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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,5

Studies about strength recovery and generalized relaxation behavior of rock, 5

真田 昌慶; 岸 裕和*; 杉田 裕; 林 克彦*; 武部 篤治*; 大久保 誠介*

Sanada, Masanori; Kishi, Hirokazu*; Sugita, Yutaka; Hayashi, Katsuhiko*; Takebe, Atsuji*; Okubo, Seisuke*

本研究では、「強度回復試験」,「一般化応力緩和試験」,「引張強度試験」を、稚内層珪質泥岩を用いて実施した。その結果、強度回復を表す構成方程式で適切な定数の値を用いることにより、押し込み試験での軸応力の変化を表現できることを示した。一般化応力緩和挙動については気乾状態と湿潤状態で試験を行った。粘弾性的な挙動は、気乾状態よりも湿潤状態の方が、また、一般化応力緩和試験を開始するまでの載荷速度が大きいほど顕著であることがわかった。さらに引張特性については圧裂引張試験と一軸引張試験を実施した。圧裂引張強度については層理面に対する載荷方向の影響が大きいことがわかった。

In this study, strength recovery, generalized stress relaxation and two tensile strength tests were carried out using shale sampled in the Wakkanai-formation. As the results, by using the value of a suitable constant with the constitutive equation showing strength recovery, it was showed that change of the axial stress in a compacting test could be expressed. About the generalized relaxation, it examined by the air dried and the saturated condition. Visco-elastic behavior was more remarkable in saturated condition than the air dried. Moreover, when the loading rate up to the starting point of the generalized relaxation test was large, the influence on visco-elastic behavior was remarkable. About tensile characteristics, a splitting tensile strength test and a uniaxial tensile strength test were carried out. About splitting tensile strength, it turned out that the influence of the loading direction on a bedding plane is great.

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