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Tsuda, Hidenori
Oyo Chishitsu, 55(5), p.216 - 228, 2014/12
Regarding grouting of geological disposal repository, geological research that shows the site specific existent condition and aggregation form of rock fractures reached ca.1000 m underground, which buried high-level radioactive waste, is necessary, by a limited number of rock boring survey in the earlier stage of the site investigation. And this fundamental problem holds the key to the success and failure of modeling, design and construction of grouting. This paper introduces rock fractures boring column by simulant real boring core, and attempted to overview of fractures perspective intervening and outer space of borings based on the cross-sectional representation of fractures. Using fractures column, each fracture's location, orientation, and those morphological combination forming fractures aggregate zone are shown systematically. In addition, the relationships between rock fractures and geological features, rock grading are shown in parallel.
Tsuda, Hidenori; Walker, C.; Shinkai, Fumiaki*; Kishi, Hirokazu*; Yui, Mikazu
Journal of Nuclear Science and Technology, 49(11), p.1110 - 1113, 2012/11
Times Cited Count：4 Percentile：30.67(Nuclear Science & Technology)Nakanishi, Tatsuro; Tsuda, Hidenori; Abumi, Kensho*; Uyama, Masao*; Onishi, Yuzo*
Proceedings of 7th Asian Rock Mechanics Symposium (ARMS-7) (USB Flash Drive), p.682 - 691, 2012/10
JAEA has been developing grouting materials and technologies with the consideration of long term chemical interaction between the grout material and the rock mass as a natural barrier. This paper describes the in-situ grout injection test program carried out in the fractured granite of the Grimsel Test Site (GTS) in Switzerland, which has been set up to increase knowledge and understanding of the design of grouting in order to reduce the grout penetration area into the rock mass and of the results of the site investigation. The grout injection test project at the GTS has been carried out in several stages. The site investigation results of all six boreholes were then used to determine the best location for the final grout injection test. The staged approach proved to be a good way not only to determine the best location for the grout injection test, but also to focus on the best approach in the next stages by identifying and mitigating possible problems before they occurred.
Nakanishi, Tatsuro; Fujita, Tomoo; Tsuda, Hidenori; Tanaka, Tatsuya*; Uyama, Masao*; Onishi, Yuzo*
Dai-41-Kai Gamban Rikigaku Ni Kansuru Shimpojiumu Koenshu (CD-ROM), p.71 - 76, 2012/01
Grouting technology is fundamental to the safe and efficient construction of underground facilities for the geological disposal of high level waste in Japan. The Japan Atomic Energy Agency has been developing grouting materials and technologies with consideration to the long term chemical interactions between the grout material and the natural barrier rock mass. An in-situ grout injection test has been carried out at the Grimsel Test Site to optimize grouting design.
Abumi, Kensho*; Tanaka, Tatsuya*; Hashimoto, Shuji*; Nakanishi, Tatsuro; Tsuda, Hidenori
Doboku Gakkai Heisei-23-Nendo Zenkoku Taikai Dai-66-Kai Nenji Gakujutsu Koenkai Koen Gaiyoshu (DVD-ROM), p.73 - 74, 2011/09
no abstracts in English
Nakanishi, Tatsuro; Kawaguchi, Masanao; Tsuda, Hidenori; Uyama, Masao*; Tanaka, Tatsuya*
Doboku Gakkai Heisei-23-Nendo Zenkoku Taikai Dai-66-Kai Nenji Gakujutsu Koenkai Koen Gaiyoshu (DVD-ROM), p.71 - 72, 2011/09
no abstracts in English
O
Matsuda, Masaaki; Chung, J.-H.*; Park, S.*; Sato, Taku*; Matsuno, Kenichiro*; Katori, Hiroko*; Takagi, Hidenori*; Kakurai, Kazuhisa; Kamazawa, Kazuya*; Tsunoda, Yorihiko*; et al.
