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論文

Assessing the long-term behavior of a radioactive waste disposal tunnel with a damage model incorporating chemical degradation effects

小林晃*; 千々松正和*; 藤田朝雄; 山本清仁*

Proceedings of 3rd International Conference on Coupled T-H-M-C Processes in Geo-systems; Fundamentals, Modeling, Experiments and Applications (GeoProc 2008), p.621 - 628, 2008/06

地層処分場のニアフィールドの力学的な変遷を評価するために、岩石の化学的劣化による力学的挙動の変化を予測するためのダメージモデルについて検討した。解析結果から、化学的な劣化により強度が減少し、破壊過程も表面の亀裂による卓越可能性があることがわかった。

論文

Hydraulic modelling of unsaturated zones around three openings at the argillaceous Tournemire site (France)

上原真一*; 小林晃*; 千々松正和*; 大西有三*; 藤田朝雄; Rejeb, A.*

Proceedings of 3rd International Conference on Coupled T-H-M-C Processes in Geo-systems; Fundamentals, Modeling, Experiments and Applications (GeoProc 2008), p.419 - 425, 2008/06

This paper reports the results of hydraulic modelling under unsaturated condition at the domain around openings in argillaceous rock formation at the Tournemire site, France, in order to determine permeability value suitable to explain measured distribution of saturation ratio. We performed modelling with finite element method with consideration of seasonal changes of humidity in the openings. Results of modelling could simulate reasonably well the characteristics of the measured distribution. Modelling results with permeability 10 $^{-19}$ m $^{2}$ to 10 $^{-20}$ m $^{2}$ show good agreement with the measurement results. This study is a part of works for Task C of the DECOVALEX-THMC project.

論文

Influence of excavation of disposal tunnel on the near-field coupled thermal, hydraulic and mechanical phenomena

千々松正和*; 塚田泰博*; 小林晃*; 藤田朝雄

Proceedings of 3rd International Conference on Coupled T-H-M-C Processes in Geo-systems; Fundamentals, Modeling, Experiments and Applications (GeoProc 2008), p.381 - 390, 2008/06

In the international DECOVALEX-THMC project, the influence of coupled thermal, hydraulic and mechanical (THM) phenomena on the safety of the near-field of a typical hypothetical geological repository is studied. The hypothetical geological repository would be located in the Canadian Shield, with horizontal drift geometry, and the copper container for the Candu fuel emplaced in the drift would be surrounded by MX-80 bentonite. Properties of bentonite are calibrated against results from laboratory experiments by SKB and the CEA mock-up test. Furthermore, damage model of rock mass is used for the express the effect of excavation. By using calibrated bentonite model and damage model, influence of excavation tunnel is studied. As results, it is known that effect of property change of rock mass due to excavation is very low compared with property of bentonite itself.