中文摘要：

研究目的：深海吸力式基础的极限承载能力是海洋工程结构设计中的一个关键问题。准确求解吸力锚桩的极限承载力，能够为深海海洋结构物的稳定性提供技术保障；同时，研究深海吸力锚桩极限平衡条件下的失稳机理，可以为进一步深入研究极限承载力奠定理论基础。研究结论：结果表明，本文给出的位移加载模式，能够较为准确地求解水平载荷与竖向载荷共同作用情况下吸力式基础的极限承载力；吸力式锚桩的极限承载力及其稳定性，受水平载荷和竖向载荷的比值以及作用点的位置影响较大。本文工作为工程实际和理论分析提供了技术支持和理论指导。

英文摘要：

Research purposes： Suction foundation is widely used and its ultimate bearing capacity is a key technology in offshore engineering practice. It can provide technical support for the stability of deep sea structures if the ultimate bearing capacity of suction anchor can be achieved accurately. On the other hand, to study the failure mechanism of suction anchor under limit equilibrium condition, can give a theoretical foundation to research the ultimate bearing capacity of anchor further. Research conclusions ：The results shows that the displacementloading model provided in this paper can solve the ultimate bearing capacity of suction anchor accurately under combined vertical and horizontal loading. The ratio of horizontal and vertical loading and action point of loadings can influence the ultimate bearing capacity and the stability of the suction anchor. The contents of this research can give technical supports in engineering and theoretical direction to analysis.