为了研究海洋环境中，局部冲刷条件下，吸力式筒形基础受风、浪、流等循环荷载作用的循环承载特性，开展了无冲刷和局部冲刷后基础的水平静力加载及循环加载的模型试验，同时建立数值模型，验证数值模型可靠性，模拟全尺寸三筒基础水平静力加载及循环加载，分析局部冲刷前后基础的破坏模式、转角和刚度变化以及循环加载前后基础的承载力变化。结果表明：局部冲刷条件下基础受水平荷载作用的循环响应与无冲刷条件类似。局部冲刷影响下，基础承载力弱化更明显。原型尺寸下的吸力式三筒基础受循环荷载作用会出现“自我修复”的特征。荷载幅值比和荷载对称比均与累积转角正相关，与循环刚度负相关。循环刚度随着冲刷率的增大逐渐下降。

To investigate the cyclic bearing behavior of suction caisson foundations subjected to cyclic loads—such as those from wind, waves, and currents—under local scour conditions in marine environments, model tests were conducted under both unscoured and locally scoured conditions. In addition, a numerical model was developed to simulate the static and cyclic loading of full-scale suction caisson foundations and to verify its reliability. Failure modes, angular displacements, and stiffness variations of the foundations were analyzed before and after local scour, as well as changes in bearing capacity before and after cyclic loading. The results indicate that the cyclic response of the foundation to horizontal loads under local scour is similar to that under unscoured conditions. However, the reduction in bearing capacity is more significant under local scour. At full scale, the suction caisson foundation demonstrates a “self-repairing” behavior under cyclic loading. Both the load amplitude ratio and the load symmetry ratio are positively correlated with the cumulative angle of rotation and negatively correlated with cyclic stiffness, which gradually decreases as the scour rate increases.