海上风电吸力桶基础地震分析

发布时间：2018-05-04 09:35

本文选题：海上风电 + 吸力桶基础　；参考：《清华大学学报(自然科学版)》2017年11期

【摘要】：为进行海上风电吸力桶基础地震安全评估,选取欧洲北海砂质海床中典型的吸力桶基础,基于三维砂土液化大变形统一本构模型,通过OpenSees有限元开源平台进行三维动力计算,分析了吸力桶基础的地震变形和倾覆转角。吸力桶基础的地震变形具体如下:基础产生一定的水平位移震荡,最终累积发展为大变形;桶基发生严重的不均匀沉降,桶基后部出现一定程度的上移;倾覆转角不断增加,最终达0.8°以上,远超过规范规定的安全稳定运营值,后期无法运营;基础转动中心在地震过程中不断调整;地震中海床孔压上升,桶基内出现一定的负孔压,可以提高抗倾覆承载力,地震结束时负压区消散。海床液化深度约3m,桶基前部产生刺入海床破坏。海床地震液化加剧了吸力桶基础的变形和倾覆,严重影响着海上风机的安全运营。
[Abstract]:In order to evaluate the seismic safety of the suction bucket foundation of offshore wind power, the typical suction bucket foundation in the sand seabed of the North Sea of Europe is selected. Based on the unified constitutive model of large deformation of three dimensional sand liquefaction, the 3D dynamic calculation is carried out by using the OpenSees finite element open source platform. The seismic deformation and overturning angle of suction bucket foundation are analyzed. The seismic deformation of the suction bucket foundation is as follows: the foundation produces a certain horizontal displacement oscillation, which eventually accumulates into a large deformation; the bucket foundation has serious uneven settlement, and the back part of the bucket foundation is moved up to a certain extent; the overturning angle is increasing. In the end, the operating value of safety and stability is far above 0.8 掳, which is far more than the safe and stable operating value specified in the code, and cannot be operated in the later period; the rotation center of the foundation is constantly adjusted during the earthquake; the pore pressure of the seabed increases during the earthquake, and a certain negative pore pressure appears in the bucket foundation. The overturning bearing capacity can be increased and the negative pressure area dissipates at the end of the earthquake. The liquefaction depth of the seabed is about 3 m, and the front part of the bucket foundation is impinging into the seabed. Seismic liquefaction of seabed intensifies the deformation and overturning of suction bucket foundation, which seriously affects the safe operation of offshore fan.
【作者单位】：清华大学土木水利学院岩土工程研究所;清华大学水沙科学与水利水电工程国家重点实验室;
【基金】：国家重点研发计划项目(2016YFC1402806) 国家自然科学基金项目(50979046) 教育部研究项目(2014Z09100)
【分类号】：TU435

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