KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)

Korean Society of Civil Engeneers (대한토목학회)
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Investigation of Strain Behaviour around the Tip of Model Pile - Comparison between Laboratory Model Test and Numerical Analysis -

모형말뚝 선단부 주변의 변형률 거동 분석 - 실내모형실험과 수치해석 비교 -

  • 이용주 (국립서울과학기술대학교 건설시스템디자인공학과) ;
  • 이정민 (국립서울과학기술대학교 토목공학과)
  • Received : 2012.02.22
  • Accepted : 2012.05.08
  • Published : 2012.07.15
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Abstract

In this study, laboratory model pile-load test and finite element analysis were carried out to compare and analyze the strain behaviour around the model pile tip. In order to simulate the pile load, both the LCM(load control method)and DCM(displacement control method) were introduced to determine which one is appropriate for the FE simulation. In contrast to the previous simulation method, two interface elements around the model pile were used to consider the slip effect in the finite element analysis and its results were compared to the model test. Through this study it was found that the degree of non-associated flow was a dominant factor in terms of numerical solution convergence. In addition, an improved FE mesh was required to obtain the symmetric distribution of the maximum shear strain contour.

본 연구는 실내 모형말뚝 재하실험과 유한요소해석을 통해 모형말뚝 선단부 주변 흙의 변형률 거동을 비교 분석하였다. 모형말뚝의 하중을 모사하기 위해 LCM(load control method) 기법과 DCM(displacement control method) 기법을 소개하고, 이 중 수치해석에 타당한 기법을 제안하였다. 유한요소해석에 있어서 말뚝의 미끄럼 거동을 모사하기 위해 기존과는 달리 두 가지 경계면 요소를 사용하여 모형실험 결과와 비교하였다. 본 연구를 통해 비연관 흐름의 정도(degree of non-associated flow)가 수치해석 값 수렴에 중요한 요소임을 알 수 있었다. 또한 수치해석에 있어 대칭인 최대전단변형률 분포를 얻기 위해서는 새로이 개선된 유한요소망(finite element mesh)의 도입이 필요함을 알 수 있었다.

Keywords

References

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