Abstract: A 3D elastic-plastic finite element model was established to simulate the interaction between all-vertical piled wharf structure and the ground. Pile load sharing ratio in the group pile foundation, bending moment distribution of pile bodies, soil pressure on pile lateral sides, characteristic of effect of group piles and the critical penetration depth of piles were investigated thoroughly and overall by using the finite element method. The results show that, it is obtained that the group pile effect can be ignored for all-vertical-piled wharf in deep water offshore, that provides basis for ignoring group pile effect in this structural stability calculation and the critical penetration depth of the horizontal bearing group pile in all-vertical piled wharf in deep water offshore.

Key words: port engineering, geotechnical engineering, all-vertical-piled wharf in offshore deep-water, finite element method, effect of pile group, the critical penetration depth

摘要： 采用有限元法，建立了全直桩码头结构-地基相互作用的三维弹塑性有限元模型，研究了该结构群桩基础中各桩荷载分担比、桩身弯矩分布、桩侧土压力分布、群桩效应特性及桩基临界入土深度。结果表明：离岸深水全直桩码头结构群桩基础中群桩效应可忽略不计，这为研究该结构稳定性计算方法时可不考虑群桩效应。通过计算确定了该离岸深水全直桩码头结构水平承载群桩的临界入土深度。

关键词: 港口工程, 岩土工程, 离岸深水全直桩码头, 有限元法, 群桩效应, 临界入土深度