터널과지하공간 (Tunnel and Underground Space)

  • 제24권5호
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  • Pages.335-343
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  • 2014
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  • 1225-1275(pISSN)
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  • 2287-1748(eISSN)
한국암반공학회 (Korean Society for Rock Mechanics and Rock Engineering)
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지류론과 암주 강도의 추정에 의한 주방식 지하구조의 무지보 암주 설계

Design of Unsupported Rock Pillars in a Room-and-Pillar Underground Structure by the Tributary Area Method and the Pillar Strength Estimation

  • 장수호 (한국건설기술연구원 GEO-인프라 연구실) ;
  • 이철호 (한국건설기술연구원 GEO-인프라 연구실) ;
  • 최순욱 (한국건설기술연구원 GEO-인프라 연구실) ;
  • 허진석 ((주)에스코컨설턴트) ;
  • 황제돈 ((주)에스코컨설턴트)
  • 투고 : 2014.10.01
  • 심사 : 2014.10.17
  • 발행 : 2014.10.31
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초록

무지보 암주에 의해 채굴적의 안정성을 확보하는 주방식 채광법은 전 세계적으로 가장 일반적이며 널리 활용되고 있는 지하 채광법이다. 경제적이고 운용 중에 확장이 가능한 주방식 채광법을 지하공간 건설에 적용하기 위한 기초 연구로서, 본 연구에서는 주방식 지하구조에서 가장 중요한 무지보 암주의 설계방법을 고찰하고 주요 설계변수들에 대한 총 125개 조건의 변수해석을 실시하였다. 이상의 연구결과, 암주의 폭과 암주의 안전율은 매우 뚜렷한 선형관계를 보이며, 암석의 압축강도가 동일할 경우에는 공간 폭과 암주 폭의 비율이 증가할수록 무지보 암주의 안전율이 음지수 함수 형태로 감소하는 것으로 나타났다. 또한 변수해석 결과들을 바탕으로, 암석의 압축강도와 설계 안전율에 따라 무지보 암주의 설계 형상변수를 쉽게 추정할 수 있는 도표를 제시하였다.

Room-and-pillar mining method is one of the most popular underground mining method in the world. If the room-and-pillar mining method is able to be adopted in civil works, it would be highly probable to reduce underground construction costs and to expand a underground structure in use. Therefore, this study aims to analyze the design procedure of unsupported rock pillars which are indispensable to ensure the stability of a room-and-pillar underground structure. Parametric studies on their key design parameters are also carried out for 125 different kinds of design conditions. From the study, the width of a rock pillar is found to show a linear relationship with its corresponding safety factor. The safety factor of a unsupported rock pillar decreased drastically like a negative exponential function as the ratio of room width to pillar width increases in the same rock strength condition. Based on the parametric studies, a design chart to simply evaluate the geometric design parameters of a unsupported rock pillar satisfying a design safety factor is also proposed in this study.

키워드

참고문헌

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