淤积与船舶撞击对高桩码头桩基受力的影响分析

Analysis of the impact of sediment siltation and vessel collision on pile foundation stress in high-pile wharves

中国部分高桩码头下方存在较大的泥沙淤积,且初始设计时并未考虑淤积的影响,较大淤积时淤积土体及船舶撞击会对码头桩基受力产生耦合影响。建立了船舶撞击-上部结构-桩基-土体相互作用的三维有限元数值模型,模拟分析回淤土体和船舶撞击作用对高桩码头桩基受力的影响。结果表明,土体淤积严重位置处的桩顶局部最大主应力、剪力、弯矩相较回淤前均增幅较大,淤积土体对桩基受力的影响十分显著。当法向船舶撞击速度为0.1和0.2 m/s时,船舶撞击力对桩基的影响小于回淤土体的影响。码头不同排架之间的桩基受力存在一定差异。码头后方桩基顶部最为危险,桩基顶部弯矩接近混凝土开裂弯矩,导致桩基容易出现开裂损伤。

Significant sediment siltation exists beneath certain high-pile wharves in China,which was not accounted for in the initial design.This sediment siltation,combined with vessel collisions,results in a coupling effect on the stress experienced by the pile foundation.A 3D finite element numerical model was established to simulate the interaction between vessel collisions,superstructures,pile foundations,and soil,analyzing the effects of sediment siltation and vessel impacts on pile foundation stress in high-pile wharves.The results indicate that the maximum principal stress,shear force,and bending moment at the pile tops in areas of severe sediment siltation significantly increase compared to pre-siltation conditions,highlighting the critical influence of sediment on pile foundation stress.For vessel collision velocities of 0.1 and 0.2 m/s,the impact of vessel collisions on the pile foundation is less significant than that of the sediment siltation.Variations in stress are observed between different bent frames of the wharf,with the pile foundation tops behind the wharf being most vulnerable,where the bending moment approaches the cracking moment of the concrete,increasing the risk of damage and cracking in the pile foundation.