Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Application and Verification of Liquefaction Potential Index in Liquefaction Potential Assessment of Korean Port and Harbor

국내 항만 및 어항시설의 액상화 평가에 있어서 액상화 가능성 지수의 적용성 검토

  • Choi, Jae-Soon (Dept. of Civil & Architectural Eng., Seokyeong Univ.)
  • 최재순 (서경대학교 토목건축공학과)
  • Received : 2021.04.12
  • Accepted : 2021.05.08
  • Published : 2021.05.31
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Abstract

After the Gyeongju earthquake, which was the largest in the history of measuring instruments in Korea in 2016, and after the Pohang earthquake, where the pillars of pallet structures were destroyed in 2017, the seismic design standards for all domestic facilities have been revised and supplemented. In particular, during the investigation of the Pohang Earthquake damage cases, liquefaction damage that occurs mainly in countries with strong earthquakes such as the United States, Japan, and New Zealand was found, so studies are being conducted in depth to improve seismic design standards. In this study, the liquefaction potential assessment in the recently revised seismic design standard for port and harbor was reviewed, and an applicability review was conducted focusing on the newly cited liquefaction potential index (LPI). At this time, by varying the thickness and location of the sandy soil where liquefaction can occur, the LPIs for various cases were calculated and compared. Also, 22 LPI values in the practical port area were compared and reviewed along with performance of the liquefaction assessment based on the site response analysis using the boring-hole data of the actual 22 port sites.

2016년 발생한 국내 계기 계측 사상 최대 규모의 경주지진과 2017년 팔레트구조 건축물의 기둥이 파괴되는 등 국내 최대 지진피해가 발생한 포항지진 이후, 국내 모든 시설물에 대한 내진설계기준이 개정되고 있으며 특히, 포항지진 피해사례 조사 도중 미국, 일본, 뉴질랜드 등 주로 강진지역 국가에서 발생하는 액상화 피해가 발견되어 이에 대한 설계기준의 보완도 심도있게 진행되고 있다. 이 연구에서는 최근 개정된 항만 및 어항시설 내진설계기준에서의 액상화 평가방법을 고찰하고 액상화 평가절차에 새롭게 인용된 액상화 가능성 지수(LPI)를 중심으로 적용성 검토를 수행하였다. 이때, 액상화 발생가능한 모래지반을 다양하게 조성하고 이에 대한 케이스별 LPI 값을 산정 비교하였다. 또한, 실제 22개소 항만의 지반자료를 이용하여 지진시 지반응답해석에 기초한 액상화 평가의 수행과 함께 22개소의 LPI 값들을 비교 검토하였다.

Keywords

Acknowledgement

This research was a part of the project titled 'Development of performance-based seismic design technologies for advancement in design codes for port structures', funded by the Ministry of Oceans and Fisheries, Korea.

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