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2019 Vol.35, Issue 3 Preview Page

Research Article

Evaluation of Estimation and Variability of Fines Content in Pohang for CPT-based Liquefaction Assessment

CPT 기반 액상화 평가를 위한 포항지역 세립분 함량 예측 및 변동성 평가

Tae-Ho Bong1
,
Sung-Ryul Kim2*
,
Byeong-Soo Yoo3
봉 태호1
,
김 성렬2*
,
유 병수3
1Member, Research Assistant Prof., Institute of Construction and Environmental Engrg., Seoul National Univ.
2Member, Associate Prof., Dept. of Civil and Environmental Engrg., Seoul National Univ.
3Member, Graduate Student, Dept. of Civil and Environmental Engrg., Seoul National Univ.
1정회원, 서울대학교 건설환경종합연구소 연구조교수
2정회원, 서울대학교 건설환경공학부 부교수
3정회원, 서울대학교 건설환경공학부 박사과정
* Corresponding Author
31 March 2019. pp. 37-46
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Abstract

최근 다른 현장시험에 비하여 비교적 정확성이 높은 CPT 기반 액상화 평가법의 사용이 증가하고 있다. CPT 기반 액상화 평가는 다양한 흙의 특성을 예측하고 이를 액상화 평가에 활용할 수 있다. 특히, 세립분 함량은 CPT 기반 액상화 평가에서 중요한 입력 변수 중 하나로 이에 대한 정확한 예측식의 사용 및 예측 변동성을 정량적으로 파악하는 것은 매우 중요하다. 본 연구에서는 2017년 포항지진 시 액상화 현상이 관측된 지점에서 수행된 CPT 자료를 이용하여 기존 세립분 함량 예측식들의 오차를 분석하고 포항지역에 적합한 세립분 함량 예측식을 선정하였다. 또한, 지반의 고유한 변동성을 분석하고 CPT의 측정오차, 선정된 예측식에 대한 변환 불확실성을 고려한 세립분 함량의 예측 변동성을 정량적으로 평가하였다.

Recently, the use of CPT-based liquefaction assessment method has increased by providing more accurate results than other field tests. In CPT-based liquefaction evaluation, various soil properties are predicted and they are used for liquefaction potential assessment. In particular, fines content is one of the important input parameters in CPT-based liquefaction assessment, so it is very important to use correct prediction model and to make quantitative evaluation of estimating variability of fines content. In this study, the error evaluation of existing models for prediction of fines content through CPT was performed, and the most suitable model was selected for Pohang area, where the liquefaction phenomenon was observed in the 2017. In addition, the inherent variability of soil was analyzed, and the estimating variability of fines content was evaluated quantitatively considering the inherent variability of soil, measurement error of CPT and transformation uncertainty of selected model.

Keywords
Liquefaction
Fines content
Cone penetration test
Estimating variability

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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 : 35
  • No :3
  • Pages :37-46
  • Received Date : 2019-02-28
  • Revised Date : 2019-03-19
  • Accepted Date : 2019-03-19
  • DOI :https://doi.org/10.7843/kgs.2019.35.3.37
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