Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Development of Multi-hazard Fragility Surface for Liquefaction of Levee Considering Earthquake Magnitude and Water Level

수위와 지진을 고려한 제방의 액상화에 대한 복합재해 취약도 곡면 작성

  • Hwang, Ji-Min (Dept. of Civil, Safety, and Environmental Engrg., Hankyong National Univ.) ;
  • Cho, Sung-Eun (Dept. of Civil, Safety, and Environmental Engrg. & Construction Engrg. Research Institute, Hankyong National Univ.)
  • 황지민 (한경대학교 토목안전환경공학과) ;
  • 조성은 (한경대학교 토목안전환경공학과)
  • Received : 2018.04.03
  • Accepted : 2018.05.31
  • Published : 2018.06.30
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Abstract

Soil liquefaction is one of the types of major seismic damage. Soil liquefaction is a phenomenon that can cause enormous human and economic damages, and it must be examined before designing geotechnical structures. In this study, we proposed a practical method of developing a multi-hazard fragility surface for liquefaction of levee considering earthquake magnitude and water level. Limit state for liquefaction of levee was defined by liquefaction potential index (LPI), which is frequently used to assess the liquefaction susceptibility of soils. In order to consider the uncertainty of soil properties, Monte Carlo Simulation based probabilistic analysis was performed. Based on the analysis results, a 3D fragility surface representing the probability of failure by soil liquefaction as a function of the ground motion and water level has been established. The prepared multi-hazard fragility surface can be used to evaluate the safety of levees against liquefaction and to assess the risk in earthquake and flood prone areas.

지반의 액상화는 지진 피해의 대표적인 형태 중 하나이다. 이는 막대한 인적 경제적 피해를 줄 수 있는 현상으로, 지반구조물의 설계 전 필수적으로 검토해야 하는 대상이다. 본 연구에서는 하천 제방을 대상으로 임의의 지진 규모와 수위에서 액상화에 대한 실용적인 복합재해 취약도 곡면 작성법을 제시하였다. 지반의 파괴 정도를 나타내는 액상화 가능 지수(LPI)로 제방의 액상화에 대한 한계상태를 정의하였다. 지반 물성치의 불확실성을 고려하기 위해 Monte Carlo Simulation 기반의 확률론적 해석을 수행하였고, 해석 결과를 바탕으로 임의 수준의 수위와 지진 규모에 대하여 액상화에 의한 파괴확률을 나타내는 3차원의 취약도 곡면을 작성하였다. 작성된 복합재해 취약도 곡면은 홍수 및 지진에 대한 제방의 안전성 평가와 취약지역에 대한 위험도 평가에 사용될 수 있다.

Keywords

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