›› 2011, Vol. 32 ›› Issue (7): 2111-2116.

• Geotechnical Engineering • Previous Articles     Next Articles

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

XU Fu-le1, 2，WANG En-yuan1, 2，SONG Da-zhao1, 2，SONG Xiao-yan1, 2，WEI Ming-yao1, 2   

  1. 1. State Key Laboratory of Coal Resources and Mine Safety, China University of Mining & Technology, Xuzhou, Jiangsu 221008, China; 2. School of Safety Engineering, China University of Mining & Technology, Xuzhou, Jiangsu 221008, China
  • Received:2010-07-15 Online:2011-07-10 Published:2011-06-30

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Abstract: 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.

Key words: coal-rock failure, strength of acoustic emission(AE), long-range correlation, multifractals

CLC Number: 

  • TU 452
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