岩石微破裂进程的自组织临界特征探讨

Discussion on Self-organized Criticality in Rock Failure Progress

运用RFPA2D作为研究手段对岩石在单轴压缩条件下破裂过程的自组织行为作了数值模拟,再现了岩石破裂过程中的应力积累(stress buildup)、应力转移(stress transference)和应力阴影(stress shadow)等“3S”现象,探讨了自组织临界特征,澄清了临界自组织现象等概念。研究结果表明,岩石破裂过程中的自组织行为是一个动态力学过程,并不一定只是在自组织临界状态点之后才发生,而是在临界状态点附近前后都能发生,只不过显现程度各有差异,临界状态点之后现象更为显著。

In this paper, self-organization behavior in rock failure progress is simulated by RFPA^20 code under uniaxial compression test. The results visually present ‘3S’ phenomena （stress buildup, stress transference and stress shadow） in the whole failure progress. Some beneficial discussion on self-organized critical characteristics is made in the subsequent text, which has clarified some concepts such as selforganized criticality phenomena and so on. Through this study, it indicates that self-organization behaviour in rock fracture is one dynamic mechanical process, which occurs not only after self-organized critical point but near it, viz. before or after it, only mechanical behavior is different, it is more remarkable after than before.