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Sugihara, Kozo; Matsui, Hiroya
Heisei-22 Nendo (2010 Nen) Shigen, Sozai Gakkai Shuki Taikai Koenshu, p.157 - 160, 2010/09
no abstracts in English
Sawada, Atsushi; Tetsu, Keiichi*
no journal, ,
no abstracts in English
Masunaga, Kosuke; Amano, Kenji; Tsuruta, Tadahiko
no journal, ,
A case study of deep borehole collapse has been analyzed in the Tono area Gifu prefecture in order to estimate frequency and degree of the collapse during the borehole drilling that could become the risk factor of the characterization on the geological environment. As a result, the collapse occurred at the fractures and its adjacent part which has specific preferred orientations with major fractured zone.
Tsuruta, Tadahiko; Ochi, Minoru; Yuguchi, Takashi; Tagami, Masahiko; Kakamu, Kazuhiko; Yoshida, Hidekazu*; Nishimoto, Shoji*; Nishiyama, Tadao*; Nakamata, Kiminori*
no journal, ,
no abstracts in English
Kurihara, Arata; Matsuoka, Toshiyuki; Tsuruta, Tadahiko; Martin, A.*
no journal, ,
In this presentation, we will report the development progress of an analytic tool to evaluate uncertainty of deterministic fault distribution for geological model, belong to the site descriptive model constructed into ISIS under support from Information Synthesis Interpretation System (ISIS; based on research and development commissioned by Agency for Natural Resources and Energy). It is important for understanding distribution of geological features to evaluate and decrease uncertainty into the geological model. Therefore, on the aim of building an expert system with systematic procedures and know-how for geological modeling and model assessment, we developed this tool can calculate an existence probability of faults and geological information contributed to modeling for numerical parameters.
Sugita, Yutaka; Sanada, Hiroyuki; Nakamura, Takahiro; Yabuuchi, Satoshi
no journal, ,
no abstracts in English
Hayashi, Katsuhiko; Kishi, Hirokazu; Takebe, Atsuji*
no journal, ,
The geological disposal facility for high-level radioactive waste has the new structure that consists of many tunnels in parallel (multi tunnels) at 300 m under the ground. Our organization designed this facility by using single tunnel model at the beginning, however we realized that this method can not predict where is excavation disturbed zone that is caused by excavation as multi tunnels characteristics. Now we are investigating the new design methodology with multi tunnel models that takes into account of their behavior for improving design accuracy.
Sanada, Hiroyuki; Nakamura, Takahiro; Sugita, Yutaka
no journal, ,
no abstracts in English
Oikawa, Yasuki*; Soma, Nobukazu*; Tosha, Toshiyuki*; Matsui, Hiroya; Tanno, Takeo; Hirano, Toru*
no journal, ,
Acoustic Emission / Deformation Rate Analysis method (AE/DRA method) is a stress measurement method that uses test pieces cut from a drilled rock core. These test pieces are examined in a laboratory with cyclic-loading tests to measure stress along an axial direction in the original rock mass. We have conducted a basic research on a simple and low-cost estimation method to characterize the rock within the excavated damage zone using data from the investigation with a borehole (including drilling) most effectively. Here, we conducted AE/DRA stress measurement using rock cores provided from the Mizunami underground research laboratory's gallery at -200 m depth. Measured each stress data were varied even if in a same direction but estimated 3-D directions of 
1 located in EW
(NW-SE)NS range. This generally matches to the hydrofrac stress measurement data conducted near the Mizunami laboratory. A lot of stress data obtained from AE/DRA method and a flexible stress inversion method cause to estimate stable 3-D stress fields.
Noguchi, Akira; Nakayama, Masashi; Sato, Haruo
no journal, ,
We are developing to apply the Highly fly-ash contained silica-fume cement (HFSC) for the support of the high-level radioactive waste repositories with shot-crete construction technology. We showed that HFSC424, a fifth of binder is changed to silica-fume and two fifth is changed to fry-ash, has as much workability as ordinary portrand cement shotcrete. And reducing water binder ratio to 30%, we can get a mix proportion whose compressive strengh is more than 36 MPa. From June, 2009, we performed spraying test in the 140 m gallery off the west shaft of the Horonobe URL. The support made from this proportion has enough strength and this proportion of the HFSC concrete has good workability. Moreover, the dust on spraing and rebound ratio on spraying is less than ordinary shotcrete. On spraying HFSC shotcrete, the rebound ratio is very low, and less dust than ordinary one. We will construct with HFSC more, and research on the influence to the environment around the support made by the HFSC.
Sekiya, Yoshitomo; Kitagawa, Yoshito*; Igarashi, Toshifumi*; Hokora, Hideyuki*
no journal, ,
no abstracts in English