Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
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.
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.
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.
Kunitomi, Kazuhiko; Nakagawa, Shigeaki; Fujimoto, Nozomu; Shindo, Masami; Sudo, Yukio
The Safety,Status and Future of Non-Commercial Reactors and Irradiation Facilities,Vol. 1, p.281 - 286, 1990/10
no abstracts in English
Shiina, Yasuaki; Kunitomi, Kazuhiko; Maruyama, So; ; Nakagawa, Shigeaki; Hirano, Masashi; Iyoku, Tatsuo; Shindo, Masami; Sudo, Yukio
JAERI-M 90-034, 104 Pages, 1990/03
no abstracts in English
Fujimoto, Nozomu; Nakagawa, Shigeaki; Tsuyuzaki, Noriyoshi; *; *; Sudo, Yukio
JAERI-M 89-195, 97 Pages, 1989/11
no abstracts in English