岩土力学2011，Vol.32Issue(6)：1886-1890,5.
考虑不均质度的岩石声发射数值模拟研究
Study of numerical simulation of acoustic emission in rock of inhomogeneity
宿辉 1党承华 2李彦军2
作者信息
- 1. 北京科技大学土木与环境学院,北京,100083
- 2. 河北工程大学水电学院,河北邯郸,056021
- 折叠
摘要
Abstract
The failure process of rock in uniaxial compression tests is simulated by using the particle flow code(PFC).Fish language embedded within PFC2D is used to generate random imperfections and to develop the rock numerical specimens with different homogeneous degrees.The results show that inhomogeneous degree has great influence on characteristics of acoustic emission in rock.With the increase of inhomogeneous degree, peak strength of rock specimens decreases and the total number of AE increases gready.The spatial distribution of AE becomes more extensively.Meanwhile, AE of rock samples appear earlier and sustain for longer duration.The intensity of AE after the peak failure retains higher level.The maximum intensity of AE under uniaxial stress state lags behind the peak damage to different extents.With the increase of inhomogeneous rock, the hysteresis effect of AE becomes obvious which suggests that rock failure appears earlier than the maximum intensity of AE.关键词
声发射/岩石破坏/颗粒流/微裂缝/残余强度Key words
acoustic emission/ rock failure/ particle flow code/ microcrack/ residual strength分类
建筑与水利引用本文复制引用
宿辉,党承华,李彦军..考虑不均质度的岩石声发射数值模拟研究[J].岩土力学,2011,32(6):1886-1890,5.