Europhysics Letters, 82(3), p.37006_1 - 37006_5, 2008/05
Times Cited Count：22 Percentile：71.45(Physics, Multidisciplinary)Recently, two consecutive phase transitions were observed, upon cooling, in an antiferromagnetic spinel GeNiO at 
K and 
K, respectively. Using unpolarized and polarized elastic neutron scattering we show that the two transitions are due to the existence of frustrated minority spins in this compound. Upon cooling, at 
the spins on the 
111
kagom
planes order ferromagnetically in the plane and antiferromagnetically between the planes (phase I), leaving the spins on the 111 triangular planes that separate the kagom planes frustrated and disordered. At the lower 
, the triangular spins also order in the 111 plane (phase II). We also present a scenario involving exchange interactions that qualitatively explains the origin of the two purely magnetic phase transitions.
OMatsuda, Masaaki; Takeda, Masayasu; Nakamura, Mitsutaka; Kakurai, Kazuhisa; Osawa, Akira*; Leli
vre-Berna, E.*; Chung, J.-H.*; Ueda, Hiroaki*; Takagi, Hidenori*; Lee, S.-H.*
Physical Review B, 75(10), p.104415_1 - 104415_6, 2007/03
Times Cited Count：45 Percentile：81.89(Materials Science, Multidisciplinary)A frustrated spinel CdCrO undergoes a three-dimensional spin-Peierls transition at 
= 7.8 K from a cubic paramagnetic to a tetragonal Nel state. The Nel state has a spiral magnetic structure with a characteristic wave vector of 
when the 
axis elongated. Here we report our spherical neutron polarimetry experiments to investigate the spiral spin structure in detail. Our results indicate that the spins lie in the 
plane perpendicular to the direction of the spiral modulation. We also found that the spiral structure in the plane is elliptical with the -component larger by 
24% than the 
-component, suggesting a strong coupling between the magnetic structure and structural distortion. Unpolarized neutron diffraction under an external magnetic field has also been performed. The magnetic field dependence suggests existence of magnetic anisotropy in the Nel state, which is consistent with our previous inelastic studies.
OChung, J.-H.*; Matsuda, Masaaki; Lee, S.-H.*; Kakurai, Kazuhisa; Ueda, Hiroaki*; Sato, Taku*; Takagi, Hidenori*; Hong, K.-P.*; Park, S.*
Physical Review Letters, 95(24), p.247204_1 - 247204_4, 2005/12
Times Cited Count：149 Percentile：95.24(Physics, Multidisciplinary)no abstracts in English
Oyama, Hidenori*; Takakura, Kenichiro*; Nakabayashi, Masakazu*; Hirao, Toshio; Onoda, Shinobu; Kamiya, Tomihiro; Simoen, E.*; Claeys, C.*; Kuboyama, Satoshi*; Oka, Katsumi*; et al.
Nuclear Instruments and Methods in Physics Research B, 219-220, p.718 - 721, 2004/06
Times Cited Count：4 Percentile：30.46(Instruments & Instrumentation)no abstracts in English
Cr
)OMatsuda, Masaaki; Honda, Zentaro*; Katori, Hiroko*; Takagi, Hidenori*
no journal, ,
LiCrMnO has the spinel structure, in which the Cr
and Mn
moments with 
=3/2 are randomly located at the corners of the tetrahedron. It shows a spin-glass behavior below 
13 K suggested from the magnetic susceptibility experiments. Our neutron scattering study shows that short-range magnetic correlations with characteristic 
0.6 and 1.6 
develop at low temperatures. The correlation with 1.6 is explained by the antiferromagnetic fluctuations originating from the hexagonal spin clusters, which is proposed in ZnCrO.
Cr)OMatsuda, Masaaki; Honda, Zentaro*; Katori, Hiroko*; Takagi, Hidenori*
no journal, ,
LiCrMnO has the spinel structure, in which the Cr and Mn moments with =3/2 are randomly located at the corners of the tetrahedron. It shows a spin-glass behavior below 13 K suggested from the magnetic susceptibility experiments. Our neutron scattering study shows that short-range magnetic correlations with characteristic 0.6 and 1.6 develop at low temperatures. The correlation with 1.6 is explained by the antiferromagnetic fluctuations originating from the hexagonal spin clusters, which is proposed in ZnCrO.
