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Hosoya, Shinichi*; Kunimaru, Takanori; Shibano, Kazunori
JAEA-Research 2008-088, 78 Pages, 2009/01
JAEA-Research-2008-088.pdf:16.02MB
Spectral analyses of the groundwater pressure data which has been monitored in the boreholes; HDB-3, 6, 7 and 8, were carried out to estimate formation properties and remove the components of response to atmospheric pressure fluctuation and earth tide from time series. The results revealed that groundwater pressure at the all intervals responds to atmospheric pressure but does not respond to earth tide at all above the resolution of measurements. Specific storage, vertical hydraulic conductivity and shear modulus were estimated from the response to atmospheric loading and compared with the data obtained in the laboratory experiments.
Kurikami, Hiroshi; Takeuchi, Ryuji; Yabuuchi, Satoshi; Seno, Shoji*; Tomura, Goji; Shibano, Kazunori; Hara, Minoru; Kunimaru, Takanori
Doboku Gakkai Rombunshu, C, 64(3), p.680 - 695, 2008/09
Japan Atomic Energy Agency has been conducting the Horonobe Underground Research Laboratory (URL) project in Horonobe, Hokkaido, as a part of the research and development program on geological disposal of high-level radioactive waste. This paper shows the results of hydrogeological investigations in the surface-based investigation phase of the project. Hydrological and meteorological investigations show that the infiltration rates of the drainage basins varies and that the infiltration rate depends on the flora and the topography. The hydraulic tests using the deep boreholes reveals that hydraulic conductivity of the scale of a few decameters to a hundred meter varies widely and decreases with depth in the same formation, while the laboratory hydraulic tests suggest that hydraulic conductivity of the intact rock is influenced by the stress history. The hydraulic tests and the long-term monitorings of hydraulic pressure clarify relatively high pressure in the deep underground. Furthermore, groundwater flow analysis shows that the groundwater in and around the URL area flows regionally from the east to the west and depends locally on the geography and geology.
Shibano, Kazunori; Orukawa, Go*; Yasue, Kenichi; Funaki, Hironori; Kurikami, Hiroshi
JAEA-Research 2008-033, 27 Pages, 2008/06
JAEA-Research-2008-033.pdf:2.33MB
The hydrogeological model of shallow zone was built by using the data of core observation and permeability tests in the shallow boreholes drilled prior to the shaft excavation. Then, groundwater flow analysis of shaft excavation was performed using the hydrogeological model. By making a comparison between inflow rate into the shaft obtained by the analysis and measured inflow rate to the depth of 50m, the hydrogeological model and the performance of the cut-off wall established around the shaft were evaluated. The prediction analysis showed that the cut-off wall was the adequate performance and the hydraulic conductivity of fresh rock in the Koetoi Formation directly influenced the inflow rate below the cut-off wall. The simplified model in the report is efficient to reflect the excavation execution of the underground facility.
Tomura, Goji; Kurikami, Hiroshi; Shibano, Kazunori; Kunimaru, Takanori; Hara, Minoru
JAEA-Research 2007-063, 46 Pages, 2007/11
JAEA-Research-2007-063.pdf:8.1MB
Horonobe Underground Research Center of Japan Atomic Energy Agency has been investigating surface hydrogeological features in and around the Horonobe Underground Research Laboratory (URL) area as a part of Horonobe URL project. In the surface hydrogeological investigation, for the purpose of understanding of groundwater recharge rate and groundwater flow in the shallower part, which are required for the setting of boundary and initial condition of the groundwater flow analysis, meteorological observations, observation of river flux and water quality, soil moisture observation, groundwater level observation, etc are being continued. This report shows present status and results of surface hydrogeological investigation in the Horonobe URL project.
Kunimaru, Takanori; Shibano, Kazunori; Kurikami, Hiroshi; Tomura, Goji; Hara, Minoru; Yamamoto, Hajime*
JAEA-Data/Code 2007-015, 113 Pages, 2007/11
JAEA-Data-Code-2007-015.pdf:6.62MB
In the Horonobe Underground Research Laboratory (URL) Project, ground water from boreholes, river water and precipitation have been preiodically analyzed for the environmental monitoring since the fiscal year 2001. This report shows the data set of water chemistry since the fiscal year 2001 to the fiscal year 2006.
Ota, Kunio; Abe, Hironobu; Yamaguchi, Takehiro; Kunimaru, Takanori; Ishii, Eiichi; Kurikami, Hiroshi; Tomura, Goji; Shibano, Kazunori; Hama, Katsuhiro; Matsui, Hiroya; et al.
JAEA-Research 2007-044, 434 Pages, 2007/03
JAEA-Research-2007-044.pdf:54.58MBJAEA-Research-2007-044(errata).pdf:0.08MB
The Horonobe URL Project started in 2000. Research and development activities are planned over three phases, that will span a total duration of about 20 years: the 1st surface-based investigarion phase (6 years), the 2nd URL construction phase (8 years) and rhe 3rd operation phase (12 years). Geological, geophysical, geo-mechanical, hydrogeological, and hydro-geochemical investigations have been carried out during the surface-based investigation.
Sanada, Hiroyuki; Hanakawa, Toshiyuki; Ota, Kunio; Abe, Hironobu; Yamaguchi, Takehiro; Kunimaru, Takanori; Ishii, Eiichi; Kurikami, Hiroshi; Tomura, Goji; Shibano, Kazunori; et al.
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no abstracts in English
Maekawa, Keisuke; Shibano, Kazunori; Kurikami, Hiroshi
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no abstracts in English
Tomura, Goji; Maekawa, Keisuke; Kurikami, Hiroshi; Shibano, Kazunori; Kunimaru, Takanori; Hara, Minoru
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no abstracts in English
Kunimaru, Takanori; Ota, Kunio; Abe, Hironobu; Yamaguchi, Takehiro; Ishii, Eiichi; Kurikami, Hiroshi; Tomura, Goji; Shibano, Kazunori; Hama, Katsuhiro; Matsui, Hiroya; et al.
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The Horonobe Underground Research Laboratory (URL) Project is being pursued by the Japan Atomic Energy Agency (JAEA) to enhance the reliability of relevant disposal technologies through investigations of the deep geological environment within the host sedimentary formations at Horonobe, northern Hokkaido. The project consists of two major research areas, "Geoscientific Research" and "R&D on Geological Disposal", and proceeds in three overlapping phases, "Phase I: Surface-based investigation", "Phase II: Construction" and "Phase III: Operation", over a period of 20 years. The present report summarises the results of the Phase I geoscientific research carried out from March 2001 to March 2005. Integration of work from different disciplines into a "geosynthesis" ensures that the Phase I goals have been successfully achieved and identifies key issues that need to be addressed in the Phase II/III investigations.
