Research On The Hydrodynamic Characteristics Of Bridge Pile Group-cap Structure Under Wave Action

China has a vast territory,with nearly 3 million square kilometers of sea and 18,000 kilometers long continental coastline.In recent years,China has begun to vigorously develop marine resources,including the mainland coastline and offshore waters,and built a large number of offshore structures within the offshore area.As for the offshore structure,especially for the coastal sea bridge,the wave force is usually regarded as the control loading in the design of the actual project.And it plays a decisive role in the cost of the project,the normal service life and the safety parts.Most of the previous literatures only analyze the hydrodynamic characteristics of the pile structure,but for the cross-sea bridge,the wave force on pile group-cap structure is taken into consideration.Therefore,it is necessary to systematically study the hydrodynamic characteristics of pile group-cap structure under wave action.The main contents of this paper are as follows:(1)Discusses the purpose and significance of the analysis of the hydrodynamic characteristics of the pile group-cap structure,introduces the research status and progress in numerical simulation of waves,and summarizes the method of numerical simulation of wave-structure interaction.(2)Explain and analyze the reliability and accuracy of the numerical simulation method for analyzing the dynamic characteristics of pile group-cap structure.The analysis shows that the result of numerical analysis is feasible and reliable.(3)The effect of cap on the pile group effect of pile foundation was studied by conducting the wave-structure interaction in the three-dimensional numerical wave tank.And the influences of the pile arrangement,the relative pile distance,the bearing structure size and the submerged coefficient on the hydrodynamic characteristics of pile group cap structure are performed.(4)Based on the actual engineering case,the feasibility of using the KG curve of the scale pile group cap structure in the actual engineering structure is verified by using the index of the consistency and the correlation coefficient.The results show that the pile effect coefficient KG of the structure can be used for practical engineering and has some reference for calculating the wave force of the pile structure.