터널과지하공간 (Tunnel and Underground Space)

  • 제34권2호
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  • Pages.169-184
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  • 2024
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  • 1225-1275(pISSN)
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  • 2287-1748(eISSN)
한국암반공학회 (Korean Society for Rock Mechanics and Rock Engineering)
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이축압축실험을 통한 지하공동 손상시 음향방출 및 미소변형 특성 연구

A Study on Acoustic Emission and Micro Deformation Characteristics During Biaxial Compression Experiments of Underground Opening Damage

  • 김민준 (한국지질자원연구원 심층처분환경연구센터) ;
  • 최준형 (한국지질자원연구원 심층처분환경연구센터) ;
  • 나태유 (한국지질자원연구원 심층처분환경연구센터) ;
  • 박찬 (한국지질자원연구원 심층처분환경연구센터) ;
  • 채병곤 (한국지질자원연구원 심층처분환경연구센터) ;
  • 박의섭 (한국지질자원연구원 심층처분환경연구센터 )
  • Min-Jun Kim (Deep Subsurface Storage and Disposal Research Center, Korea Institute of Geoscience and Mineral Resources) ;
  • Junhyung Choi (Deep Subsurface Storage and Disposal Research Center, Korea Institute of Geoscience and Mineral Resources) ;
  • Taeyoo Na (Deep Subsurface Storage and Disposal Research Center, Korea Institute of Geoscience and Mineral Resources) ;
  • Chan Park (Deep Subsurface Storage and Disposal Research Center, Korea Institute of Geoscience and Mineral Resources) ;
  • Byung-Gon Chae (Deep Subsurface Storage and Disposal Research Center, Korea Institute of Geoscience and Mineral Resources) ;
  • Eui-Seob Park (Deep Subsurface Storage and Disposal Research Center, Korea Institute of Geoscience and Mineral Resources)
  • 투고 : 2024.04.18
  • 심사 : 2024.04.23
  • 발행 : 2024.04.30
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초록

본 연구에서는 심부 지하공간의 안정성을 평가하고자 심부 응력조건을 반영한 암석블록의 이축압축실험을 통하여 지하공동에서 손상 발생시 발생하는 음향방출 및 미소변형의 특성을 분석하였다. 음향방출 특성 분석 결과 지하공동에서 손상 발생 직전에 음향방출 신호의 주파수, 카운트, 에너지, 진폭 특성이 급격히 증가하였다. 특히 주파수와 카운트는 손상 전후에서 특성 차이가 크게 나타나 원형 공동의 손상 특성 분석에 적합한 음향방출 인자인 것으로 나타났다. 이미지상관기법 적용결과 실험 중 공동 주변에 변형이 집중되었음을 변형률의 공간적 분포를 통해 알 수 있었으며, 실험 종료 지점에서는 스폴링 현상이 발생하였음을 확인할 수 있었다. 본 연구에서 제시된 원형 공동 손상시 음향방출 및 미소변형 특성은 심지층 활용을 위한 지하공동 안정성 평가의 기초자료로 활용될 것으로 기대된다.

This study investigates acoustic emission (AE) and micro-deformation characteristics of circular openings through biaxial compression experiments. The experimental results showed a significant increase in the frequency, count, energy, and amplitude of AE signals immediately before damage occurred in the circular opening. The differences in frequency and count between before and after damage initiation were significantly pronounced, indicating suitable factors for identifying damage occurrence in circular openings. The results for digital image correlation (DIC) technique revealed that micro-deformation was concentrated around the openings, as evidenced by the spatial distribution of strain. In addition, spalling was observed at the end of the experiments. The AE and micro-deformation characteristics presented in this study are expected to serve as fundamental data for evaluating the stability of underground openings and boreholes for deep subsurface projects.

키워드

과제정보

본 연구는 한국지질자원연구원의 기본사업인 '심지층 개발과 활용을 위한 지하심부 특성평가 기술개발(과제코드 GP2020-010)' 및 2024년도 정부(원자력안전위원회)의 재원으로 사용후핵연료관리핵심기술개발사업단 및 한국원자력안전재단(RS-2021-KN066110)의 지원을 받았습니다.

