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JAEA Reports

Conceptual design for relocation of the underground monitoring systems to ground surface

Toya, Naruhisa*; Ogawa, Ken*; Iwatsuki, Teruki; Onuki, Kenji

JAEA-Technology 2015-023, 35 Pages, 2015/09

JAEA-Technology-2015-023.pdf:9.44MB

One of the major subjects of the ongoing geoscientific research program is the Mizunami Underground Research Laboratory (MIU) Project in the Tono area, central Japan is accumulation of knowledge about a recovery of the geological environment during and after the facility closure. Then it's necessary to plan the observation system which can use after the backfill of research tunnels. The main purpose of this report is contribution to the detailed design for relocation of the underground monitoring systems to ground surface. We discussed the restriction and requirement for the underground monitoring systems which can use after the backfill. Furthermore, we made the conceptual design for relocation of the current underground monitoring systems to ground surface.

Journal Articles

Study on connectivity of water-conducting features from the spatial changes of transmissivity based on the hydraulic packer testing data

Takeuchi, Shinji*; Sawada, Atsushi; Takeuchi, Ryuji; Daimaru, Shuji*; Toya, Naruhisa*

Dai-13-Kai Iwa No Rikigaku Kokunai Shimpojiumu Koen Rombunshu (CD-ROM), p.143 - 148, 2013/01

Transformation of transmissivity from derivative of pressure traisnet data obtained from hydraulic packer testing has applied to the testing data from fractured rock of Mizunami site Japan and Onkalo site Finland. The results show hydrogeological conceptual model for the tested area such as connectivity and continuity of the water-conducting features could be established by the proposed methodology. This method would provide useful information to the hydrogeologial and transport modeling and simulation.

Journal Articles

Study on connectivity of water-conducting features in a fractured rock based on the fluid logging and hydraulic packer testing

Takeuchi, Shinji; Takeuchi, Ryuji; Toya, Naruhisa*; Daimaru, Shuji

Proceedings of International Conference on Toward and Over the Fukushima Daiichi Accident (GLOBAL 2011) (CD-ROM), 8 Pages, 2011/12

Journal Articles

The Groundwater pressure response due to shaft excavation and its possible application for characterizing hydrogeological structure

Toya, Naruhisa; Takeuchi, Ryuji; Tokunaga, Tomochika*; Aichi, Masaatsu*

Proceedings of 36th International Association of Hydrogeologists Congress 2008 (IAH 2008) (CD-ROM), 7 Pages, 2008/10

Excavation of the Mizunami Underground Research Laboratory began in 2003. In 2006-2007, several boreholes were drilled from the shafts and the gallery at GL-200m. Several monitoring boreholes are located in the vicinity of the NNW striking fault. The data from groundwater pressure monitoring obtained at multiple depth intervals during the drilling activities show unique responses, which resemble deformation-induced effects. In this study, we report the possible application of using these hydraulic responses for characterizing the hydrogeological structures of the site.

Oral presentation

Consideration on pressure response to shaft excavation

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.

Oral presentation

Hydrogeological study of the Mizunami Underground Research Laboratory project

Keya, Hiromichi; Takeuchi, Ryuji; Toya, Naruhisa; Sato, Atsuya; Saegusa, Hiromitsu; Oyama, Takuya; Kosaka, Hiroshi

no journal, , 

no abstracts in English

Oral presentation

Study of the hydrogeological conceptual model by long-term hydraulic pressure monitoring data

Keya, Hiromichi; Takeuchi, Ryuji; Toya, Naruhisa; Sato, Atsuya; Saegusa, Hiromitsu

no journal, , 

no abstracts in English

Oral presentation

Hydrogeological investigations in Mizunami Underground Research Laboratory Project; Observation results of the "Deformation induced effect" due to the shaft excavation in Granite area

Toya, Naruhisa; Takeuchi, Ryuji

no journal, , 

The NNW fault, cross the MIU construction site, was identified from the previous study. In 2008, a borehole was drilled from gallery at GL-300m of the shaft. Several monitoring boreholes are located in the vicinity of the inferred NNW trending fault. The data from groundwater pressure monitoring at multiple depth intervals during the drilling activities show unique responses which seems to the deformation-induced effects. We report the possible application of using these hydraulic responses for characterizing the hydrogeological structures of the site.

Oral presentation

Hydrogeological investigations in Mizunami Underground Research Laboratory Project; Hydrogeological interpretation based on the long term pressure monitoring

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.

Oral presentation

Hydrogeological model interpretation in fractured rock based on the pressure derivative plot from single borehole hydrotesting data

Toya, Naruhisa; Takeuchi, Ryuji; Takeuchi, Shinji

no journal, , 

In fractured rock, it is important to understand the hydraulic connectivity because it might be main flow pass. Enachescu et al. (2004) presented a new derivative normalization method for displaying hydrotesting data. This method is very useful for the estimation of the hydraulic connectivity in fractured rock. We try to analysis the hydrotesting data of pilot borehole (06MI03) in MIU site with this method.

Oral presentation

Applicability of normalized pressure derivative plot for single hole hydraulic test in fracture rock

Toya, Naruhisa*; Takeuchi, Ryuji; Takeuchi, Shinji; Daimaru, Shuji; Nakano, Katsushi*; Kikuyama, Seiji*

no journal, , 

no abstracts in English

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