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Dynamic analysis of multi-compartment bucket foundation based on boundary model
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摘要: 多隔舱筒形基础作为近几年发展起来的海上风电基础结构，其稳定性能极大影响了风机的安全性。为研究在极端风荷载作用下筒形基础的稳定性，通过AR自回归线性滤波法，模拟脉动风速谱，采用边界面弹塑性动力本构模型，运用大型有限元分析软件ABAQUS进行了三维动力数值分析，研究了该结构在随机风荷载作用下的沉降发展、动力响应和周围土体的孔压变化情况。研究表明：随着加载持续，筒体的水平位移、转角和竖向位移均呈缓慢增长趋势，同时筒体顶部水平位移远大于端部位移；基础内部土体孔压受分舱板影响，发展缓慢且小于基础外侧土体孔压，沿筒径方向，越靠近筒壁孔压越大；基础外侧，土体孔压随埋深的增加逐渐减小，最后趋于稳定；土体的应力路径逐渐向临界状态线靠近，但并未达到破坏标准。Abstract: As the infrastructure of offshore wind power developed in recent years, the stability of the multi-compartment cylindrical foundation impacts on the fan’s safety greatly. In order to study the stability of cylindrical foundation under extreme wind load, the AR autoregression linear filtering method was applied to simulate the fluctuating wind speed spectrum in the study, and the boundary surface elastoplastic dynamic constitutive model and the large-scale finite element analysis software ABAQUS were used to analyze the 3D dynamic value, and study the settlement development of the structure under the random wind load, dynamic response and the pore pressure change of surrounding soil. The study indicated: as the loading continued, the cylindrical horizontal displacement, rotation angle and vertical displacement all trended to increase slowly, meanwhile, the cylindrical top horizontal displacement was much larger than that in the end; affected by the subdivision plate, the pore pressure of the soil in the foundation developed slowly and was smaller than that outside the foundation; along the cylindrical diameter, the closer to the cylinder wall, the greater the pore pressure was; on the out side of the foundation, the pore pressure of the soil decreased gradually with the buried depth, and finally tended to be stable; the stress path of soil was gradually close to the critical state line, but did not reach the failure standard.
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图 5 筒体中心点水平位移和转角的时程曲线
Figure 5. Time history curve of horizontal displacement and corner of the bucket center
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图 6 筒体右侧点竖向位移的时程曲线
Figure 6. Time history curve of right point about bucket foundation
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图 8 筒内部两点孔隙水压力时程曲线
Figure 8. Time history curve of pore pressure about two points in a cylinder
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图 9 筒外部两点孔隙水压力时程曲线
Figure 9. Time history curve of pore pressure about two points outside a cylinder
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图 10 超孔压沿不同路径方向变化值
Figure 10. The excess pore pressure changes in the direction of the path
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