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結晶質岩を対象とした長期岩盤挙動評価手法に関する研究; 2014年度(委託研究)

Study on crystalline rock aiming at evaluation method of long-term behaviour of rock mass; FY2014 (Contract research)

福井 勝則*; 羽柴 公博*; 佐藤 稔紀; 桑原 和道; 高山 裕介

Fukui, Katsunori*; Hashiba, Kimihiro*; Sato, Toshinori; Kuwabara, Kazumichi; Takayama, Yusuke

高レベル放射性廃棄物の地層処分において、処分坑道の力学的安定性は、建設・操業時はもとより閉鎖後も千年程度にわたって要求される。一方、処分坑道をとりまく岩石や岩盤は、クリープや応力緩和などの力学的な時間依存性挙動を示すことが知られており、その挙動を把握することは処分坑道の安定性評価における課題となっている。この課題を受け、調査研究開発を進めてきた。試験は中断することなく、試験期間は17年を越えた。また、湿潤状態かつ常温から100$$^{circ}$$C程度での、岩石の変形・破壊特性および時間依存性を調べるための試験方法について検討した。さらに、室内試験結果と地圧測定結果を用いて、三軸応力下での岩石の長期強度について検討した。

With respect to high-level radioactive waste disposal, knowledge of the long-term mechanical stability of shafts and galleries excavated in rock is required, not only during construction and operation but also over a period of thousands of years after closure. On the other hand, it is known that rock and the rock mass surrounding the disposal gallery shows time dependent behavior such as creep or the stress-relaxation. It becomes the issue in the stability evaluation of the disposal gallery to grasp the behavior. About this issue, we pushed forward research development. In the fiscal year of 2014, the creep test was continuously conducted and the total testing time exceeded 17 years. The testing equipment and procedure were examined to investigate the deformation, failure and time-dependency of rock under wet conditions and between room temperature and 100$$^{circ}$$C. The long-term strength of rock under triaxial stress state was researched with the aid of laboratory testing results and in situ stress measurement.

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