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Shingu, Kazuki*; Nakajima, Toshihide*; Yamashita, Mitsugu*
JNC TJ7420 2005-066, 99 Pages, 2000/03
JNC-TJ7420-2005-066.PDF:2.47MB
The active fault survey tunnel across the Mozumi-Sukenobu Fault is located at the Kamioka Mine, northern Gifu prefecture, Central Japan. At present, the comprehensive studies of the active fault are being carried out in this tunnel. In this report, the results of the laboratory test using steel pipes and numerical simulation for the new ground stress measuring instrument were presented in order to inspect the stress state around the active fault.
Shingu, Kazuki*; Nakajima, Toshihide*; Yamashita, Mitsugu*
JNC TJ7420 2005-063, 242 Pages, 1999/03
JNC-TJ7420-2005-063.PDF:19.78MB
The active fault survey tunnel across the Mozumi-Sukenobu Fault is located at the Kamioka Mine, northern Gifu prefecture, Central Japan. At present, The comprehensive studies of the active fault are being carried out in this tunnel. The results of the laboratory test and numerical simulation for the new ground stress measuring instrument were presented in order to inspect the stress state around the active fault.
Takemura, Tomoyuki*; Sakogaichi, Kaoru*; Takahashi, Eiichiro*; Takebe, Akimitsu*; Nakajima, Toshihide*; Yamashita, Mitsugu*; Yamanouchi, Hirofumi*
JNC TJ7420 2005-041, 129 Pages, 1999/03
JNC-TJ7420-2005-041.pdf:65.88MB
The active fault survey tunnel that crossed the Mozumi-Sukenobu fault (a member of the Atotsugawa fault system) is located at the Kamioka mine, northern Gifu prefecture, Central Japan. The comprehensive study of the active fault such as the earthquake mechanism is done by using this tunnel. The purpose of this investigation is to define the hydrological characteristics inside and around the Mozumi - Sukenobu fault crush zones. The investigation is mainly Lugeon test and simple permeability test inside and around the crush zones.
Shingu, Kazuki*; Nakajima, Toshihide*; Yamashita, Mitsugu*
JNC TJ7420 2005-038, 39 Pages, 1998/03
JNC-TJ7420-2005-038.pdf:3.05MB
The active fault study drift that crossed the Mozumi-Sukenobu fault (a member of the Atotsugawa fault system) is located at the Kamioka mine, northern Gifu prefecture, Central Japan. The comprehensive study of the active fault is done in this drift. The purpose of this investigation is to obtain the data of the basis to clear the hydro-geological structure around the active fault. From December 1, 1997 to March 13, 1998, the pore pressure was measured using the hole.
Takemura, Tomoyuki*; Shingu, Kazuki*; Sakogaichi, Kaoru*; Nishikawa, Yuji*; Okada, Yoichi*; Nakajima, Toshihide*; Yamashita, Mitsugu*
JNC TJ7420 2005-035, 152 Pages, 1998/03
JNC-TJ7420-2005-035.pdf:27.16MB
The active fault survey tunnel that crossed the Mozumi-Sukenobu fault (MSF) is located at the Kamioka mine, northern Gifu prefecture, Central Japan. The comprehensive study of the active fault, such as the study of the earthquake mechanism and the development of the new initial stress measurement method is done by using this tunnel. One of the purposes of this investigation is to define the three-dimensional distribution of the MSF by geological survey, on the basis of the seismic and geophysical studies on this fault. The other purpose is to develop the new initial stress measurement method.
*; Shingu, Kazuki*; Takahashi, Eiichiro*; Nakajima, Toshihide*; Yamashita, Mitsugu*; *; *
PNC TJ7187 97-002, 586 Pages, 1997/11
None
; *; Tsukimori, Kazuyuki; ;
PNC TN9410 92-100, 91 Pages, 1992/03
Since vessel and piping components of FBR plants are generally thin wall structures, prevention of buckling against seismic loadings is important. This paper is the first report on buckling tests of circular cylindrical shells by shear forces with the purpose of rationalizing the design method for FBR components. In this report, we tries to classify the type of buckling behaviors for different shapes by using shell parameters and explain the effects of initial shape imperfection and edge constraint conditions on the bending behavior. Test specimens are thin wall circular cylindrical shells made of SUS304 with the inner diameter of 500mm. In these tests, shear displacements were applied statically at the free end of the specimens. The characteristics or bending or shear buckling behavior were analyzed from the measured data of the force, displacements, strains and deformed shapes. The following results were obtained. (1)Bending buckling deformation is characterized by bulging near the fixed end, while shear buckling deformation is characterized by oblique wrinkle of both sides between both ends of the shell. (2)Buckling mode changes from shear to bending type with the increase of the ratio of length to radius(L/R). The transition boundary of these modes is the line of L/R 
2.0. (3)The effect of plasticity on buckling behaviors becomes small, as the ratio of radius to thickness(R/t) increases. (4)The buckling load(Q 
) of the shell with 2-wave artificial axial imperfection was 7% smaller and Q of the shell with 6-wave artificial circumferential imperfection was 8% smaller than that of the shell without imperfection. (5)The buckling load of the shell with TIG welded end was 5% smaller than that with squeezing type constraint end. (6)The value of Q decreases with the increase of R/t and L/R. This tendency can be explained by the effect or plasticity, that is, the plastic buckling load(Q , 
). In order to develop a ...
Garatani, Kazuteru; Yamashita, Takuya; Tsukimori, Kazuyuki; Nakamura, Mitsugu*; Iwata, Koji
PNC TN9410 91-350, 62 Pages, 1991/11
The thermal stress ratchetting is one of the important failure modes to be prevented in the design of FBR components. To avoid this kind of deformation, the Bree diagram expressed by the combination of primary and secondary stresses has been used in the design of FBR. However, even without primary stress, there is a possibility of ratchetting due to temperature dependence of yield stress when large variations of temperature exist locally. The purpose of this study is to confirm those phenomena by experiment and FEM analysis, and to prove this mechanism by a theoretical model. The following results were obtained. (1) The occurrence of compressive ratchetting deformation was demonstrated by a three bar thermal ratchetting test where the temperature of the central bar was varied cyclically from 20
C to 500C. (2) The analysis of the three bar ratchetting test was performed by using the nonlinear cyclic hardening model (Ohno model) installed in FINAS. It is confirmed that the result of analysis represents the experimental ratchetting behavior well. (3) The ratchetting strain per one cycle : 
of a three bar thermal ratchetting model was derived by using the elastic-perfect plastic model in consideration of temperature dependence of yield stress. [=-
: the first cycle a)] [=-
: following cycle b)] 
: thermal expansion ratio, 
T : variation of temperature, E : Young's modulas, 
, 
; :yield stress at higher and lower temperature respectively. The ratchetting occurs when the first term of right side is greater than the second term of b) equation. (4) The analytical solution by (3) represents well the initial ratchetting behavior of the test. This type of ratchetting occurs due to the temperature dependence of the yield stress of the material.