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Ijiri, Yuta*; Ono, Naoko*; Ukai, Shigeharu*; Yu, H.*; Otsuka, Satoshi; Abe, Yosuke; Matsukawa, Yoshitaka*
Philosophical Magazine, 97(13), p.1047 - 1056, 2017/02
Times Cited Count：2 Percentile：11.52(Materials Science, Multidisciplinary)The interaction between oxide particles and dislocations in a 9Cr-ODS ferritic steel is investigated by both static and in-situ TEM observation under dynamic straining conditions and room temperature. The measured obstacle strength (
) of the oxide particles was no greater than 0.80 and the average was 0.63. The dislocation loops around some coarsened particles were also observed. The calculated obstacle strength by a stress formula of the Orowan interaction is nearly equaled to the average experimental value. Not only cross-slip system but also the Orowan interaction should be considered as the main interaction mechanism between oxide particles and dislocation in 9Cr-ODS ferritic steel.
Ijiri, Yuji*; Ono, Makoto*; Sugihara, Yutaka*; Shimo, Michito*; Yamamoto, Hajime*; Fumimura, Kenichi*
JNC TJ7400 2004-015, 732 Pages, 2003/10
JNC-TJ7400-2004-015.pdf:34.55MB
In order to establish the most effective procedures for groundwater flow characterization in order to reduce the uncertainty this study, the identidication of essential uncertainty factors for the groundwater flow characterization has been attempted using various conceptual model. In this study, an integrated data flow on the groundwater flow simuration was developed for previously applied various conceptural models. The data flow consists of five steps in order: (1) field investigation, (2) raw / conditioned data, (3) interpretation / data set, (4) conceptualization / modeling / simulation, and (5) results / applications. These are uncertainties in each work and assumption in every step, and the uncertainties have an influence on the modeling methods and simulation resuls. Following the data flow, the uncertain factors affecting the groundwater flow simulation were extracted based on the simulation resuls. Investigation data, methods of investigation and modeling, and analysis technique were examined to solve the problems due to the uncertainties. Acquired information is summarized in the following. As for each work process in the data flow, the uncertainty factors that are considered to affect the results of simulations are extracted by two kinds of comparison methods as follows: (1) comparison of data flow among analysis cases for each conceptual model, and (2) comparison of data flow among conceptual models for each case. The uncertainty factors include hydrogeological mechanism of fault and effective porosity, and the likes. The development of each data flow for four modeling methods was additionally used to clarify the data interpretation technique, the modeling procedure, and the uncertainty factor in each data flow along with the data flow from investigation through evaluation. Extensive through information without bias is, therefore, reflected in groundwater flow analysis by defining the data flow. Establishment of data flow...
Ijiri, Yuji*; Ono, Makoto*; Sugihara, Yutaka*; Shimo, Michito*; Yamamoto, Hajime*; Fumimura, Kenichi*
JNC TJ7400 2004-005, 415 Pages, 2003/03
JNC-TJ7400-2004-005.pdf:23.86MB
For the purpose of evaluating how uncertainties included in modeling of hydrogeological structure and results of groundwater simulation decreased with progress of investigation research, updating and calibration of the models about several modeling techniques of hydrogeological structure and groundwater flow analysis techniques were carried out, based on the information and knowledge which were newly acquired. The acquired knowledge is as follows.The model calibration is performed by the method of matching numericals simulation with observation, about the pressure response caused by opening and closing of a packer in MIU-2 borehole. Each analysis technique attains reducing of residual sum of squares of observations and results of numerical simulation by adjusting hydrogeological parameters. However, each model adjusts different parameters as water conductivity, effective porosity, specific storage, and anisotropy. When calibrating models, sometimes it is impossible to explain the phenomena only by adjusting parameters. In such case, another investigation may be required to clarify details of hydrogeological structure more.Since it is a little more flexible about boundary condition and faults except Tsukiyoshi fault than last year, travel paths themselves vary a little rather than last year. However, as a result, when travel paths are almost the same, model calibration can reduce the variation of travel length and Darcy velocity among models within about one order. It will be necessary to propose investigation aiming at reducing the uncertainty of data, such as water conductivity and effective porosity and at making hydrogeological structure more detailed from a viewpoint of modeling.
