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Mizuta, Yoshiaki*; Kaneko, Katsuhiko*; Matsuki, Koji*; Sugawara, Katsuhiko*; Sudo, Shigeaki*; Hirano, Toru; Tanno, Takeo; Matsui, Hiroya
JAEA-Research 2010-011, 35 Pages, 2010/06
JAEA-Research-2010-011.pdf:4.42MB
The best way to know the initial stress clearly is to measure it in the location where a tunnel will be excavated. However, it is difficult to measure a large number of the initial stresses, budgetary considerations notwithstanding, because of the large scale of underground structures like a radioactive waste disposal facility. Therefore we developed a method for determination of initial stress for arbitrary points from limited results of initial stress measurements. This report is a summary of the contract work about this development. At first, we made local scale numerical models of the Tono area. Using these models, we determined the regional stress state from limited initial stress measurements results. Then we applied the regional stress state to boundary conditions of other numerical models and estimated initial stress at arbitrary points. The result is an estimated initial stress that matched the original stress measurement results from the first analytical results.
Yamasaki, Chisato*; Murakami, Katsuhiko*; Fujii, Yasuyuki*; Sato, Yoshiharu*; Harada, Erimi*; Takeda, Junichi*; Taniya, Takayuki*; Sakate, Ryuichi*; Kikugawa, Shingo*; Shimada, Makoto*; et al.
Nucleic Acids Research, 36(Database), p.D793 - D799, 2008/01
Times Cited Count：51 Percentile：71.25(Biochemistry & Molecular Biology)Here we report the new features and improvements in our latest release of the H-Invitational Database, a comprehensive annotation resource for human genes and transcripts. H-InvDB, originally developed as an integrated database of the human transcriptome based on extensive annotation of large sets of fulllength cDNA (FLcDNA) clones, now provides annotation for 120 558 human mRNAs extracted from the International Nucleotide Sequence Databases (INSD), in addition to 54 978 human FLcDNAs, in the latest release H-InvDB. We mapped those human transcripts onto the human genome sequences (NCBI build 36.1) and determined 34 699 human gene clusters, which could define 34 057 protein-coding and 642 non-protein-coding loci; 858 transcribed loci overlapped with predicted pseudogenes.
Yonemura, Hirotaka*; Sato, Akira*; Sugawara, Katsuhiko*; Sawada, Atsushi
Heisei-19 Nendo (2007 Nen) Shigen, Sozai Gakkai Shunki Taikai Koenshu (I) Shigen Hen, p.121 - 122, 2007/03
no abstracts in English
Sato, Akira*; Fukahori, Daisuke*; Sugawara, Katsuhiko*; Sawada, Atsushi; Takebe, Atsuji*
Advances in X-ray Tomography for Geomaterials, p.315 - 321, 2006/09
The two dimensional (2D) diffusion tests with the rock sample which has single plane crack were conducted, and the diffusion of non-sorbing tracer from the crack to rock matrix is visualized by X-ray CT in this study. It was found that the increment of CT value due to the 2D diffusion of the dense tracer from crack surface to the matrix of rock sample was observed. It was also found that the application of image processing techniques makes it possible to obtain the clear image data and that the precious analysis of diffusion phenomena becomes possible. The numerical simulation was also conducted in order to verify the experimental results. The results of 2D diffusion tests show good agreement with the numerical results, and the applicability of X-ray CT to the analysis of diffusion phenomena in a rock sample was verified together with the necessary image processing techniques.
