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JAEA Reports

Long-term pore-pressure-monitoring using deep boreholes in the Horonobe Underground Research Project

Yoshino, Hiromitsu; Kishi, Atsuyasu*; Yokota, Hideharu

JAEA-Data/Code 2015-014, 42 Pages, 2015/09

JAEA-Data-Code-2015-014.pdf:11.38MB
JAEA-Data-Code-2015-014-appendix(CD-ROM).zip:4.26MB

Long-term pore-pressure-monitoring has been performed using HDB-1$$sim$$11 and PB-V01 boreholes in the Horonobe Underground Research Laboratory Project. This report summarizes the results obtained from the starting of monitoring to March 2015.

Journal Articles

Monitoring of pore water pressure and water content around a horizontal drift through excavation; Measurement at the 140m gallery in the Horonobe URL

Yabuuchi, Satoshi; Kunimaru, Takanori; Kishi, Atsuyasu*; Komatsu, Mitsuru*

Doboku Gakkai Rombunshu, C (Chiken Kogaku) (Internet), 67(4), p.464 - 473, 2011/11

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. Pore water pressure and water content around a horizontal drift in the URL have been monitored for over 18 months since before the drift excavation was started. During the drift excavation, both pore water pressure and water content were decreasing. Pore water pressure has been still positive though it continued to decrease with its gradient gradually smaller after excavation, while water content turned to increase about 6 months after the completion of the excavation. It turned to fall again about 5 months later. An unsaturated zone may have been in homogeneously formed around the horizontal drift considering a degassing.

Oral presentation

Water content monitoring during the excavation of the horizontal drift in the Horonobe Underground Research Laboratory Project

Yabuuchi, Satoshi; Kishi, Atsuyasu*; Komatsu, Mitsuru*

no journal, , 

no abstracts in English

Oral presentation

Estimating of in-situ hydraulic conductivity related with evaluating of rainfall infiltration behavior in shallow ground

Komatsu, Mitsuru*; Nishigaki, Makoto*; Seno, Shoji*; Tagishi, Hirotaka*; Takenobu, Kazuyoshi*; Kishi, Atsuyasu

no journal, , 

Infiltration rate at the ground surface is one of the essential boundary conditions for a quantitative evaluation of groundwater flow. Conventional method for quantifying infiltration rate based on the water budget, however, includes significant uncertainties resulting from different types of quantities to be measured. In this study, focusing on a method where the infiltration rate is estimated directly from temporal changes in soil water contents in the region of interest, the measurement data was confirmed based on the ${it in-situ}$ unsaturated hydraulic tests. Then, the reliability of the measurement was verified by comparing the ${it in-situ}$ data to the laboratory test results and uncertainties associated with the ${it in-situ}$ measurements were quantified.

Oral presentation

Confirmation of the performance test of the optical fiber moisture metering sensor

Seno, Shoji*; Komatsu, Mitsuru*; Nishigaki, Makoto*; Tagishi, Hirotaka*; Takenobu, Kazuyoshi*; Kishi, Atsuyasu

no journal, , 

The soil moisture measurement method is being developed with the application of the optical fiber sensor, that is thought to be more advantageous than the conventional methods in the soil moisture measurement regarding its characteristics of multiple-point and long-distance measurement. We report the results obtained in the performance test of the optical fiber moisture metering sensor in the course where its fundamental mechanism and its principle are being developed.

Oral presentation

In-situ moisture monitoring methods for the sedimentary rocks as affected by groundwater salinity

Komatsu, Mitsuru*; Kishi, Atsuyasu; Tsukuda, Akie*

no journal, , 

In this study, with the goal of applicability an in-situ measurement technique for monitoring generation and extension of the unsaturated zone around a drift, a set of water content measurement was carried out for the core samples collected during the excavation of pilot survey drift in a sedimentary rock formation. For the drill core collected under brine environment the Horonobe deep underground laboratory, FDR-V method was applied. FDR-V measures complex permittivity from reflection characteristic in the coaxial cable tip using an electromagnetic wave with high frequency. The results showed that the effects of the salinity on the measurement were insignificant.

Oral presentation

Transition of groundwater conditions obtained in a borehole investigation

Hokari, Toshiyuki*; Okihara, Mitsunobu*; Kishi, Atsuyasu; Mizuno, Takashi; Miyakawa, Kazuya

no journal, , 

Safety assessment for radioactive waste disposal or CO$$_{2}$$ sequestration requires in-situ groundwater conditions, which have been investigated in use of boreholes. Since those disposal facilities are to be set deep under the ground, boreholes would be completed with steel casings and cementing for wall protection. It is known that the well completion affects the groundwater conditions. This report conducted a new investigation on the groundwater conditions in JAEA Horonobe, and discusses transition of the water conditions, which would be induced by the well completion, in addition to existing water condition data.

Oral presentation

In-situ moisture monitoring methods for the sedimentary rocks as affected by temperature

Tsukuda, Akie*; Komatsu, Mitsuru*; Kishi, Atsuyasu

no journal, , 

In this study, with the goal of applicability an in-situ measurement technique for monitoring generation of the unsaturated zone around a drift and performance of the artificial barrier, a set of water content measurement was carried out for the core samples collected during the excavation of pilot survey drift in a sedimentary rock formation. For the drill core collected Koetoi layer, FDR-V method was applied. FDR-V measures complex permittivity from reflection characteristic in the coaxial cable tip using an electromagnetic wave with high frequency. The results showed that the effects of the temperature on the measurement were insignificant.

Oral presentation

Transition of groundwater conditions obtained in a borehole investigation, 2

Hokari, Toshiyuki*; Okihara, Mitsunobu*; Kishi, Atsuyasu*; Mizuno, Takashi; Miyakawa, Kazuya

no journal, , 

no abstracts in English

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