STUDY OF SPATIAL DISTRIBUTION AND FRACTAL DIMENSION OF AE EVENTS DURING ROCK FRACTURE
Rock is one kind of typical inhomogeneous brittle material with various deficiencies such as micro-cracks and voids. It will generate a large number of acoustic emission (AF) signals during damage process, when the rock is subjected to external loading. In this investigation,AE location technique is applied to study the three dimensional (3D) evolutionary process of micro-cracks initiation, propagation and coalescence during rock failure process. Meanwhile, the fractal characteristic of AE events is provided. The experimental results show that spatial distribution of AE located events enable to directly reflect the micro-crack initiation, propagation direction and spatial evolutionary. It is consistent between AE locate result and rock damage result eventually. In addition, although the fractal dimensions for different rock samples are not kept the same during rock fracture, they all drop to the minimum value before rock failure. This pnenomenon is an important referred indicator for the tremendous rock failure, which is helpful to the study of rock failure mechanism and in-situ rock mass monitoring.
JIAN-PO LIU YUAN-HUI LI YU-JIANG YANG
School of Resources & Civil Engineering, Northeastern University Shenyang, 110004, P.R.China
国际会议
The 7th International Symposium on Rockburst and Seismicity in Mines(2009年第七届国际岩爆与微振动性学术研讨会)
大连
英文
165-170
2009-08-21（万方平台首次上网日期，不代表论文的发表时间）