참고문헌

  1. AEwin, 2014, Software Users' Manual, MISTRAS Group Inc., Benicia, CA, USA.
  2. Aliabadian, Z., Zhao, G.F., and Russell, A.R., 2019, Failure, crack initiation and the tensile strength of transversely isotropic rock using the Brazilian test, International Journal of Rock Mechanics and Mining Sciences, 122, 104073.
  3. Cao, A., Jing, G., Ding, Y.L., and Liu, S., 2019, Mining-induced static and dynamic loading rate effect on rock damage and acoustic emission characteristic under uniaxial compression, Safety Science, 116, 86-96. https://doi.org/10.1016/j.ssci.2019.03.003
  4. Chu, C., Wu, S., Zhang, C., and Zhang, Y., 2023, Microscopic damage evolution of anisotropic rocks under indirect tensile conditions: Insights from acoustic emission and digital image correlation techniques, International Journal of Minerals, Metallurgy and Materials, 30(9), 1680.
  5. Dantec Dynamics GmbH, 2016, ISTRA 4D Software Manual Q-400 System, Nova Instruments, Germany
  6. Fakhimi, A., Carvalho, F., Ishida, T., and Labuz, J.F., 2002, Simulation of failure around a circular opening in rock, International Journal of Rock Mechanics and Mining Sciences, 39(4), 507-515. https://doi.org/10.1016/S1365-1609(02)00041-2
  7. Gong, Y., Song, Z., He, M., Gong, W., and Ren, F., 2017, Precursory waves and eigenfrequencies identified from acoustic emission data based on singular spectrum analysis and laboratory rock-burst experiments, International Journal of Rock Mechanics and Mining Sciences, 91, 155-169. https://doi.org/10.1016/j.ijrmms.2016.11.020
  8. Grosse, C. and Ohtsu, M., 2008, Acoustic Emission Testing: Basics for Research-Applications in Civil Engineering, Springer: Berlin/Heidelberg, Germany.
  9. Hardy, H.R., 1981, Applications of acoustic emission techniques to rock and rock structures: A state-of-the-art review. Acoustic emissions in geotechnical engineering practice, American Society for Testing Materials, 4-92.
  10. Hong, S., Kwon, S., Min, K. B., and Ji, S.H., 2021, Effect of Excavation and Thermal Stress on Slip Zone and Aperture Change Around Disposal Hole and Tunnel in Fractured Rock, Tunnel and Underground Space, 31(2), 125-144. https://doi.org/10.7474/TUS.2021.31.2.125
  11. Kang, I.S. and Song, J.J., 2019, Fast Analysis of Rock Block Behavior on Underground Opening considering Geostatic Stress Conditions, Tunnel and Underground Space, 29(1), 64-74. https://doi.org/10.7474/TUS.2019.29.1.064
  12. Kim, J.S., Hong, C.H., and Kim, G.Y., 2020, Evaluation of Stress Thresholds in Crack Development and Corrected Fracture Toughness of KURT Granite under Dry and Saturated Conditions, Tunnel and Underground Space, 30(3), 256-269. https://doi.org/10.7474/TUS.2020.30.3.256
  13. Lee, J.W., Kim, H., and Oh, T.M., 2020, Acoustic Emission Characteristics during Uniaxial Compressive Loading for Concrete Specimens according to Sand Content Ratio, KSCE Journal of Civil Engineering, 24(9), 2808-2823. https://doi.org/10.1007/s12205-020-5697-0
  14. Lee, J.W., Oh, T.M., Kim, H., Kim, M.J., and Song, K.I., 2019, Analysis of acoustic emission parameters according to failure of rock specimens, Journal of Korean Tunnelling and Underground Space Association. 30, 657-673.
  15. Li, L.R., Deng, J.H., Zheng, L., and Liu, J.F., 2017, Dominant frequency characteristics of acoustic emissions in white marble during direct tensile tests, Rock Mechanics and Rock Engineering, 50(5), 1337-1346. https://doi.org/10.1007/s00603-016-1162-2
  16. Lin, Q. and Labuz, J.F., 2013, Fracture of sandstone characterized by digital image correlation, International Journal of Rock Mechanics and Mining Sciences, 60, 235-245. https://doi.org/10.1016/j.ijrmms.2012.12.043
  17. Miao, S., Pan, P.Z., Konicek, P., Yu, P., and Liu, K., 2021, Rock damage and fracturing induced by high static stress and slightly dynamic disturbance with acoustic emission and digital image correlation techniques, Journal of Rock Mechanics and Geotechnical Engineering, 13(5), 1002-1019. https://doi.org/10.1016/j.jrmge.2021.05.001
  18. Miao, S., Pan, P.Z., Zhao, X., Shao, C., and Yu, P., 2020, Experimental Study on Damage and Fracture Characteristics of Beishan Granite Subjected to High-temperature Treatment with DIC and AE Techniques, Rock Mechanics and Rock Engineering, 54, 721-743. https://doi.org/10.1007/s00603-020-02271-4
  19. Moradian, Z., Einstein, H.H., and Ballivy, G., 2016, Detection of cracking levels in brittle rocks by parametric analysis of the acoustic emission signals, Rock Mechanics and Rock Engineering, 49, 785-800. https://doi.org/10.1007/s00603-015-0775-1
  20. Oh, T.M., Kim, M.K., Lee, J.W., Kim, H., and Kim, M.J., 2020, Experimental investigation on effective distances of acoustic emission in concrete structures, Applied Sciences, 10(17), 6051.
  21. Park, Y.J. and Kim, K.H., 2006, Analytical solution for a circular opening in an elastic-brittle-plastic rock, International Journal of Rock Mechanics and Mining Sciences, 43(4), 616-622. https://doi.org/10.1016/j.ijrmms.2005.11.004
  22. Stirling, R.A., Simpson, D.J., and Davie, C.T., 2013, The application of digital image correlation to Brazilian testing of sandstone, International Journal of Rock Mechanics and Mining Sciences, 60, 1-11. https://doi.org/10.1016/j.ijrmms.2012.12.026
  23. Wu, H., Ma, D., Spearing, A.J.S., and Zhao, G. 2021, Fracture response and mechanisms of brittle rock with different numbers of openings under uniaxial loading, Geomechanics and Engineering, 25(6), 481-493. https://doi.org/10.12989/GAE.2021.25.6.481
  24. Xin, C., Yang, Y., Yang, M., Liang, P., Sun, Y., and Shen, H., 2022, Study on Strain Field Evolution of Uniaxial Compression Sandstone Based on Digital Image Correlation Technology, Applied Sciences, 12(23), 11939.