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Keya, Hiromichi; Onoe, Hironori; Takeuchi, Ryuji
JAEA-Data/Code 2019-001, 49 Pages, 2019/03
A wide range of geoscientific research aims to establish comprehensive techniques for the investigation, analysis and assessment of the deep geological environment in fractured crystalline rock. The Regional Hydrogeological Study (RHS) project is a one of the geoscientific research program at Tono Geoscience Center. This project started since April 1992 and main investigations were finished to March 2004. Since 2005, hydrogeological and hydrochemical monitoring have been continued using the existing monitoring system. This report describes the results of the long term hydro-pressure monitoring from April 2017 to March 2018.
Keya, Hiromichi; Takeuchi, Ryuji; Iwatsuki, Teruki
JAEA-Data/Code 2018-020, 58 Pages, 2019/03
A wide range of geoscientific research aims to establish comprehensive techniques for the investigation, analysis and assessment of the deep geological environment in fractured crystalline rock. The Regional Hydrogeological Study (RHS) project is a one of the geoscientific research program at Tono Geoscience Center. This project started since April 1992 and main investigations were finished to March 2004. Since 2005, hydrogeological and hydrochemical monitoring have been continued using the existing monitoring system. This report describes the results of the long term hydro-pressure monitoring from April 2015 to March 2017.
Keya, Hiromichi; Takeuchi, Ryuji; Iwatsuki, Teruki
JAEA-Data/Code 2018-019, 107 Pages, 2019/03
The MIU Project has three overlapping phases: Surface-based Investigation phase (Phase I), Construction phase (Phase II), and Operation phase (Phase III), the project is being carried out under the Phase III. The main goals of the MIU Project from Phase I to Phase III are: to establish techniques for investigation, analysis and assessment of the deep geological environment, and to develop a base of engineering for deep underground application. One of the Phase III goals is to construct geological environment models and grasp deep geological changes when expanding the research gallery by research and investigations using research galleries. The long term hydro-pressure monitoring has been continued to achieve the Phase III goals. This report describes the results of the long term hydro-pressure monitoring from April 2015 to March 2017.
Keya, Hiromichi; Beppu, Shinji*; Takeuchi, Ryuji
JAEA-Data/Code 2018-011, 112 Pages, 2018/10
Mizunami Underground Research Laboratory (MIU) Project has three overlapping phases: Surface-based investigation phase (Phase I), Construction phase (Phase II), and Operation phase (Phase III), with a total duration of 20 years. Currently, the project is being carried out under the Phase II and the Phase III. One of the Phase II goals of Project is set to develop and revise models of the geological environment using the investigation results obtained during excavation, and determine and assess the changes in the geological environment in response to excavation. The long term hydro-pressure monitoring has been continued to achieve the Phase II goals. This paper describes the results of the long term hydro-pressure monitoring from April 2013 to March 2015.
Beppu, Shinji*; Keya, Hiromichi; Takeuchi, Ryuji
JAEA-Data/Code 2018-010, 58 Pages, 2018/10
This study aims to establish comprehensive techniques for the investigation, analysis and assessment of the deep geological environment in fractured crystalline rock. The Regional Hydrogeological Study (RHS) Project is a one of the geoscientific research program at Tono Geoscience Center. This project started since April 1992 and main investigations were finished to March 2004. Since 2005, hydrogeological and hydrochemical monitoring have been continued using the existing monitoring system. This report describes the results of the long term hydro-pressure monitoring from April 2013 to March 2015.
Karino, Tomoyuki; Keya, Hiromichi*; Takeuchi, Ryuji
JAEA-Data/Code 2011-002, 62 Pages, 2011/06
Mizunami Underground Research Laboratory (MIU) Project has three overlapping phases: Surface-based investigation phase (Phase I), Construction phase (Phase II), and Operation phase (Phase III), with a total duration of 20 years. The main goals of the MIU Project from Phase I through to Phase III are: to establish techniques for investigation, analysis and assessment of the deep geological environment, and to develop a range of engineering for deep underground application. Currently, the project is being carried out under the Phase II. One of the Phase II goals is set to develop and revise models of the geological environment using the investigation results obtained during excavation, and determine and assess the changes in the geological environment in response to excavation. The long term hydro-pressure monitoring has been continued to achieve the Phase II goals. This paper describes the results of the long term hydro-pressure monitoring from April, 2009 to March, 2010.
Karino, Tomoyuki; Keya, Hiromichi*; Takeuchi, Ryuji
JAEA-Data/Code 2011-001, 37 Pages, 2011/06
Tono Regional Hydrogeological Study (RHS) Project is a one of the geoscientific research programme at Tono Geoscience Center (TGC). This project started since April, 1992 and main investigations were finished to March 2004. Since 2005, hydrogeological and hydrochemical monitoring are continued by the existing monitoring system. This paper describes the results of the long term hydro-pressure monitoring from April, 2009 to March, 2010.
Takeuchi, Ryuji; Saegusa, Hiromitsu; Oyama, Takuya; Keya, Hiromichi; Sato, Atsuya; Kosaka, Hiroshi; Takeda, Masaki; Daimaru, Shuji; Takeuchi, Shinji
JAEA-Research 2010-018, 133 Pages, 2010/08
The Mizunami Underground Laboratory Project is a comprehensive research project investigating the deep underground environment within crystalline rock. The project goals of the project from surface-based investigation phase (Phase I) through to operation phase (Phase III) are: to establish techniques for investigation, analysis and assessment of the deep geological environment, and to develop a range of engineering for deep underground application. Currently, the project is under the construction phase (Phase II). One of the Phase II goals, which is for the project goal, was set to develop and revise models of the geological environment using the investigation results obtained during excavation, and determine and assess changes in the geological environment in response to excavation. This document presents the overview of results of the research and development on "hydrogeology" performed in fiscal year 2008, with regard to the Phase II goal.
