원심모형실험을 이용한 해상풍력발전기전문설치선의 스퍼드캔 제팅 시스템 성능 분석
Evaluation of the Spudcan Jetting System for Wind Turbine Installation Vessel Using Centrifuge Model Test
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초록
Wind energy is an important alternative clean energy source that will contribute to solving the renewable energy needs. In particular, higher wind speeds are available offshore compared to that on land. Therefore the offshore wind power generator can beadopted to generate much power. The wind turbine installation vessel (WTIV) is a new type of mobile jack-up vessel that is designedfor the requirements of the offshore wind power industry. The elevating process for the jack-up legs of WTIV can be quite difficultbecause of the high extraction resistance caused by clay. In soft clay, a high suction force can develope around the spudcan attached tothe end of the jack-up legs. Therefore, a jetting system is required to break the suction to pull out the legs. It is important to design ajetting system with an optimized piping and nozzle arrangement to allow easy operation. To evaluate the jetting system performance,it is essential that the model test be performed within the soil base. Spudcan jetting tests were performed in a geotechnical centrifuge. This study introduces the design of the jetting system considering the soft foundation and the centrifuge model test to verify theperformance of the spudcan jetting system.
Abstract
Wind energy is an important alternative clean energy source that will contribute to solving the renewable energy needs. In particular, higher wind speeds are available offshore compared to that on land. Therefore the offshore wind power generator can beadopted to generate much power. The wind turbine installation vessel (WTIV) is a new type of mobile jack-up vessel that is designedfor the requirements of the offshore wind power industry. The elevating process for the jack-up legs of WTIV can be quite difficultbecause of the high extraction resistance caused by clay. In soft clay, a high suction force can develope around the spudcan attached tothe end of the jack-up legs. Therefore, a jetting system is required to break the suction to pull out the legs. It is important to design ajetting system with an optimized piping and nozzle arrangement to allow easy operation. To evaluate the jetting system performance,it is essential that the model test be performed within the soil base. Spudcan jetting tests were performed in a geotechnical centrifuge. This study introduces the design of the jetting system considering the soft foundation and the centrifuge model test to verify theperformance of the spudcan jetting system.
참고문헌 (6)
- Vazques, L.H., "Jack up primer, Jack up units : A technical primer for the offshore industry professional", ~ (2005)
- 조철희, "해상풍력발전기설치선의 제팅 시스템 설계 소개", 한국해양과학기술협의회 공동학술대회 논문집, pp.2092~2095 (2013)
- Osborne, J.J., "InSafeJIP : Improved Guidelines for the prediction of geotechnical performance of spudcan foundations during installation and removal of jack-up units", ~ (2011)
- Gaudin, C., "Investigation of the potential of bottom water jetting to ease spudcan extraction in soft clay", Geotechnique, 64(12), pp.1043~1054 (2011)
- Aldridge, T. R., "Assessment of conductor setting depth", Proc. of Offshore Technology Conference, pp.167~176 (1991)
- Gaudin, C., "Recent contributions of geotechnical centrifuge modeling to the understanding of jack-up spudcan behavior", Ocean Engineering, 38, pp.900~914 (2011)