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Masumoto, Kazuhiko*; Takeuchi, Ryuji
Oyo Chishitsu, 57(4), p.154 - 161, 2016/10
Fractures developing around the tunnel during the excavation result in issues related not only to the mechanical stability of the rock cavern, but also to the groundwater flow paths. In order to estimate the possibility of application of the GPR (Ground Penetration Radar) to estimate the fractures as low paths, the authors conducted the GPR survey along the side wall of 500 m access tunnel of the Mizunami Underground Research Laboratory of JAEA. The results of the profile measurements indicated that water-conductiong fractures were detected as a reflected waves using GPR survay. Furthermore, as the results of fixed-point measurements during the injection of the saline water, it could be indicated to estimate the flow paths of saline water in the fractures, in a non-destructive way, based on spectral analysis in the reflected waveforms of GPR.
Yamada, Nobuto; Suzuki, Keiichi*; Kanazawa, Sunao*; Tsuge, Takashi*
no journal, ,
To evaluate the distribution of geological discontinuity such as fractures around the underground gallery is one of the important factors to conduct high level radioactive waste disposal, but it is difficult to evaluate them enough only by geological survey such as boring investigations. We carried out GPR to obtain the distribution of fractures exist nearby the underground gallery of granite in Mizunami Underground Research Laboratory, and understand that we can detect them by GPR.
Kurihara, Keisuke*; Masumoto, Kazuhiko*; Takeuchi, Ryuji
no journal, ,
no abstracts in English
Masumoto, Kazuhiko*; Takeuchi, Ryuji; Onoe, Hironori
no journal, ,
no abstracts in English
Masumoto, Kazuhiko*; Matsushita, Tomoaki*; Takeuchi, Ryuji
no journal, ,
no abstracts in English
Masumoto, Kazuhiko*
no journal, ,
no abstracts in English
Masumoto, Kazuhiko*; Matsushita, Tomoaki*; Takeuchi, Ryuji
no journal, ,
The monitoring of groundwater condition in fractures around the rock cavern is important for safety assessment for high level radioactive waste. The GPR (Ground Penetrating Radar) method is unique technique to survey the water condition in fractures, indirectly, and with no disturbance of original groundwater condition. The authors conducted the GPR monitoring of infiltration of saline water on the side wall of the 500m access tunnel of Mizunami Underground Research Laboratory. The results showed that the difference of saline concentration in fractures caused the change of the reflection wave form and the intense of spectrum due to the results of spectrum analysis of reflection wave.
