Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Characterization of Composite Ground Reinforced with Recycled-Aggregate Porous Concrete Pile (RAPP)

순환골재 다공질 콘크리트말뚝(RAPP)에 의해 보강된 복합지반의 거동 특성

  • You, Seung-Kyong (Dept. of Civil Engrg., Myongji College) ;
  • Kim, Se-Won (School of Civil, Environmental & Architectural Engrg., Korea Univ.) ;
  • Lee, Chul-Ho (School of Civil, Environmental & Architectural Engrg., Korea Univ.) ;
  • Choi, Hang-Seok (School of Civil, Environmental & Architectural Engrg., Korea Univ.)
  • 유승경 (명지전문대학 토목과) ;
  • 김세원 (고려대학교 건축사회환경공학과) ;
  • 이철호 (고려대학교 건축사회환경공학과) ;
  • 최항석 (고려대학교 건축사회환경공학과)
  • Published : 2009.11.30
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Abstract

In this paper, a series of laboratory chamber tests were carried out to evaluate the applicability of a porous concrete pile fabricated with recycled aggregates (RAPP) for the soft ground improvement. While performing the laboratory chamber tests for the RAPP, the surface settlement, excess pore pressure and vertical stress distribution with time were compared with those of SCP provided by You (2003) under the same experimental condition. In addition, the experimental results were compared with the numerical simulation using ABAQUS in this study. The results show that the settlement reduction is significantly enhanced due to the stress-sharing mechanism between the RAPP and soil formation by stress concentration on the RAPP. Furthermore, the comparison of consolidation rate shows that the RAPP can accelerate consolidation as well, which behaves as a vertical drain.

본 논문에서는 순환골재 다공질 콘크리트말뚝(Recycled-Aggregate Porous Concrete Pile, RAPP)에 의한 지반개량효과를 파악하기 위하여 기존에 수행된 실내모형실험(유승경 등, 2008(a)) 결과를 분석하였다. 본 연구에서 얻어진 실험 결과를 동일한 조건에서 수행한 SCP 실험 결과와 비교하여 RAPP로 개량된 복합지반의 침하량과 과잉간극수압 및 연직응력증분의 시간에 따른 변화 특성과 복합지반의 거동 특성을 비교, 분석하였다. 또한, 수치해석을 통하여 실내모형실험 결과를 평가하였다. 그 결과, RAPP로 개량된 복합지반에서 하중재하시 응력분담이 뚜렷이 발생하여 침하저감 효과가 크게 얻어졌다. 또한, 복합지반의 압밀도를 산정하여 분석한 결과, RAPP는 배수재로서의 기능을 충분히 발휘하여 압밀촉진 효과가 있음을 확인할 수 있었다.

Keywords

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