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花崗岩のアルカリ変質における反応・拡散複合評価

Reactive-transport evaluation for alteration of granite under alkaline conditions

桐野 祐介*; 中嶋 悟*; 横山 正*; 笹本 広   

Kirino, Yusuke*; Nakashima, Satoru*; Yokoyama, Tadashi*; Sasamoto, Hiroshi

高レベル放射性廃棄物の地層処分において、地下坑道の掘削・施工時における湧水抑制対策にセメント系グラウト材を用いた場合、高アルカリ性溶液が発生し、岩盤が変質することが懸念されている。本研究では、変質による岩石組織の変化を解明するため、花崗岩ブロック(10$$times$$10$$times$$5mm)のアルカリ変質試験を行った。この試験において、花崗岩ブロック表面を亀裂表面、ブロック内部をマトリクスとみなし、変質生成物の分布を加熱変質試験及び反応拡散シミュレーションを用いて調べた。

Cementitious grout materials will be used to reduce groundwater inflow during excavation and construction of drifts for deep geological disposal of high lever radioactive waste. High alkaline solution derived from cementitious materials could alter the host rock surrounding the engineered barriers. In the present study, the experiments of interactions between the alkaline solution and the granitic rock (10 $$times$$ 10 $$times$$ 5 mm block sample) were conducted to understand the evolution of rock properties. The surface of granitic block sample is assumed the fresh fracture surface and the inside of block sample is regarded as rock matrix. Evolution and distribution of alteration products were estimated by both the accelerated laboratory experiments and the computer simulations considering reactive-transport processes.

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