Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Estimation of Pile Tension Loads Induced by Excavation in Singapore Soft Clay Applying a Pile-Plugged Jet Grouted Slab

말뚝-그라우트 슬라브가 적용된 싱가포르 연약지반 굴착 시 말뚝 인장력 산정에 관한 연구

  • 이승래 (한국과학기술원 건설 및 환경공학과) ;
  • 박현구 (한국과학기술원 건설 및 환경공학과) ;
  • 심재범 (삼성물산 건설부문) ;
  • 임석산 (삼성물산 건설부문) ;
  • 신강호 (삼성물산 건설부문)
  • Published : 2009.09.30
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Abstract

In the present paper, a numerical study was carried out for a reasonable and realistic evaluation of tension loads in piles during deep excavation in Singapore soft soil applying pile-plugged jet grouted slab. Based on 2-dimensional finite element analyses using linear elastic-perfectly plastic soil model obeying Mohr-Coulomb failure criterion, effects of pile-plugged jet grouted slab on the stability during excavation were examined, and a parametric study was also conducted to investigate critical influencing parameters in the estimation of reliable pile tension loads. Finally, based on the Modified Cam-Clay model, pile tension loads were estimated by considering on-going consolidation state of the Singapore clay deposit and the range of critical parameters observed during laboratory tests.

본 연구에서는 압밀이 진행중인 싱가포르 지역 연약지반에서 말뚝-그라우팅 슬라브 공법이 적용된 흙 막이 굴착 시 합리적인 말뚝의 인장력 산정을 위한 수치해석 연구를 수행하였다. 선형탄성/Mohr-Coulomb소성 모델을 적용한 2차원 수치해석을 통해 굴착 중 말뚝-그라우팅 슬라브 공법에 의한 보강효과를 살펴보았고 다양한 지반 변수에 대한 매개 변수 해석을 수행하여 말뚝 인장력의 산정과 관련하여 핵심적인 영향 인자를 파악하였다. 이를 바탕으로 해성점토 지반의 압밀 상태를 고려하기 위하여 수정 Cam-Clay 모델을 통해 현장의 비배수 전단강도 분포로부터 현장의 유효응력상태를 역으로 추정하였으며 실내 시험 분석을 통해 추정된 핵심 영향 인자의 범위를 산정하여 합리적으로 말뚝의 인장력을 산정하고자 하였다.

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References

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