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http://dx.doi.org/10.9711/KTAJ.2019.21.5.657

Analysis of acoustic emission parameters according to failure of rock specimens  

Lee, Jong-Won (Multi Disaster Countermeasure Organization (MDCO), Korea Institute of Geoscience and Mineral Resources (KIGAM))
Oh, Tae-Min (Department of Civil and Environmental Engineering, Pusan National University (PNU))
Kim, Hyunwoo (Multi Disaster Countermeasure Organization (MDCO), Korea Institute of Geoscience and Mineral Resources (KIGAM))
Kim, Min-Jun (Multi Disaster Countermeasure Organization (MDCO), Korea Institute of Geoscience and Mineral Resources (KIGAM))
Song, Ki-Il (Department of Civil Engineering, Inha University)
Publication Information
Journal of Korean Tunnelling and Underground Space Association / v.21, no.5, 2019 , pp. 657-673 More about this Journal
Abstract
A monitoring method based on acoustic emission (AE) sensor has been widely used to evaluate the damage of structures in underground rock. The acoustic emission signal generated from cracking in material is analyzed as various acoustic emission parameters in time and frequency domain. To investigate from initial crack generation to final failure of rock material, it is important to understand the characteristics of acoustic emission parameters according to the stress ratio and rock strength. In this study, uniaxial compression tests were performed using very strong and weak rock specimen in order to investigate the acoustic emission parameters when the failure of specimen occurred. In the results of experimental tests, the event, root-mean-square (RMS) voltage, amplitude, and absolute energy of very strong rock specimen were larger than those of the weak rock specimen with an increase of stress ratio. In addition, the acoustic emission parameters related in frequency were more affected by specification (e.g., operation and resonant frequency) of sensors than the stress ratio or rock strength. It is expected that this study may be meaningful for evaluating the damage of underground rock when the health monitoring based on the acoustic emission technique will be performed.
Keywords
Acoustic emission (AE); Parameter; Uniaxial compressive strength; Failure monitoring;
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Times Cited By KSCI : 3  (Citation Analysis)
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