Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Effect of Relative Density and Fines Content on Pullout Resistance Performance of Drilled Shafts

상대밀도와 세립분 함유율이 현장타설말뚝의 인발저항 성능에 미치는 영향에 관한 연구

  • You, Seung-Kyong (Dept. of Civil Engrg., Myongji College) ;
  • Hong, Gigwon (Institute of Technology Research and Development, Korea Engrg. & Construction) ;
  • Jeong, Minwoo (Dept. of Civil Engrg., Chung-Ang Univ.) ;
  • Shin, Heesoo (UCI Tech Co. Ltd) ;
  • Lee, Kwang-Wu (Infra Safety Institute, Korea Institute of Civil Engrg. and Building Technology) ;
  • Ryu, Jeongho (Infra Safety Institute, Korea Institute of Civil Engrg. and Building Technology)
  • 유승경 (명지전문대학 토목과) ;
  • 홍기권 ((주)대한건설이엔지 기술연구소) ;
  • 정민우 (중앙대학교 일반대학원 토목공학과) ;
  • 신희수 (유씨아이테크(주) 연구팀) ;
  • 이광우 (한국건설기술연구원 인프라안전연구본부) ;
  • 유정호 (한국건설기술연구원 인프라안전연구본부)
  • Received : 2018.03.28
  • Accepted : 2018.04.17
  • Published : 2018.04.30
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Abstract

This paper described a results of direct shear test and pullout test by using soil supported by drilled shafts in order to evaluate the effect of relative density and fines content on pullout resistance performance of drilled shafts. The result of direct shear test showed that the variation characteristics of internal friction angle and cohesion could be confirmed quantitatively. The result of pullout test also showed that the effect of relative density and fines content on pullout resistance performance of drilled shafts was confirmed. That is, the contribution of the internal friction angle and cohesion of soils on the pullout resistance performance of drilled shafts was found to vary, when the fines content was about 13% based on results direct shear test and pullout test. Therefore, at design of drilled shafts, the effect of skin friction resistance should be considered on the influence factor of strength parameters ($c-{\phi}$) according to the fines content of soil.

본 연구에서는 상대밀도와 세립분 함유율이 현장타설말뚝의 인발저항 성능에 미치는 영향을 평가하기 위하여, 다양한 상대밀도 및 세립분 함유율 조건에 대한 직접전단시험 및 모형말뚝 인발실험을 수행하였다. 직접전단시험으로부터 세립분 함유율에 따른 내부마찰각과 점착력의 변화특성을 정량적으로 파악할 수 있었으며, 인발실험 결과에서는 말뚝의 인발저항 성능에 미치는 상대밀도와 세립분 함유율의 영향을 확인할 수 있었다. 또한, 두 실험 결과를 비교 분석한 결과, 말뚝의 인발저항 성능에 대한 지반의 내부마찰각과 점착력의 기여도는 세립분 함유율 약 13%를 전후로 하여 서로 다르게 나타남을 알 수 있었다. 따라서 현장타설말뚝 설계 시 수행되는 마찰저항 성능 평가는 지반의 세립분 함유율에 따른 강도정수($c-{\phi}$)를 고려해야 할 것으로 평가되었다.

Keywords

References

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