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Research Paper

Evaluation Study on the Support Effect of Sprayed Concrete by Excavation Monitoring of Mine drift

광산갱도 계측을 통한 굴착에 따른 스프레이 콘크리트의 갱도 보강효과 평가

Dong-Min Kim1
,
Sang-Joon Ma1*
김 동민1
,
마 상준1*
1한국건설기술연구원 Geo-인프라연구실
*Corresponding Author. 
31 December 2013. pp. 862-874
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Abstract

In this study, the convergence and the stress of sprayed concrete were measured in process of excavation of mine drift and it was evaluated that the stability of unsupported and supported mine drift. In result of the prediction of final displacement, the displacement of unsupported mine drift was somewhat larger than that of supported mine and sprayed concrete stress was early stabilized in supported mine. The critical strain of crown displacement in unsupported mine drift was located in Caution Level I, so it was judged that the relaxation zone was locally appeared in ground and some caution was required in process of excavation. In result of the computation of apparent young's modulus, that increased by the effect of sprayed concrete supporting and sprayed concrete supporting was highly efficient by more than 50% comparing with unsupported mine drift.

Keywords
Mine drift
Excavation monitoring
Sprayed concrete
Critical strain
Apparent young's modulus

본 연구에서는 광산갱도에서 굴착에 따른 변위 및 스프레이 콘크리트의 응력을 계측하고, 무지보 및 보강갱도에서의 안정성을 평가하였다. 갱도의 최종변위량 예측결과 무지보 갱도가 스프레이 콘크리트 보강갱도에 비해 전반적인 변위가 다소 크게 나타났으며, 스프레이 콘크리트 보강갱도의 경우 강도가 발현됨에 따라 갱도가 빨리 안정화되는 것으로 나타났다. 무지보 갱도의 한계변형률은 천단변위의 경우 주의레벨Ⅰ로 국부적으로 지반의 이완영역이 발생하여 굴착시 약간의 주의가 필요할 것으로 판단되었다. 갱도의 겉보기 탄성계수 산정결과 스프레이 콘크리트의 지보효과에 의해 겉보기 탄성계수가 증가하는 효과를 확인할 수 있었고, 무지보 갱도에 비해 약 50% 이상 갱도 보강 효율이 높은 것으로 평가되었다.

키워드
광산갱도
굴착 계측
스프레이 콘크리트
한계변형률
겉보기 탄성계수
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Information
  • Publisher :The Korean Society of Mineral and Energy Resources Engineers
  • Publisher(Ko) :한국자원공학회
  • Journal Title :Journal of the Korean Society of Mineral and Energy Resources Engineers
  • Journal Title(Ko) :한국자원공학회지
  • Volume : 50
  • No :6
  • Pages :862-874
  • Received Date : 2013-08-09
  • Revised Date : 2013-12-06
  • Accepted Date : 2013-12-12
  • DOI :https://doi.org/10.12972/ksmer.2013.50.6.862
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