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A study on conceptual evaluation of structural stability of room-and-pillar underground space

주방식 지하공간의 구조적 안정성 평가개념 정립에 관한 연구

  • Lee, Chulho (Geotechnical Engineering Research Division, SOC Research Institute, Korea Institute of Construction Technology) ;
  • Chang, Soo-Ho (Geotechnical Engineering Research Division, SOC Research Institute, Korea Institute of Construction Technology) ;
  • Shin, Hyu-Soung (Geotechnical Engineering Research Division, SOC Research Institute, Korea Institute of Construction Technology)
  • 이철호 (한국건설기술연구원 SOC성능연구소 Geo-인프라연구실) ;
  • 장수호 (한국건설기술연구원 SOC성능연구소 Geo-인프라연구실) ;
  • 신휴성 (한국건설기술연구원 SOC성능연구소 Geo-인프라연구실)
  • Received : 2013.11.01
  • Accepted : 2013.11.08
  • Published : 2013.11.30

Abstract

In this study, in order to evaluate stability of the room-and-pillar underground structure, a series of preliminary numerical analyses were performed. Design concept and procedure of an underground structure for obtaining a space are proposed, which should be different from structural design for the room-and-pillar in mine. With assumed material properties, a series of numerical analyses were performed by varying size ratios of room and pillar and then the failure modes and location at yielding initiation were investigated. From the results, relationship between the ratio of pillar width to the roof span (w/s) and overburden pressure at failure initiation shows a relatively linear relation, and the effect of w/s on structural stability is much more critical than the ratio of pillar width and height (w/H) which is a crucial parameter in design of the room-and-pillar mining. It means that roof tensile failure and shear failure at shoulder and pillar are necessary to be considered together for confirming overall structural stability of the room-and-pillar structure, rather than considering the pillar stability only in mining. Failure modes and location at failure initiation were varied with respect to the ratio of room and pillar widths. Therefore, it is necessary to simultaneously consider stability of both roof span and pillar for design of underground structure by the room-and-pillar method.

Acknowledgement

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

Supported by : 한국건설기술연구원

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