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

Cited 49 time in webofscience Cited 0 time in scopus
  • Hit : 309
  • Download : 0
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 sigma (c), and the crack damage threshold was identified at 0.62-0.84 sigma (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 sigma (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.
Publisher
SPRINGER WIEN
Issue Date
2015-03
Language
English
Article Type
Article
Citation

ROCK MECHANICS AND ROCK ENGINEERING, v.48, no.2, pp.495 - 508

ISSN
0723-2632
DOI
10.1007/s00603-014-0590-0
URI
http://hdl.handle.net/10203/195351
Appears in Collection
CE-Journal Papers(저널논문)
Files in This Item
There are no files associated with this item.
This item is cited by other documents in WoS
⊙ Detail Information in WoSⓡ Click to see webofscience_button
⊙ Cited 49 items in WoS Click to see citing articles in records_button

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0