Geomechanics and Engineering

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Acoustic emission characteristics during damage-zone formation around a circular opening

  • Jong-Won Lee (Research Institute of Industrial Technology, Pusan National University) ;
  • Eui-Seob Park (Deep Subsurface Storage & Disposal Research Center, Korea Institute of Geoscience and Mineral Resources (KIGAM)) ;
  • Junhyung Choi (Deep Subsurface Storage & Disposal Research Center, Korea Institute of Geoscience and Mineral Resources (KIGAM)) ;
  • Tae-Min Oh (Department of Civil and Environmental Engineering, Pusan National University) ;
  • Min-Jun Kim (Deep Subsurface Storage & Disposal Research Center, Korea Institute of Geoscience and Mineral Resources (KIGAM))
  • Received : 2023.11.28
  • Accepted : 2024.02.24
  • Published : 2024.03.10
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Abstract

Underground openings significantly affect the mechanical stability of underground spaces and create damaged zones. This study investigated the acoustic emission (AE) characteristics associated with the formation of damaged zones around circular openings. Uniaxial compression experiments were conducted on three types of rock specimens, namely, granite (GN-1 and GN-2), gabbro (GB), and slate (SL), containing a circular opening. AE and digital image correlation (DIC) techniques were used to monitor and evaluate the damaged zones near the circular openings. The AE characteristics were evaluated using AE parameters, including count, energy, amplitude, average frequency, and RA value. The DIC results revealed that the estimated diameters of the damaged zones of GN-1, GN-2, GB, and SL were 1.66D, 1.53D, 1.49D, and 1.9D, respectively. The average displacements at the surface of the damaged zones for these specimens were 0.814, 0.786, 0.661, and 0.673 mm, respectively, thus demonstrating a strong correlation with Young's modulus. The AE analysis with DIC revealed that tensile failure occurred in the direction parallel to the maximum compression axis as the load increased. Thus, this study provides fundamental data for a comprehensive analysis of damaged zones in underground openings and will facilitate the optimization of rock engineering projects and safety assessments thereof.

Keywords

Acknowledgement

This work was supported by the Basic Research Project of the Korea Institute of Geoscience and Mineral Resources (KIGAM, GP2020-010) funded by the Ministry of Science and ICT, Institute for Korea Spent Nuclear Fuel (iKSNF), and Korea Foundation of Nuclear Safety (KOFONS) grant funded by the Korean government (Nuclear Safety and Security Commission, NSSC) [grant number RS-2021-KN066110]. This research was also conducted as part of the Brain Korea 21 FOUR Project at the Education & Research Center for the Infrastructure of the Smart Ocean City (i-SOC Center).

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