Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Effect of Fines Content Including Clay on Liquefaction of Silt

점토를 포함한 세립분 함유량이 실트의 액상화에 미치는 영향

  • Hur, Soung-Hoon (Dept. of Civil Environmental Engrg., Korea Maritime and Ocean Univ.) ;
  • Lee, Seong-Cheol (Dept. of Civil Environmental Engrg., Korea Maritime and Ocean Univ.) ;
  • Kim, Tae-Hyeong (Dept. of Civil Environmental Engrg., Korea Maritime and Ocean Univ.) ;
  • Kim, Byeong-Jun (Dept. of Civil Environmental Engrg., Korea Maritime and Ocean Univ.)
  • 허성훈 (한국해양대학교 토목환경공학과) ;
  • 이성철 (한국해양대학교 토목환경공학과) ;
  • 김태형 (한국해양대학교 토목환경공학과) ;
  • 김병준 (한국해양대학교 토목환경공학과)
  • Received : 2021.05.10
  • Accepted : 2021.08.04
  • Published : 2021.08.31
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Abstract

Liquefaction behaviors of two natural silty samples containing fines including clay of 50% or more (Sample No.1 was silt 44.1% and clay 8.8%, sample No.2 was silt 57.2% and clay 12.4%) were examined by a cyclic triaxial test. According to the results on samples containing 50% or more of fine particles, an increase in the fine content decreases the liquefaction resistance of the sample. In other words, when the fine content increases, the liquefaction state of sample is reached with a small number of cyclic loads. In the relationship between the excess pore water pressure ratio and the number of cycles, the slope of the excess pore water pressure ratio increases more steeply as the fine content increases. As a result of analyzing the liquefaction behavior of the two silts with the content of clay contained in the fines, liquefaction occurred more easily in the No.2 silt with high clay content. This result shows that the clay contained in the fines affects the liquefaction behavior of the silt.

본 연구에서는 점토를 포함한 세립분의 함유량이 50% 이상인 두 실트(No.1 시료는 실트 44.1% 점토 8.8%, No.2 시료는 실트 57.2% 점토 12.4%)의 액상화거동을 반복삼축압축시험을 통해 평가하였다. 시험결과, 세립분 함유량이 50% 이상인 시료에서, 세립분 함유량의 증가는 시료의 액상화 저항을 감소시키는 것으로 나타났다. 즉 시료에서 세립분 함유량이 증가하면 적은 반복재하 횟수에서 시료는 액상화 상태에 도달한다. 과잉간극수압비와 반복횟수의 관계에서 과잉간극수압비 증가 기울기는 세립분이 증가하는 경우 더 가파르게 증가하였다. 두 실트 시료의 액상화 거동을 세립분에 포함된 점토의 함유량으로 분석해 본 결과, 점토의 함유량이 높은 No.2 실트에서 액상화가 더 쉽게 발생하는 것으로 나타났다. 이것은 세립분에 포함된 점토가 실트의 액상화 거동에 영향을 미치는 것임을 보여준다.

Keywords

References

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