Dynamic Impedance Analysis Of Single Pile In Inhomogeneous Soil

With the rapid development of high-speed railway, pile foundation is widely used as a high-carrying capacity, practical foundation. The load High-speed railway superstructure acts on pile foundation is a dynamic action and the earthquakes effect is also a kind of dynamic action which happened frequently in recent years. Dynamic loads which can also be divided into the horizontal, vertical and torsional loads. There is practical significance to study the soil-pile interaction system under dynamic loads. It also provides a theoretical basis for the interaction between the superstructure and the substructure.We go on our work on the basis of the previous studies.1Dynamic impedance analysis of single’ pile in two-way non-omogeneous soil verticallyBased on the three-dimensional continuum mode,deduce the friction pile dynamic motion equations under the vertical harmonic external loads in two-way non-homogeneous soil, get the dynamic impedance analytical solution on the top of pile under the condition of pile-soil interaction. Analyze the vertical dynamic impedance of the pile top from different parameters of the soil heterogeneity, pile and soil vertical stratification and the bottom of the pile and soil support. By Matlab calculation program to calculate the results of the analysis of the different parameters and draw the frequency domain solution.2Dynamic impendence analysis of single pile in radical inhomogeneous horizontallyBased on the continuous medium model under external level loads, the soil around the pile in the radial direction is divided into within domain soil and outside the domain soil with different nature,deduce the dynamic motion equation of the end bearing pile under the harmonic external level loads. Analyze the impact of pile length to diameter ratio, different modal on soil dynamic impedance and the impact of the soil around the pile and soil Poisson on pile dynamic impedance. By Matlab calculation program to calculate the results of the analysis of the different parameters and draw the frequency domain solution.3Analysis of pile dynamic impedance by Finite element numerical methodBrief introduction of the application of finite element analysis method in the pile dynamic impedance study.Erect the three-dimensional nonlinear finite element analysis model by Considering pile-soil interface contact, the soil nonlinear viscoelastic artificial boundary and pile-soil interaction system. verify the accuracy of the method. Analyze the impact of several main parameters on dynamic impendence and compare the results to analytical solution.