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A numerical study on evaluation of unsupported pillar strength in the room and pillar method

주방식 공법에서 무지보 암주의 강도 산정에 관한 수치해석적 연구

  • Lee, Chulho (Geotechnical Engineering Research Division, Korea Institute of Construction Technology) ;
  • Chang, Soo-Ho (Geotechnical Engineering Research Division, Korea Institute of Construction Technology) ;
  • Shin, Hyu-Soung (Geotechnical Engineering Research Division, Korea Institute of Construction Technology)
  • 이철호 (한국건설기술연구원 SOC성능연구소 Geo-인프라연구실) ;
  • 장수호 (한국건설기술연구원 SOC성능연구소 Geo-인프라연구실) ;
  • 신휴성 (한국건설기술연구원 SOC성능연구소 Geo-인프라연구실)
  • Received : 2013.07.15
  • Accepted : 2013.07.28
  • Published : 2013.07.31

Abstract

This study aims to evaluate the mechanical behaviors of unsupported rock pillars in a room-and-pillar underground structure by a series of numerical analyses. In addition, rock pillar strengths estimated by a few empirical equations proposed for underground mines are compared with those from numerical analyses. Based on the results from the numerical analysis, the ratio of pillar strength to rock mass strength increases as the ratio of the width of a pillar to its height becomes bigger. It means that higher ratio of pillar width to its height is much more favorable for stabilizing a room-and-pillar underground structure. Especially, unsupported pillar strengths estimated from numerical analyses are higher than rock mass strength when the ratio of pillar width to height is approximately over 1.5. It is also found that the choice of an empirical equation appropriate for a given geometric condition of a pillar is important for its feasible application to the stability analysis of a pillar in the room-and-pillar method.

Acknowledgement

Grant : 운용 중 공간확장이 가능한 지하 굴착 및 안정화 기술 개발

Supported by : 한국건설기술연구원

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