Matsuda, Masaaki; Honda, Zentaro*; Katori, Hiroko*; Takagi, Hidenori*
no journal, ,
LiCrMnO has the spinel structure, in which the Cr and Mn moments with =3/2 are randomly located at the corners of the tetrahedron. It shows a spin-glass behavior below 13 K suggested from the magnetic susceptibility experiments. Our neutron scattering study shows that short-range magnetic correlations with characteristic 0.6 and 1.6 develop at low temperatures. The correlation with 1.6 is explained by the antiferromagnetic fluctuations originating from the hexagonal spin clusters, which is proposed in ZnCrO. We plan to perform neutron scattering experiments in magnetic field in the near future.
O in magnetic fieldMatsuda, Masaaki; Hoshi, Takemichi*; Katori, Hiroko*; Kosaka, Masashi*; Takagi, Hidenori*
no journal, ,
GeCoO has the spinel structure, in which the Co
moments with =3/2 are located at the corners of the tetrahedron. It shows an antiferromagnetic ordering with a characteristic wave vector of 
=(1/2, 1/2, 1/2) below 
21 K accompanied by a structural phase transition from cubic to tetragonal symmetry. This compound also exhibits a magnetic phase transition at 
4 T. Magnetic field dependence of some magnetic Bragg peak intensities was measured. For example, the (1/2, 1/2, 1/2) Bragg intensity increases with increasing magnetic field up to 4 T and gradually decreases above 4 T. This characteristic field is consistent with Hc. The field dependence of the intensity probably originates from the combined effects of the redistribution of the magnetic domains and a magnetic phase transition.
O studied by polarized neutron techniquesMatsuda, Masaaki; Osawa, Akira*; Takeda, Masayasu; Nakamura, Mitsutaka; Lelivre-Berna, E.*; Kakurai, Kazuhisa; Chung, J.-H.*; Lee, S.-H.*; Ueda, Hiroaki*; Takagi, Hidenori*
no journal, ,
no abstracts in English
O
Matsuda, Masaaki; Osawa, Akira*; Takeda, Masayasu; Nakamura, Mitsutaka; Kakurai, Kazuhisa; Lelivre-Berna, E.*; Chung, J.-H.*; Lee, S.-H.*; Ueda, Hiroaki*; Takagi, Hidenori*
no journal, ,
no abstracts in English
Hirao, Yoshihiro*; Matsuda, Norihiro; Sakamoto, Hiroki*; Kawano, Hidenori*; Onishi, Seiki*; Nobuhara, Fumiyoshi*
no journal, ,
no abstracts in English
O studied by polarized neutron techniquesMatsuda, Masaaki; Osawa, Akira*; Takeda, Masayasu; Kakurai, Kazuhisa; Chung, J.-H.*; Lee, S.-H.*; Ueda, Hiroaki*; Takagi, Hidenori*
no journal, ,
CdCrO has the spinel structure, in which geometrical frustration exists between the Cr moments located at the corners of the tetrahedron. It shows an incommensurate antiferromagnetic ordering below 
=7.8K with a characteristic wave vector of 
(
). We first performed a 1D polarized neutron analysis and determined that the Cr moments has a planer anisotropy in the plane, indicating that the magnetic structure is spiral. Finally, the 3D polarized neutron analysis using a CRYOPAD on TAS-1 at JRR-3 determined that the magnetic structure is elliptical spiral in the plane with ellipsoid slightly elongated along the axis. The origin of the structure will be discussed.
Matsuda, Masaaki; Honda, Zentaro*; Katori, Hiroko*; Takagi, Hidenori*; Ueda, Hiroaki*; Ueda, Yutaka*; Mitamura, Hiroyuki*; Kindo, Koichi*
no journal, ,
