Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Bearing Capacity of a Monopod Bucket Foundation for Offshore Wind Towers - Centrifuge and Numerical Modeling

해상풍력 모노포드 버켓기초의 지지력 거동 - 원심모형실험 및 수치해석

  • Received : 2012.11.21
  • Accepted : 2013.04.02
  • Published : 2013.04.28
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Abstract

In order to evaluate the bearing capacity behaviour of a monopod suction bucket foundation for an offshore wind tower at the western sea of Korea, a centrifuge load test and numerical analyses were performed. The monopod bucket foundation was designed to be installed in a silty sand layer. The model soil was prepared to simulate a target site by using soil samples having similar properties and controlling relative density. In-flight miniature cone penetration test and bender element array were used to confirm that the model soil had represented the target site conditions. The load - rotation curve of the centrifuge load test was analysed. A series of numerical analyses were performed to validate the experimental conditions. Self-weight of the model, distance to the boundary and elastic modulus of the soil layer were varied to study their effects on the load - rotation curves.

해상풍력 기초로 사용되는 모노포드 석션 버켓기초의 지지력 거동에 대하여 원심모형실험과 수치해석을 통하여 연구하였다. 대상 구조물은 서해안 지역을 대상으로 검토된 해상풍력타워 기초로, 실트질 모래층에 설치하는 것으로 설계되었다. 원심모형실험에 사용된 모형지반은 대상 지반과 유사한 물성을 갖도록 조성하였다. 실험 가속 상태에서 소형 콘 관입시험과 벤더 엘리먼트를 사용한 전단파속도 측정을 통하여 물성을 평가하고 모사 대상 지반과의 유사성을 검증하였다. 원심모형실험으로 해상풍력 기초에 작용하는 하중을 재하하고 거동을 계측할 수 있도록 실험 시스템을 구축하였고, 모노포드 석션 버켓기초의 하중-회전각 관계를 통해서 지지력 거동을 평가하였다. 최적의 실험 조건을 선정 및 검증하기 위하여 수치해석을 수행하였으며, 모델의 자중, 모델과 경계면의 거리 및 지반 탄성계수의 변화에 따른 지지력 거동의 차이를 검토하였다.

Keywords

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