터널과지하공간 (Tunnel and Underground Space)

  • 제24권3호
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  • Pages.187-200
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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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손상대를 고려한 암반사면 안정성 평가 및 인자분석

Assessment of Rock Slope Stability and Factor Analysis with a Consideration of a Damaged Zone

  • 김진수 (인하대학교 대학원 에너지자원공학과) ;
  • 권상기 (인하대학교 공과대학 에너지자원공학과) ;
  • 천대성 (한국지질자원연구원 지구환경본부 지하공간연구실) ;
  • 박의섭 (한국지질자원연구원 지구환경본부 지하공간연구실)
  • 투고 : 2014.04.18
  • 심사 : 2014.06.11
  • 발행 : 2014.06.30
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초록

굴착 또는 발파 후 암반손상대 내 암반 물성은 응력재분배나 발파충격에 의해 영구히 약화된다. 본 논문에서는 이러한 암반손상대를 사면에 적용하였다. 손상대 유 무에 따라 2차원 모델링을 통해 암반사면의 역학적 정성을 비교하고 안전율에 영향을 미치는 인자를 분석하는 것이 본 연구의 목적이다. 모델링 결과 사면의 역학적 안정성은 손상대 유 무에 따라 현저하게 차이가 있었다. 특히 손상대를 고려한 안전율은 고려하지 않을 때 보다 약 49.4%가 감소하였다. 부분요인설계법을 이용하여 안전율에 관한 인자 분석을 실시한 결과 안전율에 영향을 미치는 주요 인자는 사면 경사, 점착력, 내부마찰각, 높이였다.

After excavation or blasting, rock properties within an excavation damaged zone can be perpetually weakened on account of stress redistribution or blasting impact. In the present study, the excavation damaged zone is applied to a rock slope. The objective of this research is to compare the mechanical stability of the rock slope depending on the presence of the damaged zone using 2-dimensional modeling and analyze factors affecting factor-of-safety. From the modeling, it was founded that the mechanical stability of the rock slope is significantly dependent on the presence of the damaged zone. In particular, factor-of-safety with a consideration of the damaged zone decreased by approximately 49.4% in comparison with no damaged zone. Factor analysis by fractional factorial design was carried out on factor-of-safety. It showed that the key parameters affecting factor-of-safety are angle of the slope, cohesion, internal friction angle and height.

키워드

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