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某海上风电基础地基表层土以软粘土为主,设计中采用抗倾覆好的筒形基础。对于海上风电基础,其持续长时间处于峰值较大的波浪荷载作用下,这种动荷载传到地基,可能造成软粘土地基的弱化,降低风机的稳定性,从而引起上部机构的失稳。为了分析该风电基础的稳定性,该文通过动三轴试验研究其地基土体在波浪荷载作用下的弱化效应,然后利用ABAQUS大型有限元分析软件,对考虑地基土体弱化前和弱化后的稳定性进行计算,计算结果表明考虑土体强度弱化的影响后,地基沉降明显增大,但仍然满足工程安全需要。
The foundation of a certain offshore wind power based on soft clay surface soil, anti-overturning design of the cylindrical base. For the offshore wind power foundation, it continues to be under the peak wave loads for a long time, and this dynamic load spreads to the foundation, which may weaken the soft clay foundation and reduce the stability of the wind turbine, causing the instability of the upper structure. In order to analyze the stability of wind power foundation, this paper studies the weakening effect of the foundation soil under wave load by moving triaxial test. Then, using the ABAQUS large-scale finite element analysis software, considering the weakening of the foundation soil before and after weakened The results show that the settlement of foundation obviously increases after considering the weakening of soil strength, but it still meets the needs of engineering safety.