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Kagami, Saya; Yokoyama, Tatsunori
no journal, ,
no abstracts in English
Iwatsuki, Teruki
no journal, ,
The results of Surface-based investigation phase and Construction phases in MIU project were summarized. The investigation techniques of geology, geological structure, rock strength, groundwater inflow and chemistry for facility design and construction were prepared in Surface-based investigation phase. In the Construction phase, the techniques used in Surface-based investigation phase were evaluated based on the data gained in the underground gallery.
Onoe, Hironori; Murakami, Hiroaki; Ozaki, Yusuke; Watanabe, Yusuke; Takeuchi, Ryuji; Iwatsuki, Teruki
no journal, ,
no abstracts in English
Mikake, Shinichiro
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no abstracts in English
Goto, Akira; Shimada, Koji
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In the South Kyushu, where the existence of shear zones with high strain rate and unclear active fault topography was pointed out, surface reconnaissance was conducted and the reverse stress analysis of small faults was carried out in order to grasp the dynamic influence range. As a result, the displacement sense of the fault was able to grasp the harmonious range with the east-west stress field defining the shear zone. Therefore, the possibility that the stress reverse analysis can estimate the mechanical influence range of the surface of the shear zone was obtained.
Ozaki, Yusuke; Onoe, Hironori; Iwatsuki, Teruki
no journal, ,
We perform Groundwater REcovery Experiment in Tunnel (GREET) in Mizunami underground research laboratory, where we close a part of the test drift by in-site ground water. During the experiment, the disturbance of hydraulic pressure and water quality is observed according to the excavation and closure of the drift. The distribution of the disturbance is highly heterogeneous due to the fracture in granite. To simulate such heterogeneous distribution of hydraulic pressure and water quality, we applied the equivalent continuous porous medium based on discrete fracture networking model. In addition, to predict the long term disturbance of water quality due to the dissolution of shotcrete, we also perform the reactive transport simulation. From these simulations, the convection current has great impact on the disturbance of water quality around the drift.
Hiratsuka, Shinya; Saiga, Atsushi; Asamori, Koichi
no journal, ,
Hydrothermal activity is generated in the Kii Peninsula although it is a non-volcanic region. High helium isotope ratio, low seismic velocity and low resistivity suggest that hydrothermal water is originated from deep fluid. This study attempt to estimate the migration process of deep fluid using seismological method so-called S-wave splitting analysis. The result shows that high anisotropic region may correspond to migration process of deep fluid, but it is necessary for more accumulation of seismological data.
Watanabe, Yusuke; Kashiwaya, Koki*
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no abstracts in English
Takeuchi, Ryuji
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no abstracts in English
Niwa, Masakazu; Kawamura, Makoto; Ishimaru, Tsuneari
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The Tono Geoscience Center will provide scientific knowledge and investigation and evaluation technology necessary for geological disposal projects and national safety regulations. We are conducting integrated R&D on research technology development and systematization, impact assessment model development and geo-chronological technology development.
Murakami, Hiroaki
no journal, ,
no abstracts in English
Nakanishi, Toshimichi; Komatsu, Tetsuya; Ogata, Manabu
no journal, ,
no abstracts in English