The vertical bearing characteristic and instability mode of all-vertical-piled wharf in offshore deepwater is studied with a structure-foundation 3D elastic-plastic finite element model.The results show that the vertical bearing characteristic and instability mode of all-vertical-piled wharf in offshore deep-water is closely related with the strength of the foundation soil.The vertical ultimate bearing capacity of this structure is decided by the strength of the foundation soil when there is soft soil foundation,while the vertical ultimate bearing capacity of the structure is conducted by the strength of the foundation soil and the pile when there is hard soil foundation.Therefore,the influence of the adverse factors to the vertical bearing characteristic and instability mode of the structure in the design should be taken into full account,such as the softening effect of soft soil which could reduce the strength of the foundation soil.%建立结构-地基相互作用三维弹塑性有限元模型,分析软土地基上离岸深水全直桩码头竖向承载特性与失稳模式.通过研究得出,竖向荷载作用下,该结构竖向承载特性及失稳模式与土体强度密切相关.当地基较软时,结构竖向极限承载力由地基土体强度决定;当地基较硬时,结构竖向极限承载力由桩身及土体强度共同控制.为此,在进行该类结构设计时,应充分考虑软土地基软化效应等可能降低土体强度的不利因素对结构竖向承载特性及失稳模式的影响.
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