Tunnel and Underground Space (터널과지하공간)

Korean Society for Rock Mechanics and Rock Engineering (한국암반공학회)
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A Study on the Model Test for Pneumatic Mine-Filling

공압식 갱내충전을 위한 모형실험 연구

  • Yang, In-Jae (Dept. of Energy & mineral Resources Engineering, Kangwon National University) ;
  • Shin, Dong-Choon (Dept. of Energy & mineral Resources Engineering, Kangwon National University) ;
  • Yoon, Byung-Sik (Dept. of Energy & mineral Resources Engineering, Kangwon National University) ;
  • Mok, Jin-Ho (Dept. of Energy & mineral Resources Engineering, Kangwon National University) ;
  • Kim, Hak-Sung (Dept. of Energy & mineral Resources Engineering, Kangwon National University) ;
  • Lee, Sang-Eun (Dept. of Energy & mineral Resources Engineering, Kangwon National University)
  • Received : 2014.12.05
  • Accepted : 2014.12.23
  • Published : 2014.12.31
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Abstract

There are many case studies and application cases in abandoned mines for hydraulic filling method filled by slurry or paste form, but research on the pneumatic filling is not applied in Korea. The damage of steel pipe is occurred by wear due to the flow of filling material in the bent area of steel pipe in traditional pneumatic filling method. In this study, the new pneumatic filling method was developed using a newly devised improved nozzle to improve the above problem. The model test for mine filling was performed in the laboratory for the simulated accessible or inaccessible mine cavities, and the filling efficiency by the results obtained from the test was calculated. The filling efficiency was analyzed from the variation of outlet angle, feed rate and grain size of sand in model test of simulated accessible mine cavity. The superiority of improved pneumatic filling method was proved through the analysis of filling efficiency by the results obtained from each model tests of gravitational, traditional, and improved filling method in simulated inaccessible mine cavity.

국내의 경우 슬러리나 페이스트 형태로 수압식 충전에 대한 연구와 다양한 폐광산 현장에 적용한 사례는 많으나, 공압식 충전에 대한 연구는 진행되지 않고 있다. 기존의 공압식 충전법은 강관의 구부러진 곳에서 충전재 유동에 의한 마모에 의해 강관의 손상이 발생한다. 이와 같은 문제점을 개선하기 위하여 새로 고안한 개량형 노즐을 이용한 공압식 충전법을 개발하였다. 본 연구에서는 접근이 가능하거나 불가능한 채굴공동을 모사하여 실험실에서 모형실험을 수행하고 그 충전효율을 평가하였다. 갱내 충전법 실험에서는 토출각의 변화, 모래의 투입량 및 입자 크기에 따라 충전효율을 분석하였으며, 지상 충전법 실험에서는 중력식, 재래식 및 개량형 충전방법의 실험으로부터 충전효율을 분석하여 개량형 공압식 충전법의 우수성을 입증하였다.

Keywords

References

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  1. Research and Development Trends for Mine Subsidence Prevention Technology in Korea vol.25, pp.5, 2015, https://doi.org/10.7474/TUS.2015.25.5.408