›› 2009, Vol. 30 ›› Issue (9): 2559-2563.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Study on b-value and fractal dimension of acoustic emission during rock failure process

LI Yuan-hui1, 2, LIU Jian-po1, ZHAO Xing-dong1, YANG Yu-jiang1   

  1. 1. College of Resources and Civil Engineering, Northeastern University, Shenyang 110004, China; 2. Key Laboratory of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China
  • Received:2008-04-18 Online:2009-09-10 Published:2010-03-24

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Abstract:

Acoustic emission (AE) experiments of rock failure are carried out under uniaxial compression loading with AE location technique. Relationships between different stress levels with spatial distribution fractal dimension and b-value of AE events are studied. The results show that fractal dimension D and b-value of AE events can directly reflect the evolutionary process of microcracks initiation and propagation. In the initial stage of loading, on account of high proportion of small scale microcracks, the value of fractal dimension and b-value are higher and appear fluctuating, and in some rock samples they are increasing. With the increase of load, the distribution of microcrack turns from random to order, large scale microcrack are increasing, acoustic emission location events begin to cluster, fractal dimension and b-value begin to drop much quickly. The fractal dimension and b-value reach to the minimum value at the critical point of rock failure. During rock failure process, variable tendencies of fractal dimension and b-value are similar. Although it is difficult to confirm the minimum value of fractal dimension and b-value in practical application, continually declining of the two parameters can be seen as precursors of rock failure. Consequently, fractal dimension and b-value can be combined used to improve the accuracy of rock mass monitoring and forecasting in-situ.

Key words: acoustic emission, rock failure, fractal dimension, b-value

CLC Number: 

  • TU 45
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