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结合近海风电单桩及四桩基础支撑体系工程实际场地资料,采用有限元数值分析方法,考虑水–土–结构动力相互作用,即考虑流–固耦合效应、饱和土的多孔介质渗流属性及桩–土接触相互作用,分析结构体系动力特性及地震反应。分析单桩有水与无水及四桩有水与无水4种工况支撑体系的自振特性和单桩有水与无水2种工况支撑体系的地震反应。结果表明:水层对结构低阶频率影响不大,对高阶频率降低幅度较大;水层对体系的水平位移、竖向沉降、峰值加速度及有效应力均有不同程度地削减;地震作用下土体的超静孔隙水压力呈现波动特性;结构的位移及应力响应均能满足规范要求。证明考虑多介质耦合的动力有限元分析方法是解决复杂海上风电基础地震响应的有效方法。
Based on the actual field data of offshore wind farms and four foundation supporting systems, the finite element numerical analysis method is used to consider the water-soil-structure dynamic interaction, ie considering the fluid-solid coupling effect, the porous media seepage property of saturated soil and the pile - Soil contact interaction to analyze the dynamic behavior of structural system and earthquake response. The self-vibration characteristics of four kinds of supporting systems with water and no water and four water-bearing and no-water working conditions are analyzed, and the seismic responses of the two supporting systems with water and water are investigated. The results show that the water layer has little effect on the low-order frequency of the structure and the high-order frequency decreases greatly. The horizontal displacement, the vertical settlement, the peak acceleration and the effective stress of the water layer are all reduced to some extent. Under the action of earthquake The excess pore water pressure of the soil presents fluctuating characteristics; the displacement and stress response of the structure can meet the requirements of the specification. It is proved that the dynamic finite element method considering multi-medium coupling is an effective method to solve the complex seismic response of offshore wind farms.