The motion of large diameter cylinder breakwater under the action of random waves consists of three parts: rotation, rotation-small sliding and rotation-large sliding.

• 摘要根据大直径薄壁圆筒防波堤的受力特征，提出了防波堤可能出现的3种运动模态：摇摆运动、摇摆－小滑移运动和摇摆－大滑移运动。