Tunnel and Underground Space (터널과지하공간)

Korean Society for Rock Mechanics and Rock Engineering (한국암반공학회)
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An Assessment of Rock Pillar Behavior in Very Near Parallel Tunnel

초근접 병설터널의 암반 필라 거동 평가

  • 김원범 (전남대학교 에너지자원공학과) ;
  • 양형식 (전남대학교 에너지자원공학과) ;
  • 하태욱 (하경엔지니어링 터널지반부)
  • Received : 2012.02.15
  • Accepted : 2012.02.24
  • Published : 2012.02.29
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Abstract

Focusing on the load tunnel, this study assessed the behavior of rock pillars with less than 0.5D of the minimized distance between the two horizontal tunnels by using a three dimensional numerical analysis. Based on a parameter affecting the behavior of rock pillars, this study evaluated different safety factors according to pillar width, depth and rock conditions. It turned out that as the pillar width increases, the current curve of safety factors in accordance with depth and rock conditions shows more of the nonlinear behavior. Judging from the minimum safety factor, the study suggested a design chart, working on the minimized distance between the two horizontal tunnels.

본 연구에서는 도로터널을 대상으로 최소 이격거리가 0.5D 이하인 근접 병설터널의 암반 필라 거동을 3차원 수치해석방법으로 검토하였다. 암반 필라의 거동에 영향을 미치는 매개변수로 이격거리와 심도(토피고) 및 암반조건의 변화에 따른 안전율을 평가하였다. 이격거리가 증가할수록 토피고와 암반조건에 따른 안전율 추세곡선은 비선형 거동을 보여 주었으며, 최소 안전율을 기준으로 최소 이격거리를 산정하여 설계도표를 제시하였다.

Keywords

References

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