Study On Numerical Simulation Of Interaction Between Pile Foundation And Pier Structure With Steep Slope Deformation

With the further development and construction of hydropower resources in southwest China,the demand for transportation in mountainous areas is increasing.When the route selection has to go through the steep slope,whether for the protection of the ecological environment or the stability of the existing slope,it is necessary to avoid the excessive excavation of the slope body.At this time,the structure of elevated bridge is often adopted,and based on the special terrain conditions,the bridge usually adopts the form of pile-foundation-high pier bridge.In this paper,numerical simulation and theoretical analysis are used to analyze the research object deeply and parameterized analysis is carried out.The software used in this design is used as a tool to construct the corresponding three-dimensional finite element model for the research object,and the static simulation and seismic dynamic simulation process are used to comprehensively evaluate the performance of the model.Furthermore,the relationship between steep slope,pile group foundation and piers is studied.At the same time,the influence law of interaction effect between them is obtained by comparing and analyzing the effect of reinforcement with anchor cable and without anchor cable.(1)This paper establishes a three-dimensional calculation model of pile group foundation and high pier in slope area by using the geotechnical finite element software ABAQUS to simulate the static force of slope,pile foundation and bridge pier under the action of self-gravity stress field.Secondly,On this basis,the static response analysis of pier top under the action of horizontal thrust,axial pressure and bending moment is carried out.(2)On this basis,it firstly inputs the earthquake acceleration to carry on the simulation analysis,through carries on the modal analysis,then takes the velocity,the acceleration,the displacement and the stress and so on the index,The seismic behavior of high pier is studied and compared between the pier model with the interaction of slope group pile foundation and pier with anchor cable reinforcement and the bridge pier model with no consideration of slope pile group foundation and pier interaction with anchor cable reinforcement.(3)On the basis of the research results of pile group foundation,the optimized structure anchorage group pile foundation is calculated.By comparing the structural displacement and stress before and after optimization,it is shown that the displacement of the structure can be restricted in the desired direction,and the stress of the pile is even more uniform,it is suggested that the prestress value should not exceed the pole.10% of the deformable force.(4)Comparing displacement field,velocity field,acceleration field,damage extent of concrete and axial stress of steel bar under the action of ground motion with or without anchor cable at the same time,it shows that anchor cable support is beneficial to the stability of pile foundation and pier.