Journal of the Earthquake Engineering Society of Korea (한국지진공학회논문집)

Earthquake Engineering Society of Korea (한국지진공학회)
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Application into Assessment of Liquefaction Hazard and Geotechnical Vulnerability During Earthquake with High-Precision Spatial-Ground Model for a City Development Area

도시개발 영역 고정밀 공간지반모델의 지진 시 액상화 재해 및 지반 취약성 평가 활용

  • Kim, Han-Saem (Earthquake Research Center, Korea Institute of Geoscience and Mineral Resources) ;
  • Sun, Chang-Guk (Earthquake Research Center, Korea Institute of Geoscience and Mineral Resources) ;
  • Ha, Ik-Soo (Department of Civil Engineering, Kyungnam University)
  • 김한샘 (한국지질자원연구원 지진연구센터) ;
  • 선창국 (한국지질자원연구원 지진연구센터) ;
  • 하익수 (경남대학교 재난안전건설학과)
  • Received : 2023.08.02
  • Accepted : 2023.08.11
  • Published : 2023.09.01
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Abstract

This study proposes a methodology for assessing seismic liquefaction hazard by implementing high-resolution three-dimensional (3D) ground models with high-density/high-precision site investigation data acquired in an area of interest, which would be linked to geotechnical numerical analysis tools. It is possible to estimate the vulnerability of earthquake-induced geotechnical phenomena (ground motion amplification, liquefaction, landslide, etc.) and their triggering complex disasters across an area for urban development with several stages of high-density datasets. In this study, the spatial-ground models for city development were built with a 3D high-precision grid of 5 m × 5 m × 1 m by applying geostatistic methods. Finally, after comparing each prediction error, the geotechnical model from the Gaussian sequential simulation is selected to assess earthquake-induced geotechnical hazards. In particular, with seven independent input earthquake motions, liquefaction analysis with finite element analyses and hazard mappings with LPI and LSN are performed reliably based on the spatial geotechnical models in the study area. Furthermore, various phenomena and parameters, including settlement in the city planning area, are assessed in terms of geotechnical vulnerability also based on the high-resolution spatial-ground modeling. This case study on the high-precision 3D ground model-based zonations in the area of interest verifies the usefulness in assessing spatially earthquake-induced hazards and geotechnical vulnerability and their decision-making support.

Keywords

Acknowledgement

본 연구는 한국지질자원연구원 주요사업인 '동남권 단층지진원 기반 강지진동 예측 및 지역특화 지진조기경보 기술개발' 과제의 일환으로 수행되었습니다.

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