hagiwara, Hiroki
no journal, ,
no abstracts in English