Rock Mechanics and Rock Engineering

, Volume 48, Issue 2, pp 495–508 | Cite as

A Comparative Evaluation of Stress–Strain and Acoustic Emission Methods for Quantitative Damage Assessments of Brittle Rock

  • Jin-Seop Kim
  • Kyung-Soo Lee
  • Won-Jin Cho
  • Heui-Joo Choi
  • Gye-Chun ChoEmail author
Original Paper


The purpose of this study is to identify the crack initiation and damage stress thresholds of granite from the Korea atomic energy research institute’s Underground Research Tunnel (KURT). From this, a quantitative damage evolution was inferred using various methods, including the crack volumetric strain, b value, the damage parameter from the moment tensor, and the acoustic emission (AE) energy. Uniaxial compression tests were conducted, during which both the stress–strain and AE activity were recorded simultaneously. The crack initiation threshold was found at a stress level of 0.42–0.53 σ c, and the crack damage threshold was identified at 0.62–0.84 σ c. The normalized integrity of KURT granite was inferred at each stress level from the damage parameter by assuming that the damage is accumulated beyond the crack initiation stress threshold. The maximum deviation between the crack volumetric strain and the AE method was 16.0 %, which was noted at a stress level of 0.84 σ c. The damage parameters of KURT granite derived from a mechanically measured stress–strain relationship (crack volumetric strain) were successfully related and compared to those derived from physically detected acoustic emission waves. From a comprehensive comparison of damage identification and quantification methods, it was finally suggested that damage estimations using the AE energy method are preferred from the perspectives of practical field applicability and the reliability of the obtained damage values.


Damage parameter Acoustic emission Crack stress threshold b value Moment tensor Crack volumetric strain AE energy Granite 



This work was supported by the Nuclear Research & Development Program of the Korea Science and Engineering Foundation (KOSEF) through a grant funded by the Korean government (MEST).


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Copyright information

© Springer-Verlag Wien 2014

Authors and Affiliations

  • Jin-Seop Kim
    • 1
  • Kyung-Soo Lee
    • 1
  • Won-Jin Cho
    • 1
  • Heui-Joo Choi
    • 1
  • Gye-Chun Cho
    • 2
    Email author
  1. 1.Radioactive Waste Disposal Research DivisionKorea Atomic Energy Research Institute (KAERI)DaejeonKorea
  2. 2.Department of Civil and Environmental EngineeringKorea Advanced Institute of Science and Technology (KAIST)DaejeonKorea

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