Numerical Simulation Analysis Of Sheet-piled Wharf Structure

As one of the three port structure,sheet-piled wharf widely used at home and abroad with lower cost,shorter construction period,saving shoreline resources for main members.At present,the deepwater structure of piled wharf is mainly developed towards the sheet-piled and unloading direction.This paper focuses on the research of the sheet-piled structure.The calculation method has not yet formed a unified standard and is still in a research and development stage because of its complicated force mechanism.Currently domestic and foreign scholars are more from the static research,for the seismic action of the sheet-piled wharf structure of the dynamic response less.China is a country with many earthquakes,and the seismic design of the quay structure is still in a relatively slow state.Therefore,it is of great research significance to conduct seismic analysis.In this paper,the specific project is taken as a background.The static and dynamic force characteristics of the sheet-piled wharf structure are studied with the help of the finite element software ABAQUS.The nonlinear constitutive model of soil is established,the nonlinear characteristics is considered,two-dimensional and three-dimensional model are established respectively,the main contents are as follows:(1)The research status of sheet-piled structures at home and abroad is summarized in this paper.The constitutive model of soil is introduced,contact theory is discussed,dynamic balance calculation and damping theory are considered.The numerical simulation is verified rationality by establishing three-dimensional static model and comparing the prototype observation results of engineering site.(2)The calculation methods of soil pressure and the calculation method of horizontal displacements of front wall are summarized systematically,which are generally accepted by scholars at home and abroad.Comparing the calculated results of earth pressure theory with the results of numerical simulation and field prototype,the direction of active soil pressure shows a nonlinear distribution.(3)The method of controlling variables is used to establish the two-dimensional model to verify the existence of soil arching effect between blinds and piles.The effect of internal friction angle,cohesion and spacing of blinds on soil arching effect were studied.A three-dimensional model is established to compare the stress conditions with covered piles or with no covered piles to obtain the superiority of blind curtain structure.The influence of the length of the blinding pile,the distance between the front wall and the covered pile,and the depth of the front wall into the soil are studied to obtain the relevant laws.(4)The three-dimensional numerical model is established using finite element-infinite element coupling.The effect of seismic wave intensity and different seismic waves on the dynamic response of the structure is studied considering only the horizontal seismic wave.The laws of acceleration time history,stress response,soil pressure response and displacement response at the top of the front wall are derived to provide references for seismic design.