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城 まゆみ*; 小野 誠*; 中山 雅; 朝野 英一*; 石井 智子*
Geological Society Special Publications, 482, 16 Pages, 2018/09
被引用回数:2 パーセンタイル:20.94(Geology)The phenomena of "piping and erosion" are serious problems for the integrity of the buffer material as an element of engineered barrier systems in geological disposal for high-level radioactive waste. In this study, the outflow behavior and condition in buffer material has been investigated using a test pit drilled in host rock at Horonobe Underground Research Laboratory to acquire the knowledge to consider countermeasures to contain the outflow of the buffer material. The following are results. (1) The phenomena of "piping and erosion" occurred irrespective of injection flow rate. However, when the rate is small, it is considered that buffer material can be self-repairing and the erosion of buffer material can be suppressed. (2) When injection water contains a lot of electrolyte, the surface of buffer material peels off and precipitates, possibly suppressing waterproof performance. (3) It is considered that bentonite pellets are effective for countermeasures against buffering "piping and erosion".
吉田 英一*; 山本 鋼志*; 刈茅 孝一*; 松井 裕哉
no journal, ,
本報告は、名古屋大学を中心とするグループが開発したコンクリーション化剤を利用し、幌延深地層研究所地下施設坑道周辺に存在するEDZの止水を目的とした試験を行った結果について述べたものである。