一軸圧縮応力下における時間依存性挙動
岩石のPost-failure Regionでの挙動 (第1報)
1987 年 103 巻 1189 号 p. 177-181
詳細
1987 年 103 巻 1189 号 p. 177-181
Uniaxial compression tests were performed upon 5 sample rocks to investigate effect of loading rate by constant strain rate method for a class I rock and stress-feedback method for the other class II rocks. Results show that strength increases with loading rate, and that stress-strain curve in the post-failure region at a higher loading rate will enclose those at lower rates.
The unloading compliance of specimen in the post-failure region was investigated by repeated unloading-loading processes. It is found that the inverse of compliance 1/γ decreases linearly with stress.
Based on the test results, a simple model which explains the effect of loading rate and the compliance change in the postfailure region was proposed. The model can also explain behaviours under constant strain (relaxation) and constant stress (creep) qualitatively, though it has some incompletenesses such as the inability of explaining strain hardening phenomenon.