Keya, Hiromichi; Takeuchi, Ryuji
JAEA-Data/Code 2009-031, 38 Pages, 2010/03
Tono Geoscience Center (TGC) of Japan Atomic Energy Agency (JAEA) has been conducting a wide range of geoscientific research in order to build firm scientific and technological basis for geological disposal of nuclear wastes, in order to establish comprehensive techniques for the investigation, analysis and assessment of the deep geological environment in fractured crystalline rock. One of the geoscientific research programme is a Regional Hydrogeological Study (RHS) project in the Tono region, central Japan. This project started in fiscal year 1992 and main investigations finished in fiscal year 2004. After the main investigations, hydrogeological or hydrochemical long term monitoring are continued by the existing monitoring system. This document presents the results of the hydro-pressure long term monitoring from fiscal year 2005 to fiscal year 2008.
Keya, Hiromichi; Takeuchi, Ryuji
JAEA-Data/Code 2009-030, 74 Pages, 2010/03
Tono Geoscience Center (TGC) of Japan Atomic Energy Agency (JAEA) is being performed Mizunami Underground Research Laboratory (MIU) Project. The MIU Project is under the Construction phase (Phase II). One of the Phase II goals was set to develop and revise models of the geological environment using the investigation results obtained during excavation, and determine and assess changes in the geological environment in response to excavation. The hydro-pressure long term monitoring has been continued to achieve the Phase II goals. This document presents the results of the hydro-pressure long term monitoring from fiscal year 2005 to fiscal year 2008.
Toya, Naruhisa; Takeuchi, Ryuji; Onoe, Hironori; Keya, Hiromichi
no journal, ,
At the Mizunami Underground Research Laboratory construction site in Gifu Pref., construction of two vertical shafts, each to a depth of 1000 m, began in 2003. The hydraulic groundwater pressure of the bedrock is monitoring in order to understand the change in the geological environment resulting from the shaft excavation activities. Several near-vertical faults that cross the URL site ware identified some our study. One fault (NNW fault) in particular is hydrogeologically significant groundwater flow barrier. In 2007, we drilled a borehole at 200 m depth of Shaft. This borehole is nearby the estimated NNW fault. Multi-level groundwater pressure monitoring data show significant pressure response resemble to the reverse water-level fluctuation to the drilling work. In this study, we report the usability of the significant pressure response "reverse water-level fluctuation" for estimation of the hydrogeological flow.
Keya, Hiromichi; Takeuchi, Ryuji; Toya, Naruhisa; Sato, Atsuya; Saegusa, Hiromitsu; Oyama, Takuya; Kosaka, Hiroshi
no journal, ,
no abstracts in English
Keya, Hiromichi; Takeuchi, Ryuji; Toya, Naruhisa; Sato, Atsuya; Saegusa, Hiromitsu
no journal, ,
no abstracts in English
Keya, Hiromichi; Takeuchi, Ryuji; Toya, Naruhisa; Sato, Atsuya
no journal, ,
The Mizunami Underground Laboratory (MIU) Project has Construction phase (Phase II) now. In the study on the hydrogeological that receives the object of Phase II, it aims at "Grasp of the water flow place according to drilling at shafts" and "Confirmation and update of the validity of the hydrogeological model's construction at Phase I". And one hydrogeological research is long term hydraulic pressure monitoring. It is extremely important to understand water conducting feature. In this report, it introduces the method of understanding water conducting feature from the difference of the water pressure response based on the long term hydro-pressure monitoring result when drilling at shafts.
Takeda, Masaki; Takeuchi, Ryuji; Kosaka, Hiroshi; Oyama, Takuya; Keya, Hiromichi
no journal, ,
no abstracts in English
Keya, Hiromichi; Takeda, Masaki; Takeuchi, Ryuji
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
Takayasu, Kentaro; Keya, Hiromichi; Onoe, Hironori; Takeuchi, Ryuji
no journal, ,
The reflood test which fills the part of the tunnel of depth 500m with groundwater is being put into effect for the purpose of exemplification of the recovery ability of the geological environment in the bedrock which was disturbed by construction and operation of large-scale underground facilities, and development of observation and evaluation technique of geological environment recovery at The Mizunami Underground Research Laboratory (MIU). Water pressure observation devices were installed in the tunnel and in each observation section in the surrounding bedrock, and groundwater pressure change in this test was observed. Similarity of water pressure change between the tunnel and each observation section was considered by arranging observed water pressure change data as derivative plots and focusing their shapes.
Keya, Hiromichi; Takayasu, Kentaro; Kohashi, Akio; Onoe, Hironori; Takeuchi, Ryuji
no journal, ,
no abstracts in English
Ozaki, Yusuke; Kohashi, Akio; Keya, Hiromichi; Onoe, Hironori; Takeuchi, Ryuji
no journal, ,
In Mizunami Underground Research Laboratory, groundwater recovery experiment test is performed at a part of research tunnel at 500m depth for research of recovery process of subsurface environment disturbed by construction of subsurface structure. During 2017, three times temporal decompression tests of hydraulic pressure in closure test drift keeping closed condition were conducted. We report the reproductivity of time variation of hydraulic pressure during the tests. We also report the estimation results of hydrogeological structure from the data during tests.