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Research Article

Evaluation of Liquefaction Triggering for the Pohang Area Based on SPT and CPT Tests

SPT와 CPT 지반조사결과에 기초한 포항지역 액상화 위험도 평가

Yeon-Jun Kim1
,
Kil-Wan Ko2
,
Byung-Min Kim3
,
Du-Hee Park4
,
Ki-Seog Kim5
,
Jin-Tae Han6
,
Dong-Soo Kim7*
김 연준1
,
고 길완2
,
김 병민3
,
박 두희4
,
김 기석5
,
한 진태6
,
김 동수7*
1Graduate Student, Dept. of Civil & Environmental Eng., KAIST
2Member, Postdoctoral Researcher, Dept. of Civil & Environmental Eng., KAIST
3Member, Assistant Prof., Dept. of Urban and Environmental Eng., UNIST
4Member, Prof., Dept. of Civil and Environmental Eng., Hanyang Univ.
5Member, Chief Executive Officer, Heesong Khmer Corporation
6Member, Research Fellow, Dept. of Infrastructure Safety Department, Seismic Safety Research Center, KICT
7Member, Prof., Dept. of Civil & Environmental Eng., KAIST
1비회원, 한국과학기술원 건설 및 환경공학과 석사과정
2정회원, 한국과학기술원 건설 및 환경공학과 박사후연구원
3정회원, 울산과학기술대학교 도시환경공학과 조교수
4정회원, 한양대학교 건설환경공학과 교수
5정회원, ㈜희송지오텍 대표이사
6정회원, 한국건설기술연구원 인프라안전연구본부 지진안전센터 연구위원
7정회원, 한국과학기술원 건설 및 환경공학과 교수
* Corresponding Author
31 October 2020. pp. 57-71
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Abstract

본 연구에서는 2017년 11월 15일 포항지진 시 액상화 위험도가 높았던 5개소의 부지에 대해 액상화 가능성을 재분석하였다. 액상화 지진 하중은 포항 지진파를 지반예측운동방정식(Ground motion prediction equation, GMPE)로 산정한 응답스펙트럼에 보정한 결과를 입력 지진파로 사용하였다. 지반의 액상화 저항력은 현장 시험 중 표준관입시험(Standard Penetration Test, SPT)과 콘관입시험(Cone penetration test, CPT)을 통해 결정되었다. 한편, 액상화 발생 가능성은 지반 액상화 지수(LPI)를 통해 정량화되었으며 이를 기존 연구 결과와 비교하였다.

Liquefaction-induced sand boils were observed during the Pohang earthquake (Moment magnitude, 5.4) on November 15, 2017, specifically in the region of agricultural fields and park areas near the epicenter. This was recorded as the first observed liquefaction phenomenon in Korea. This paper analyzes liquefaction potentials at the key sites at Pohang area. The simplified methods and current design standard were used to evaluate the occurrence of liquefaction. The seismic demand was estimated based on the NGA-WEST2 ground motion prediction equations (GMPEs). The liquefaction resistance of the ground was determined using the in-situ tests: standard penetration test (SPT) and cone penetration test (CPT). The liquefaction potentials were quantified by liquefaction potential index (LPI), which were compared with those from the previous studies.

Keywords
Liquefaction
Simplified method
Triggering evaluation
Pohang earthquake
Seismic design code
LPILSN
LSN

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Information
  • Publisher :The Korean Geotechnical Society
  • Publisher(Ko) :한국지반공학회
  • Journal Title :Journal of the Korean Geotechnical Society
  • Journal Title(Ko) :한국지반공학회 논문집
  • Volume : 36
  • No :10
  • Pages :57-71
  • Received Date : 2020-09-28
  • Revised Date : 2020-10-15
  • Accepted Date : 2020-10-16
  • DOI :https://doi.org/10.7843/kgs.2020.36.10.57
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