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Journal of Mining Science

, Volume 41, Issue 4, pp 291–297 | Cite as

Acoustic Emission of Coal in the Postlimiting Deformation State

  • A. S. Voznesenskii
  • M. N. Tavostin
Geomechanics

Abstract

The features of acoustic emission in coal samples in the state of pre- and postlimiting deformation are considered. It is shown that in the postlimiting deformation stages and in the transient period, a contrary change is observed in a correlation coefficient of the acoustic emission activity \(\dot N_\Sigma\) recorded in the upper and lower portions of a sample; whereas in the prelimiting deformation stages, this change is consistent. It is proposed to recognize the stages of deformation by the correlation coefficient of \(\dot N_\Sigma\) recorded in different zones: a positive coefficient corresponds to the prelimiting stage of deformation, and a negative one corresponds to the postlimiting stage.

Keywords

Coal acoustic emission activity postlimiting deformation correlation coefficient 

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Copyright information

© Springer Science+Business Media, Inc. 2005

Authors and Affiliations

  • A. S. Voznesenskii
    • 1
  • M. N. Tavostin
    • 2
  1. 1.Moscow State Mining UniversityMoscowRussia
  2. 2.“Podzemgazprom” Joint-Stock CompanyMoscowRussia

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