Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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A Study on the Estimation of Slope Stability under the Influence of the Vertical Direction Seismic Coefficient Using Lower Bound Analysis

하계해석을 이용한 수직방향 지진계수 영향에 따른 비탈면의 안정성 평가 연구

  • Choi, Sang-Ho (Infrastructure Safety Research Ins., Korea Infrastructure Safety Co.) ;
  • Kim, Jong-Min (Dept. of Construction & Environmental Engrg., Sejong Univ.) ;
  • Kim, Yong-Soo (Infrastructure Safety Research Ins., Korea Infrastructure Safety Co.)
  • 최상호 (한국시설안전공단 시설안전연구소) ;
  • 김종민 (세종대학교 건설환경공학과) ;
  • 김용수 (한국시설안전공단 시설안전연구소)
  • Received : 2012.11.14
  • Accepted : 2012.12.13
  • Published : 2012.12.31
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Abstract

Recent earthquake records indicate that the vertical component of earthquake loading, generally neglected in seismic slope stability analysis, has a significant influence on the stability. This is particularly true for the earthquakes originating inside the continent, not from its boundaries. Therefore the design of geotechnical structures without consideration of vertical component of earthquake loading may result in unsafe design. In this study, with a consideration of the effect of vertical seismic loading, the horizontal yield seismic coefficients under various slope conditions are estimated, using the lower bound limit analysis. In addition, the equation for the determination of the critical direction (either upward or downward) of vertical seismic loading is proposed.

최근에 발생한 아이티지진, 칠레지진의 지진파 기록에서 일반적으로 비탈면 안정해석에서 무시되었던 수직방향 지진가속도 성분이 크게 나타났다. 특히, 수직방향 지진성분은 진원이 내륙에 위치한 경우 더욱 뚜렷하게 나타난다. 그러므로 설계에 수직방향 지진성분을 고려하지 않은 지반 구조물들은 많은 인명과 재산 피해를 가져올 수 있다. 따라서, 본 연구는 지진계수비에 따른 수평방향 항복지진계수의 하계해를 산정하였고, 비탈면 안정성에 미치는 영향을 평가하였다. 또한, 한계상태 수직방향 지진계수의 방향(상향, 하향)을 결정할 수 있는 관계식을 제안하였다.

Keywords

References

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