Ijiri, Yuji*; Ono, Makoto*; Sugihara, Yutaka*; Shimo, Michito*; Yamamoto, Hajime*; Fumimura, Kenichi*
JNC TJ7400 2004-003, 610 Pages, 2003/03
JNC-TJ7400-2004-003.pdf:42.03MB
This study involves evaluation of uncertainty in hydrogeological modeling and groundwater flow analysis. Three-dimensional groundwater flow analisys in underground research laboratory site in Tono was carried out using three continuum models and one discontinuum model in the domain of 9km
9km area. The acquired knowledge is as follows.The effect of variety of modeling method was evaluated under the condition that same analysis domain and same shape of Tsukiyoshi fault were assingned. The results indicated that the variation of travel pathway and travel length resulted from heterogeneity is sometimes larger than from the difference of models, depending on a place. Besides, since the difference between the models in travel time was larger than a travel pathway and travel length, it turns out that the uncertainty of effective porosity used for alculation of the actual flow velocity is large.Moreover, the existing data flow was reconstituted through a series of modeling and analysis of this work. The results indicated that it is necessary to continue reflecting the results of investigation and evaluation in data flow, since data flow varied with modeling concepts.
Hata, Akihito*; Ijiri, Yuji*; Oishi, Masaya*; Sugihara, Yutaka*
JNC TJ8440 2003-001, 99 Pages, 2003/01
JNC-TJ8440-2003-001.pdf:2.49MB
None
Ijiri, Yuji*; Suzuki, Shunichi*; Sugihara, Yutaka*; Shimo, Michito*; Yamamoto, Hajime*; *
JNC TJ7400 2002-003, 525 Pages, 2002/03
JNC-TJ7400-2002-003.pdf:15.78MB
no abstracts in English
*; Ijiri, Yuji*; Suzuki, Shunichi*; Oishi, Masaya*; Sugihara, Yutaka*
JNC TJ8440 2002-002, 207 Pages, 2002/01
JNC-TJ8440-2002-002.pdf:4.38MB
None
Ijiri, Yuji*; Hattori, Hiromichi*; Suzuki, Shunichi*; Oishi, Masaya*; Kubota, Shigeru*; Adachi, Tetsuya*; Yamamoto, Takuya*; Igarashi, Takafumi*; Sugihara, Yutaka*
JNC TJ8400 2001-009, 41 Pages, 2001/03
JNC-TJ8400-2001-009.pdf:6.69MB
no abstracts in English
*; *; Adachi, Tetsuya*; Ijiri, Yuji*; Sugihara, Yutaka*
JNC TJ7400 2001-008, 293 Pages, 2001/03
JNC-TJ7400-2001-008.pdf:10.15MB
no abstracts in English
Ijiri, Yuji*; Suzuki, Shunichi*; Oishi, Masaya*; Sugihara, Yutaka*; Shimo, Michito*; *; *
JNC TJ7400 2001-007, 612 Pages, 2001/03
JNC-TJ7400-2001-007.pdf:118.17MB
no abstracts in English
Ijiri, Yuji*; Adachi, Tetsuya*; Suzuki, Shunichi*; Oishi, Masaya*; Sugihara, Yutaka*
JNC TJ8440 2001-002, 93 Pages, 2001/02
JNC-TJ8440-2001-002.pdf:4.19MB
no abstracts in English
Shimo, Michito*; Ijiri, Yuji*; Aoki, Tomoyuki*; Sugihara, Yutaka*
PNC TJ7205 95-001, 189 Pages, 1995/03
None
Shimo, Michito*; Aoki, Tomoyuki*; Ijiri, Yuji*; Sugihara, Yutaka*
PNC TJ7205 94-001, 180 Pages, 1994/05
no abstracts in English
Ijiri, Yuji*; Nago, Makito*; Kinomura, Koji*; Sugihara, Yutaka*; Shigehiro, Michiko*; Sato, Masaru*; Kunimaru, Takanori
no journal, ,
This paper presents the in-situ measurement data and the results of simulation analyses in order to develop technologies for monitoring rock behaviors using tiltmeters placed near ground surface. From the data, it is shown that the tiltmeters are able to capture the rock behaviors due to shaft excavations and concrete placements and are very sensitive to capture earthquakes, change in barometrical pressure and tide as well as the movements of heavy-construction-equipments. The applicability of inverse analysis for identifying the rock properties using tilting displacement data associated with construction activity is demonstrated by elastic analyses. In addition, the applicability of tiltmeters for monitoring high-permeable zones is also demonstrated by Hydro-Mechanical coupling analysis, because the groundwater flow toward the shaft along high-permeable zone cause an increase in the rate of tilting displacement and change in displacement mode.
Ijiri, Yuji*; Hatsuyama, Yoshihiro*; Nago, Makito*; Sato, Masaru*; Sanoki, Satoru*; Kunimaru, Takanori; Sugita, Yutaka
no journal, ,
no abstracts in English
