Evaluating the Stability of Large-scale Gangways Mined in a Limestone Mine Using Rock Classification Schemes

암반분류법을 이용한 석회석 광산 내 대규격 갱도의 안정성 평가

  • 윤용균 (세명대학교 자원환경공학과) ;
  • 이홍우 (세명대학교 대학원 환경안전시스템공학과)
  • Published : 2007.12.31

Abstract

Rock classification schemes such as RMR, Q-system were applied to investigate the stability of large-scale gangways mined in a limestone mine. 22 areas for engineering geological surveys were selected and rock classifications at each survey point had been carried out. Considering the fact that the observed gangways have not experienced some severe failure and have been stably maintained till now, it is found that Q-system is more reasonable than RMR in evaluating the stability of unsupported span. Also, extended Mathews stability graph method which is a kind of revised Q-system was used to assess the stability of gangways and the results represent that all gangways except for one area are under stable condition. Based on above the mentioned results, the empirical equations to design the maximum unsupported span and critical height of a large-scale gangway are suggested.

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