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Journal Articles

Consistent robin boundary enforcement of particle method for heat transfer problem with arbitrary geometry

Wang, Z.; Duan, G.*; Matsunaga, Takuya*; Sugiyama, Tomoyuki

International Journal of Heat and Mass Transfer, 157, p.119919_1 - 119919_20, 2020/08

 Times Cited Count:3 Percentile:65.8(Thermodynamics)

Journal Articles

Development of in situ stress estimation method based on the measured convergence and geological observations

Kamemura, Katsumi*; Aoyagi, Kazuhei; Nago, Makito*; Sugawara, Kentaro*

Dai-45-Kai Gamban Rikigaku Ni Kansuru Shimpojiumu Koenshu (CD-ROM), p.43 - 48, 2018/01

In situ stress state is very important for the design of deep underground facility of high-level radioactive waste disposal repository. This study establishes a practical and effective method for estimating in situ stress state based on the measured convergence and detailed geological observations during gallery excavation. The convergence was measured in various directions of the loop gallery at 350m depth of the Horonobe URL; this allows determination of the stress state corresponding to the rock mass behavior in 120m $$times$$ 200m area. In situ stress state estimated by the back analysis considering existing faults and fractures showed a good agreement with that of estimated from hydraulic fracturing method.

Journal Articles

Estimation of rock mass stress state based on the convergence measurement result during tunnel excavation

Kamemura, Katsumi*; Aoyagi, Kazuhei; Nago, Makito*; Sugawara, Kentaro*; Matsubara, Makoto*

Dai-14-Kai Iwa No Rikigaku Kokunai Shimpojiumu Koen Rombunshu (Internet), 6 Pages, 2017/01

In the design of deep underground structures such as high-level radioactive waste disposal repositories, the estimation of rock mass stress state is important as well as the estimation of mechanical characteristics of rock mass. This study establishes a practical and effective method for estimating in situ stress based on the convergence measurement results obtained during gallery construction of URL. The convergence was measured in various directions of the URL loop gallery at 350 m depth, and this will allow determination of the stress state over a large area using a back analysis method. In order to improve the accuracy of initial stress estimation, the relationship between convergence measurement results and geological situation of existing fractures were studied. The analysis results show good agreement with the in situ stress state results reported in previous studies and confirm the applicability of the proposed method.

Journal Articles

Estimation of initial stress based on the convergence measurement result during tunnel excavation

Kamemura, Katsumi*; Fujita, Tomo; Aoyagi, Kazuhei; Nago, Makito*; Shirase, Mitsuyasu*; Sugawara, Kentaro*

Dai-44-Kai Gamban Rikigaku Ni Kansuru Shimpojiumu Koenshu (CD-ROM), p.109 - 114, 2016/01

How to estimate the initial stress state as well as a mechanical characteristic of rock mass is important in the design of deep underground structures. Some stress measurement methods using borehole, which methodology and evaluation method have been discussed in detail, are carried out if necessary. However, obtained results are often varying widely, so the evaluation of initial stress is difficult. Here, the initial stress state corresponding to the rock mass behavior of about 120m$$times$$200m area is evaluated using the convergence measurement results during tunnel excavation in 350m depth. Analysed result corresponded to that of other method, so the validity of the proposed method was shown.

JAEA Reports

Estimation of longitudinal and transverse dispersivities in the Twin Lake natural gradient tracer tests

Takeda, Seiji; Moltyaner, G. L.*

JAERI-Research 98-031, 28 Pages, 1998/06

JAERI-Research-98-031.pdf:1.29MB

no abstracts in English

Journal Articles

Estimation of most probable power distribution in BWRs by least squares method using in-core measurements

Journal of Nuclear Science and Technology, 25(9), p.731 - 740, 1988/09

 Times Cited Count:10 Percentile:71.28(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Evaluation of delayed neutron data for thermal fission of U-235 based on integral experiments at semi-homogeneous experiment

; Akino, Fujiyoshi;

Journal of Nuclear Science and Technology, 25(9), p.673 - 681, 1988/09

 Times Cited Count:8 Percentile:65.79(Nuclear Science & Technology)

no abstracts in English

Journal Articles

The effective nuclear charge model; IX, On the transferability of effective nuclear charges defined from homonuclear diatomic molecules

Spectrochimica Acta, Part A, 43(9), p.1147 - 1150, 1987/09

no abstracts in English

Journal Articles

Estimation of irradiation history of a spent fuel by gamma-ray spectroscopy

Tasaka, Kanji

Nuclear Technology, 29(2), p.239 - 248, 1976/02

 Times Cited Count:1

no abstracts in English

Journal Articles

Adjustment to cross section data to fit integral experiments by least squares method

;

Journal of Nuclear Science and Technology, 12(11), p.663 - 680, 1975/11

 Times Cited Count:14

no abstracts in English

Oral presentation

Analysis of LIBS spectra using the least-square method for two-dimensional distribution of simulated fuel debris

Akaoka, Katsuaki; Oba, Masaki; Miyabe, Masabumi; Wakaida, Ikuo

no journal, , 

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