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岩石の強度回復特性・一般化応力緩和挙動に関する研究,2(委託研究)

Studies about strength recovery and generalized relaxation behavior of rock, 2 (Contract research)

大久保 誠介*; 林 克彦; 小林 保之; 平本 正行*

Okubo, Seisuke*; Hayashi, Katsuhiko; Kobayashi, Yasushi; Hiramoto, Masayuki*

支保工が設置される堆積岩系の地下坑道岩盤は支保内圧と地圧の双方が作用し、一般に時間の経過に伴い強度が回復するという特性を有していることが知られている。この強度回復特性は空洞の安定性や処分場閉鎖後の長期力学挙動の評価において配慮すべきものであり、本研究は、幌延深地層研究計画のコア試料をもとに実験的な検討を通じて、強度回復特性,一般応力緩和挙動や引張特性について今後の定量化に向けたデータの蓄積と分析を実施したものである。

It is generally known that the rock has the properties of strength recovery by elapse of time around the tunnel inside sedimentary rock with ground support due to inner pressure and ground pressure. The properties of strength recovery must be taken into account of the estimation about cavity shape stability or the long-term dynamical behavior of closed disposal ground. Our research study is focusing on the properties of strength recovery, generalized relaxation behavior and the characteristics of tensile strength by experiments using boring cores obtained from the Horonobe Underground Research Laboratory so as to improve the modeling for future stage.

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