Research Of Dynamic Stability Of Pile Foundation In Different Engineering Environment

This article on the basis of existing research results at home and abroad established a finite element model which is about pile dynamic instability analysis, according to the structure Characteristics of the pile and actual application situation. The paper determined the manner of action load, analyze the characteristic of pile foundation with dynamic loading action.Calculation formula of pile stability critical length was deduced in the vertical vibration load by the method of structure stability theory, considering the influence of the critical length in different soil, different damping, different pile diameter and different frequency. The numerical method was used to calculate different frequency corresponding to different critical length, comparing to the analytic solution.The influence curve of pile critical load in the vertical vibration load was discussed by the structure stability theory method in different frequencies, different pile diameter, factors such as different pile length. With dynamic buckling discriminant criteria, Pile critical load was derived indirectly by using finite element analysis in different pile diameter, different pile length, then, compared and analyzed two experimental data calculated results.The simple2d pile model was studied preliminarily by finite element analysis. Compared displacement in X, Y direction of pile group in the different pile bottom restraint and resonant load action; Displacement of the joints of pile group and caps was changed according to different resonant load in different pile spacing case,which was Analyzed. All that can provide the reference for engineering design and analysis of pile foundation.