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采用颗粒流软件PFC2D从细观上对侧限压缩下的非均匀花岗岩岩样进行了声发射(AE)时空特征研究.结果表明,随着围压的增加,岩样破坏的峰值荷载提高,破坏形式由突发失稳逐渐转变为渐进式破坏.岩样声发射的峰值出现时间和岩样的峰值破坏不同步,存在一定的滞后,大约出现在峰后90%峰值荷载处.在岩样破坏前均存在声发射的相对平静期,围压的大小不仅对声发射的时序特征有显著影响,而且声发射相对平静期也随着围压的增加而延长.通过对应变能的追踪,发现在声发射相对平静期存在应变能被吸收的现象,验证了在岩石破坏过程中存在损伤愈合过程.
Using the particle flow software PFC2D, the temporal and spatial characteristics of acoustic emission (AE) of non-uniform compressional granite samples under confined pressure were studied numerically. The results show that with the increase of confining pressure, the peak load of rock failure increases, And the form gradually changes from sudden failure to gradual destruction.The peak time of rock acoustic emission is not synchronous with the peak destruction of rock sample with some delay and appears at peak load of about 90% Before the existence of acoustic emission relatively quiet period, the size of the confining pressure not only has a significant impact on the timing characteristics of acoustic emission, but also the relative quiet period of acoustic emission is also extended with the increase of confining pressure.By tracking the strain energy, There is a phenomenon that the strain energy can be absorbed during the relatively quiet period of acoustic emission, which verifies that there is a damage healing process during rock failure.