The Journal of Engineering Geology (지질공학)

The Korean Society of Engineering Geology (대한지질공학회)
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Development of Improved Rock Bolt for Reinforcement of Fracture Zone in Slope and Tunnel

사면 및 터널에서의 암반 파쇄대 보강을 위한 개량형 록볼트 개발

  • Kim, Soo-Lo (Institute of Mine Reclamation Technology, Mine Reclamation Corporation) ;
  • Kim, Jong-Tae (Dept. of Earth and Environmental Sciences, Andong National University) ;
  • Park, Seong-Cheol (Dept. of Earth and Environmental Sciences, Andong National University) ;
  • Kim, Tae-Heok (Institute of Mine Reclamation Technology, Mine Reclamation Corporation) ;
  • Kwon, Hyun-Ho (Institute of Mine Reclamation Technology, Mine Reclamation Corporation) ;
  • Jeong, Gyo-Cheol (Dept. of Earth and Environmental Sciences, Andong National University)
  • 김수로 (한국광해관리공단 광해기술연구소) ;
  • 김종태 (안동대학교 지구환경과학과) ;
  • 박성철 (안동대학교 지구환경과학과) ;
  • 김태혁 (한국광해관리공단 광해기술연구소) ;
  • 권현호 (한국광해관리공단 광해기술연구소) ;
  • 정교철 (안동대학교 지구환경과학과)
  • Received : 2009.12.21
  • Accepted : 2010.03.29
  • Published : 2010.03.31
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Abstract

There are many slopes generally developed by excavation and cut slope with small steps on massive slopes of roads. Especially these cut slopes which excavating around fault fracture zone need a reinforcement technology in order to ensure safety. In the case of slope excavation, it is difficult to use the existing slope support at fracture zone because of geological characteristics. Especially the factor of safety decreases significantly due to the movement of blocks in bed rocks and the expansion of interspace of discontinuous planes in fractured zones caused by excavation. Thus an efficient reinforcement technique in accordance with geological properties of fracture zones needs to be developed because the existing slope support has a restricted application. Therefore it is necessary to develop the specialized rock bolt technique in order to ensure an efficient factor of safety for anomalous fracture zones in slopes and tunnels. The purpose of this study is to develop newly improved rock bolt to increase a supporting effect of the swellex bolt method used recently as a friction type in fracture zones.

대규모 도로사면의 경우 대부분 소단 형식의 계단식 절개사면인 경우가 많다. 특히 단층파쇄대와 동반된 절개사면은 안정성 확보를 위해 특별한 보강공법이 요구된다. 이러한 특이 사면에서의 경우는 지질적 특성 때문에 기존 사면 보강공법으로는 어려운 경우가 많다. 특히 파쇄대 발달 구간에서는 굴착과 발파로 인해 암반 내 블록의 움직임 및 불연속면의 간극이 확대되어 사면의 안전율이 크게 낮아진다. 이로 인해 파쇄대의 지질적 특성에 따른 효율적인 보강대책공법 개발이 필요하나 현재까지의 지보재로는 그 적용성에 한계가 있다. 따라서 사면 및 터널 내 특이 파쇄대 구간의 효율적인 안정성 확보를 위해 특화된 록볼트 공법 개발이 필요하다. 본 연구에서는 이를 위해 최근 특이 암반파쇄대 구간에서 전면 마찰형으로 사용되는 스웰렉스 볼트 공법의 지보효과를 증대시키는 새로운 개량형 록볼트를 개발하는데 목적을 두고 있다.

Keywords

References

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