考虑泥沙淤积影响的高桩码头三维有限元分析

泥沙淤积将影响高桩码头的正常使用。为掌握泥沙淤积对高桩码头基桩的影响规律，借助有限元分析方法，结构与土均按三维实体单元建模，桩土间设置接触单元考虑桩土相互作用，采用单元生死近似考虑泥沙淤积过程，岩土参数采用实测位移资料进行校准。分析结果表明，泥沙淤积引起的附加土压力将使最大弯矩出现在基桩顶部，且大部分为陆侧受拉，最危险截面出现在桩头向海的桩顶附近；对泥沙进行清淤处理后，将明显改善基桩受力状态，极大降低淤积对基桩造成的不利影响。

Three-dimensional finite element analysis of pile-supported wharf considering sediment deposition

The service of pile-supported wharf will be influenced by sediment deposition.In order to study the influence law of sediment deposition on piles,the following works are finished:the structures and soils are modeled by three-dimensional solid elements,contact elements are set up to consider interaction of piles and soils,the birth and death of elements are used to model the sediment deposition,and geotechnical parameters are calibrated by measured displacements.The result shows that the maximum bending moment will appear at the top of pile under additional earth pressure by sediment deposition,and the most of piles are in tension at the landside section while the worst section is at the top of piles which towards the sea.The stress condition of piles will be obviously improved and the influence of deposition will be reduced after excavating sediment.