波浪荷载作用下单桩基础桩周土体的应力位移分析

Displacement and Stress of Soil Around the Single Pile Foundation Under Wave Loading

通过ABAQUS建立海上风电单桩基础的数值模型,并与室内模型桩试验的结果作对比,验证模型的可靠性。根据实际桩土参数建立数值模型,并对桩土模型施加循环波浪荷载,分析波浪荷载作用下桩周土体的水平应力和水平位移随时间的变化特性,以及土体水平位移在空间分布上的差异。结果表明在波浪荷载作用下桩周土体的水平应力和水平位移在一定范围内循环波动,且极端海况下土体所受的扰动远大于正常海况下土体所受扰动。海床表面桩周土体在距桩体10 m范围内受桩体影响显著,竖直方向上桩身以泥面以下大约2/3桩身入土深度处的一点为基点做循环摆动,且这一旋转基点的位置与波浪力的大小无关。

The numerical model of the offshore wind power single pile foundation is established by ABAQUS and it is compared with the results of the indoor model pile test to verify the reliability of the model. The numerical model is established according to the actual pile-soil parameters, and the cyclic wave load is applied to the pile-soil model. Analyse the horizontal stress and horizontal displacement of soil around the pile under the action of wave load with the change over time, and analyse the difference in spatial distribution of horizontal displacement of soil. The results show that the horizontal stress and horizontal displacement of the soil around the pile are cyclically fluctuated within a certain range under the action of wave load, and the disturbance of the soil under extreme sea conditions is much larger than that of the soil under normal sea conditions. The soil around the pile on the seabed surface is significantly affected by the pile within the distance of 10 m from the pile body. In the vertical direction, the pile body oscillates cyclically at a point about two-thirds of the depth of the pile entering the soil below the mud surface. And the position of this rotation base point is independent of the magnitude of the wave force.