Rock and Soil Mechanics ›› 2022, Vol. 43 ›› Issue (3): 749-760.doi: 10.16285/j.rsm.2021.0879

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Research on the failure precursors of layered slate based on multifractal characteristics of acoustic emission

SUN Bo1, REN Fu-qiang2, 3, LIU Dong-qiao3   

  1. 1. School of Mining Engineering, University of Science and Technology Liaoning, Anshan, Liaoning 114000, China; 2. School of Civil Engineering, University of Science and Technology Liaoning, Anshan, Liaoning 114000, China; 3. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Beijing 100083, China
  • Received:2021-06-11 Revised:2021-12-15 Online:2022-03-22 Published:2022-03-22
  • Supported by:
    This work was supported by the National Natural Science Foundation of China(52074299), the State Key Laboratory for GeoMechanics and Deep Underground Engineering, China University of Mining & Technology, Beijing (SKLGDUEK2128) and the Excellent Young Scientific and Technological Talents Project of University of Science and Technology, Liaoning(2021YQ02).

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Abstract: In order to explore the failure precursors of layered slate, uniaxial compression tests of five groups of slate with different bedding angles (? = 0o, 30o, 45o, 60o, 90o) were carried out. The failure modes, acoustic emission (AE) parameters and multifractal characteristics were analyzed, and the relationship between multifractal spectrum width (Δ?) and damage evolution was discussed. In addition, the precursor and warning time of final failure based on multifractal were determined. The results show that when the ? increases from 0o to 90o, the failure modes of slate change from tension-splitting failure to splitting-shear, then to shear slip, and finally to tension-splitting. Moreover, the abrupt increase of AE counts and the continuous increase of low-frequency (LF) and high-amplitude (HA) signals can be identified as precursors. And the proportion of LF-HA signals in the crack coalescence stage decreases first and then increases with the increase of ?. The sudden decrease and the following increase of Δ? can also be the precursor. Furthermore, the sudden increase time of Δ? is ahead of the damage mutation. Specifically, with the ? increasing, the early warning time of Δ? increases first, then decreases and then rebounds. The slate with ? = 30o has the longest early warning time.

Key words: slate, bedding angle, acoustic emission, multifractal, failure precursor

CLC Number: 

  • TU 458
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