Geomechanics and Engineering

  • 제31권2호
  • /
  • Pages.167-181
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  • 2022
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  • 2005-307X(pISSN)
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  • 2092-6219(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

Influence of grain size ratio and silt content on the liquefaction potentials of silty sands

  • Sonmezer, Yetis Bulent (Department of Civil Engineering, Faculty of Engineering, Kirikkale University) ;
  • Kayabali, Kamil (Department of Geological Engineering, Faculty of Engineering, Ankara University) ;
  • Beyaz, Turgay (Department of Geological Engineering, Faculty of Engineering, Pamukkale University) ;
  • Fener, Mustafa (Department of Geological Engineering, Faculty of Engineering, Ankara University)
  • 투고 : 2021.03.19
  • 심사 : 2022.09.30
  • 발행 : 2022.10.25
⟨ 이전 논문 다음 논문 ⟩

초록

Soil liquefaction has been one of the most important concerns in geotechnical earthquake engineering in recent years, due to its damages to structures and its destructive effects. The cyclic liquefaction of silty sands, in particular, remains of great interest for both research and application. Although many factors are known that affect the liquefaction resistance of sands, the effect of fine grain content is perhaps one of the most studied and still controversial. In this study, 48 deformation-controlled cyclic simple shear tests were performed on BS and CS silt samples mixed with 5%, 15% and 30% by weight of Krk085, Krk042 and Krk025 sands in constant-volume conditions to determine the liquefaction potential of silty sands. The tests were carried out at 30% and 50% relative density and under 100 kPa effective stress. The results revealed that the liquefaction potential of silty sand increases with increasing average particle size ratio (D50sand / d50silt) of the mixture for a fixed silt content. Furthermore, for identical base sand, the liquefaction potentials of coarse grained sands increase with increasing silt content, while the respective potentials of fine grained sands generally decrease. However, this situation may vary depending on the silt grain structure and is affected by the nature of the fine grains. In addition, the variation of the void ratio interval was shown to provide a good intuition in determining the liquefaction potentials of silty sands, while the intergranular void ratio alone does not constitute a criterion for determining the liquefaction potentials of silty sands.

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