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2024 Vol.34, Issue 2 Preview Page

Original Article

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

이축압축실험을 통한 지하공동 손상시 음향방출 및 미소변형 특성 연구

Min-Jun Kim1
,
Junhyung Choi2
,
Taeyoo Na3
,
Chan Park4
,
Byung-Gon Chae4
,
Eui-Seob Park5*
김 민준1
,
최 준형2
,
나 태유3
,
박 찬4
,
채 병곤4
,
박 의섭5*
1Senior Researcher, Deep Subsurface Storage and Disposal Research Center, Korea Institute of Geoscience and Mineral Resources
2Senior Engineer, Deep Subsurface Storage and Disposal Research Center, Korea Institute of Geoscience and Mineral Resources
3Postdoctoral Researcher, Deep Subsurface Storage and Disposal Research Center, Korea Institute of Geoscience and Mineral Resources
4Principal Researcher, Deep Subsurface Storage and Disposal Research Center, Korea Institute of Geoscience and Mineral Resources
5Head, Deep Subsurface Storage and Disposal Research Center, Korea Institute of Geoscience and Mineral Resources
1한국지질자원연구원 심층처분환경연구센터 선임연구원
2한국지질자원연구원 심층처분환경연구센터 선임기술원
3한국지질자원연구원 심층처분환경연구센터 박사후연수자
4한국지질자원연구원 심층처분환경연구센터 책임연구원
5한국지질자원연구원 심층처분환경연구센터 센터장
*Corresponding Author
30 April 2024. pp. 169-184
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Abstract

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.

Keywords
Underground opening
Biaxial compression experiment
Acoustic emission
Digital image correlation

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.

키워드
지하공동
이축압축실험
음향방출
이미지상관기법
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Information
  • Publisher :Korean Society for Rock Mechanics and Rock Engineering
  • Publisher(Ko) :한국암반공학회
  • Journal Title :Tunnel and Underground Space
  • Journal Title(Ko) :터널과 지하공간
  • Volume : 34
  • No :2
  • Pages :169-184
  • Received Date : 2024-04-18
  • Revised Date : 2024-04-22
  • Accepted Date : 2024-04-23
  • DOI :https://doi.org/10.7474/TUS.2024.34.2.169
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