Long-range correlation and multifractal distribution of acoustic emission of coal-rock

被引：0
|
作者：
Xu Fu-le [1 ,2 ]
Wang En-yuan [1 ,2 ]
Song Da-zhao [1 ,2 ]
Song Xiao-yan [1 ,2 ]
Wei Ming-yao [1 ,2 ]
机构：
[1] China Univ Min & Technol, State Key Lab Coal Resources & Mine Safety, Xuzhou 221008, Jiangsu, Peoples R China
[2] China Univ Min & Technol, Sch Safety Engn, Xuzhou 221008, Jiangsu, Peoples R China
来源：
ROCK AND SOIL MECHANICS | 2011年 / 32卷 / 07期
关键词：
coal-rock failure; strength of acoustic emission(AE); long-range correlation; multifractals;
D O I：
暂无
中图分类号：
P5 [地质学];
学科分类号：
0709 ; 081803 ;
摘要：
Acoustic emission tests of coal-rock specimens under uniaxial compression were carried out; then the long-range correlation and multifractal characteristics of acoustic emission strength sequence were analyzed by multifractal detrended fluctuation analysis method (MF-DFA). On this basis, the trend of long-range correlation exponent H of AE strength sequence with different stress levels was studied. The results show that the inner fluctuation of AE sequence is a well-regulated multifractals, which is rather a long-range correlated process determined by intrinsic self-similar properties and not complete random on time scale. The trend of AE parameter H corresponds well with the process of coal-rock fracture development; the ` maximum-decrescence' model of which can be used as a precursory factor of coal-rock failure. The results provide a theoretical basis and method for monitoring and forecasting coal-rock stable condition based on acoustic emission in site.
引用
收藏
页码：2111 / +
页数：7
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