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Takayama, Yusuke; Sato, Daisuke*; Kikuchi, Hirohito*
Genshiryoku Bakkuendo Kenkyu (CD-ROM), 29(2), p.101 - 111, 2022/12
Swelling pressure tests have been conducted to understand the swelling properties of bentonite which is planned to be used as a buffer material in repositories for the geological disposal of radioactive waste. It has been reported that the swelling pressure obtained by swelling pressure test increases monotonically or temporarily decreases after increasing with the passage of the time depending on the initial water content. In this study, swelling pressure tests were conducted under several different initial water content conditions, and the change in wet density distribution inside the specimen during the swelling pressure tests was observed by X-ray CT measurement. It was confirmed that the presence or absence of collapse behavior and its magnitude affect the shape of the change in swelling pressure. When the collapse deformation was large, the amount of temporary decrease in swelling pressure was large. On the other hand, swelling pressure increased monotonically when there was no deformation due to collapse.
Takayama, Yusuke; Kikuchi, Hirohito*
Doboku Gakkai Rombunshu, C (Chiken Kogaku) (Internet), 77(3), p.302 - 313, 2021/09
Numerous swelling pressure tests have been conducted to understand the swelling properties of bentonite which is planned to be used as a buffer material in repositories for the geological disposal of radioactive waste. In this study, in order to clarify the cause of the decrease in swelling pressure during the swell-in pressure test period, the change in wet density distribution inside the specimen during the swelling pressure test was observed by X-ray CT measurement. It was supposed that this phenomenon was caused by the collapse inside the specimen. Furthermore, in order to confirm that collapse is generated by water absorption, the swelling deformation test was carried out under various load conditions. As a result, it was confirmed that collapse occurs even under the load conditions that are equal to or slightly smaller than the swelling pressure. These test data are expected to be used for validation of coupled analysis codes for evaluating the mechanical behavior of disposal facilities during re-saturation period.
Fujita, Takaaki; Kamada, Yutaka; Ishida, Shinichi; Neyatani, Yuzuru; Oikawa, Toshihiro; Ide, Shunsuke; Takeji, Satoru; Koide, Yoshihiko; Isayama, Akihiko; Fukuda, Takeshi; et al.
Nuclear Fusion, 39(11Y), p.1627 - 1636, 1999/11
Times Cited Count：93 Percentile：91.91(Physics, Fluids & Plasmas)no abstracts in English
Fujita, Takaaki; Kamada, Yutaka; Ishida, Shinichi; Neyatani, Yuzuru; Oikawa, Toshihiro; Ide, Shunsuke; Takeji, Satoru; Koide, Yoshihiko; Isayama, Akihiko; Fukuda, Takeshi; et al.
IAEA-CN-69/EX1/2 (CD-ROM), 8 Pages, 1999/00
no abstracts in English
Fukuda, Takeshi; JT-60 Team
Physics of Plasmas, 2(6), p.2249 - 2255, 1995/06
Times Cited Count：11 Percentile：46.34(Physics, Fluids & Plasmas)no abstracts in English
p H-mode induced by a mini-collapse; Kamada, Yutaka; Ozeki, Takahisa; Ishida, Shinichi; Takizuka, Tomonori; Neyatani, Yuzuru; Tokuda, Shinji; JT-60 Team
22nd European Physical Society Conference on Controlled Fusion and Plasma Physics,Vol. 19C,Part IV, 0, p.4.033 - 4.036, 1995/00
no abstracts in English
