摘要
海上风机结构属于高耸结构,风机基础过大的水平位移,将会影响风机结构的整体稳定性,因此研究风机基础的水平位移的影响因素规律具有重要意义。基于OPENSEES有限元平台,建立海上风机动力分析模型,探讨了水体附加质量对桩基桩顶水平位移的影响,同时分析了海水深度、钢管桩壁厚、土的有效重度、内摩擦角、不排水剪切强度等因素对风机基础桩顶水平位移的敏感性。研究结果表明水体附加质量对大直径钢管桩的桩顶水平位移影响较小,最大约为1%;砂土地基中,影响桩顶水平位移的主要参数是内摩擦角,软粘土地基中,影响桩顶水平位移的主要参数是钢管桩的桩径;在砂土和软粘土中,桩基础的埋深对桩顶水平位移的影响均存在一个临界深度。
The structure of offshore wind turbine is a high-rise structure. Excessive horizontal displacement of the monopile foundation can affect the overall stability of the structure of offshore wind turbine. Therefore, it is significant to study the influencing-factor law of the horizontal displacement of monopile foundations. Based on the OPENSEES finite element platform, the dynamic analysis model of offshore wind turbines is established, so as to discuss the effect of additional water mass on the horizontal displacement of the pile top. It also studies the depth of seawater, the thickness of steel pipe piles, the effective weight of soil, the internal friction angle, the undrained shear strength and other factors in terms of the sensitMty of horizontal displacement about the pile top of the offshore wind turbine foundation. The research results show that the effect of additional water mass on the horizontal displacement of the pile top of large-diameter steel pipe piles is little and at most about 1%. In the sand foundation, the main parameter affecting the horizontal displacement of the pile top is the internal friction angle, while in the soft clay foundation, such main parameter is the pile diameter of steel pipe piles. In sand soil and soft clay, the depth of pile foundation has a critical depth for the horizontal displacement of pile top.
作者
许成顺
孙毅龙
张小玲
席仁强
XU Cheng-shun;SUN Yi-long;ZHANG Xiao-ling;XI Ren-qiang(Key Laboratory of Urban Security and Disaster Engineering,Ministry of Education,Beijing University of Technology,Beijing 100124,China)
出处
《海洋技术学报》
2018年第4期82-88,共7页
Journal of Ocean Technology
基金
国家自然科学基金优秀青年基金资助项目(51722801)
关键词
海上风机
单桩基础
水平位移
OPENSEES
敏感性分析
offshore wind turbine
monopile foundation
the horizontal displacement
OPENSEES
sensitivity analysis