Mizuta, Yoshiaki*; Kaneko, Katsuhiko*; Matsuki, Koji*; Sugawara, Katsuhiko*; Sudo, Shigeaki*
JNC TJ7400 2004-011, 125 Pages, 2004/02
JNC-TJ7400-2004-011.pdf:11.26MB
In the fiscal year of 2003, our committee achieved the following work items during the contract period, from September 3rd, 2003 to February 13th, 2004. The more accurate numerical data with respect to the geological / geometrical conditions including the fault were provided from Tono Geoscience Center and the numerical models by Finite Element Method (FEM), Finite Difference Method (FDM) and Boundary Element Method (BEM) were built taking those strata data into account. For small region modeling by FEM, these layers models, Shoumasama model and Tohnou-Shoumasama model, as well as Thounou Mine model, were constructed, and each strain state at the far field boundary was determined. In order to get better agreement in local stress states with the measured values, a far field strain state was determined to the modified model in which material properties of upper granite and lower granite are different. In intermediate region modeling by FDM, actual strata data was taken into account, whereas strata boundary was assumed to be horizontal in former modeling, and far field stress field was analyzed. Intermediate region modeling by BEM was also carried out and field stress state was determined. In wide region modeling by FEM, the fault was built in the model and fault slip was taken into account, and evaluation of strain state at the far field boundary was carried out for inhomogeneous rock including fault. It was proposed to output three-dimensional distribution of the maximum shear stress coefficients in order to advance three-dimensional modeling. It will make clear effect of shape, scale and property of the fault on stress state characteristic. This report describes minutely the results of the studies mentional above.
Shimo, Michito*; Fumimura, Kenichi*; Obara, Yuzo*; Sato, Akira*; Sugawara, Katsuhiko*
JNC TJ8400 2003-091, 67 Pages, 2004/01
JNC-TJ8400-2003-091.pdf:2.72MB
In this year, the method proposed in H14 study was applied to a natural rock fracture in a 10 cm block, which has been prepared for permeability and tracer tests in the future.
Shimo, Michito*; Fumimura, Kenichi*; Obara, Yuzo*; Sato, Akira*; Sugawara, Katsuhiko*
JNC TJ8400 2003-021, 82 Pages, 2003/02
JNC-TJ8400-2003-021.pdf:3.05MB
Understanding the influence of small scale structure and its heterogeneity onto flow through rock fractures is important for improving the reliability of performance assessment of Geologic Disposal of High Level Nuclear Waste. An established technique for measuring the fracture aperture profile is required to achieve the above purpose. There are several aperture measuring techniques: (1) estimation of aperture from roughness measurement results, (2) direct measurement of the fracture from rock surface, (3) non-destructive method, such as tomography. Among above, tomography method, which is rather new technique and its applicability to aperture measurement is not well known, is expected to become an effective and feasible approach since the aperture profile can be obtained without destroying the rock specimen. In this work, we investigated problems associated with fracture aperture measurement using X-Ray, then we proposed several approaches to improve measurement accuracy, finally
Mizuta, Yoshiaki*; Kaneko, Katsuhiko*; Matsuki, Koji*; Sugawara, Katsuhiko*; Sudo, Shigeaki*
JNC TJ7400 2003-004, 70 Pages, 2003/02
JNC-TJ7400-2003-004.pdf:3.29MB
In the fiscal year of 2002, our committee achieved the following work items during the contract period, from August 28th, 2002 to February 7th, 2003. Confirm mutual understanding with respect to the geological / geometrical data provided from Tono Geoscience Center and exchange procedure for taking those into each numerical models. The numerical models by Finite Element Method and Finite Difference Method were built taking strata data into account. A problem accompanying to back analysis for inhomogeneous modeling was brought up. A new 3D Boundary Element Method Code in which integrations to calculate the influence coefficients are carried out analytically and thus, the solutions with high accuracy can be given faster. Three examples of determination procedures, wide region model by FEM, small region model by FEM and intermediate region model by FDM were introduced. This is the report as the results of the studies mentioned above.
Sato, Akira*; Fukahori, Daisuke*; Sugawara, Katsuhiko*; Sawada, Atsushi; Takebe, Atsuji
no journal, ,
no abstracts in English
Sato, Akira*; Fukahori, Daisuke*; Sugawara, Katsuhiko*
no journal, ,
no abstracts in English
Nakama, Shigeo; Sato, Toshinori; Kaneko, Katsuhiko*; Matsuki, Koji*; Sugawara, Katsuhiko*; Mizuta, Yoshiaki*
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no abstracts in English
