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Matsui, Hiroya; Tanaka, Tatsuya*; Fujii, Haruhiko*; Takeuchi, Shinji; Iyatomi, Yosuke; Sugihara, Kozo
Dai-38-Kai Gamban Rikigaku Ni Kansuru Shimpojiumu Koen Rombunshu (CD-ROM), p.131 - 136, 2009/01
Grouting is practically important to reduce groundwater inflow into a cavern for construction of underground facilities. Studies on the grouting performance were carried out in Mizunami URL excavated in crystalline rock. The aims of these studies are to evaluate the applicability of existing grouting technology and to develop the methodology for the estimation of grouting performance, e.g., the extension of grout, hydraulic property change. The results suggests that the existing grouting technology is effective to reduce groundwater inflow into drifts and the hydraulic conductivity in the surrounding rock may decrease by two orders of magnitude before grouting.
Tanaka, Tatsuya*; Matsui, Hiroya; Hashimoto, Shuji*; Ando, Kenichi*; Takeuchi, Shinji; Saegusa, Hiromitsu
Dai-38-Kai Gamban Rikigaku Ni Kansuru Shimpojiumu Koen Rombunshu (CD-ROM), p.143 - 148, 2009/01
This study aims to establish techniques for grouting, and evaluation of the effects of grouting on the geological environment, to be applied in the field of high level radioactive waste disposal in the deep underground. A block-scale hydrogeological model has been generated using discrete fracture networks based on data obtained from the short-borehole investigation campaign performed at the research tunnel around which grouting has been carried out. The grouting performance in terms of reducing the water inflow rate was evaluated by groundwater flow simulation. Lessons learned applicable to future studies of in-situ testing have been addressed.
Ando, Kenichi*; Takeuchi, Shinji; Matsui, Hiroya; Tanaka, Tatsuya*; Hashimoto, Shuji*; Fujii, Haruhiko*
Dai-38-Kai Gamban Rikigaku Ni Kansuru Shimpojiumu Koen Rombunshu (CD-ROM), p.137 - 142, 2009/01
Evaluation of the effect of grouting on the geological environment is important for quality control of the design and management of the construction of underground facilities for high level radioactive waste disposal. Lugeon test has been commonly used to check the hydraulic characteristics around borehole whether or not to inject grout in Japan. The aim of this study is to develop a hydraulic test which can be applied to obtain hydraulic conductivities of low permeable rockmass (e.g. 10
to 10
m/s) during grouting. The proposed hydraulic test with the test sequence of water injection and pressure recovery has been carried out in Mizunami URL excavated in crystalline rock. The developed type curve matching methodologies have been applied to evaluate hydraulic conductivity in-situ in a simple manner. Lessons learned for future application for grouting have been addressed.
Yamazaki, Masanao; Tsusaka, Kimikazu; Hatsuyama, Yoshihiro*; Minamide, Masashi*; Takahashi, Akihiro*
Dai-38-Kai Gamban Rikigaku Ni Kansuru Shimpojiumu Koen Rombunshu (CD-ROM), p.196 - 201, 2009/01
The Underground Research Laboratory in Hokkaido has been constructed by JAEA. In shaft excavation, convergence, lining stress, etc. are measured and analyzed in order to evaluate the validity of a support design. In this report, correlation between initial deformation ratio of convergence and lining stress in shaft excavation is discussed. Prediction equation of the lining stress from the initial deformation ratio of convergence in the short step method is also proposed.
Kumamoto, So*; Shimo, Michito*; Saegusa, Hiromitsu; Oyama, Takuya
Dai-38-Kai Gamban Rikigaku Ni Kansuru Shimpojiumu Koen Rombunshu (CD-ROM), p.281 - 286, 2009/01
The Mizunami Underground Research Laboratory is being constructed by Japan Atomic Energy Agency in the Cretaceous Toki Granite in the Tono area, Central Japan. During construction, the information needed for testing and revising the hydrogeological model has been obtained. During shaft excavation, pumping of groundwater from the shaft has to be halted and the water level in shaft was recovered for the improvement of facility for treatment of discharged groundwater. This period was divided into three major phases, such as excavation, recovery and discharging phases, and hydraulic behavior in the phases was considered as a large-scale pumping test. In this study, model testing and calibration using the data of inflow volume and hydraulic behavior observed in these three phases have been carried out.
Sawada, Atsushi; Tetsu, Keiichi*
Dai-38-Kai Gamban Rikigaku Ni Kansuru Shimpojiumu Koen Rombunshu (CD-ROM), p.266 - 271, 2009/01
no abstracts in English