Tunnel and Underground Space (터널과지하공간)

Korean Society for Rock Mechanics and Rock Engineering (한국암반공학회)
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Evaluation of Traffic Vibration Effect for Utilization of Abandoned Mine Openings

휴·폐광산 채굴 공동 활용을 위한 교통 진동 영향 평가

  • Hyeon-Woo Lee (Depart. of Integrated Energy and Infra System, Kangwon National University) ;
  • Seung-Joong Lee (Smart Mining Team, Hanwha/Global Corporation) ;
  • Sung-Oong Choi (Depart. of Energy and Resources Engineering, Kangwon National University)
  • 이현우 (강원대학교 에너지인프라융합학과) ;
  • 이승중 ((주)한화/글로벌 스마트마이닝팀) ;
  • 최성웅 (강원대학교 에너지자원.산업공학부 에너지자원공학전공)
  • Received : 2023.04.10
  • Accepted : 2023.04.24
  • Published : 2023.04.30
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Abstract

In this study, the effect of repeated traffic vibration on the long-term stability of mine openings is analyzed for re-utilization of abandoned mine galleries. The research mine in this study is an underground limestone mine which is developed by room-and-pillar mining method, and a dynamic numerical analysis is performed assuming that the research mine will be utilized as a logistics warehouse. The actual traffic vibration generated by the mining vehicles is measured directly, and its waveform is used as input data for dynamic numerical analysis, As a results of dynamic numerical analysis, after 20,000 repetitions of traffic vibration, the mine openings is analyzed to be stable, but an increase in the maximum principal stress and an additional area of plastic zone are observed in the analysis section. As shown in the changes of displacement, volumetric strain, and maximum principal stress which are measured at the mine opening walls. It is confirmed that if the repeated traffic vibration is continuously applied, the instability of the mine openings can be increased. Authors expect that the results of this study can be used as a reference for basic study on utilization of abandoned mine.

본 연구에서는 휴·폐광산 채굴 공동을 다른 목적으로 사용코자 할 경우, 특히 갱도 내에서 발생하는 반복 교통 진동이 채굴 공동의 장기적인 안정성에 미치는 영향을 분석하였다. 연구 대상 광산은 주방식 채광법이 적용된 지하 석회석 광산이며, 해당 광산이 물류 창고로 활용되는 상황을 가정하여 동적 수치해석을 수행하였다. 특히 해당 광산에서 광산차량의 운행으로 실제 발생하는 교통진동을 직접 측정하여 이를 진동파형 형태로 동적수치해석용 입력자료로 반영하였다. 20,000회의 교통 진동이 반복된 상황을 고려한 동적수치해석 이후, 채굴 공동은 안정적인 것으로 분석되었지만, 해석 단면 전체에 걸쳐 최대주응력의 증가와 탄소성 거동 영역의 추가 발생이 확인되었다. 또한 채굴 공동 벽면의 변위와 체적 변형률, 최대주응력의 변화 양상에서 반복 교통 진동이 지속될 경우, 공동 주변의 응력 변화로 인해 공동의 불안정성이 증대될 수 있음을 확인하였다. 채굴 공동에 작용하는 교통 진동의 영향을 분석한 국내 연구 사례가 부족한 상황에서 본 연구는 국내 휴·폐광산 활용을 위한 기초연구자료로 활용될 것을 기대한다.

Keywords

Acknowledgement

본 연구는 2023년도 정부(산업통상자원부)의 재원으로 해외자원개발협회의 지원(2021060003, 스마트 마이닝 전문 인력 양성)과 2023년도 정부(과학기술정보통신부, 환경부, 산업통상자원부)의 재원으로 한국연구재단-탄소자원화 국가전략프로젝트사업(NRF-2017M3D8A2085342)의 지원으로 수행되었습니다.

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