Transient Response Analysis And Damage Diagnosis Of Pile

The foundation of the pile is a reliable basis form,and it is rapidly developedand extensively used.In the actual project, on the one hand,as the dynamic load isharmful than the static load,the static analysis is unable to meet the needs ofengineering design,and the dynamic analysis of pile has become increasinglyimportant. On the other hand, to carry out the quality evaluation and injury diagnosisof the pile require in-depth research and continuous development of the theory of thepile damage diagnosis.Therefore, the transient response of the foundation piles anddamage diagnosis theory is of great theoretical significance and value inengineering.This article introduces a dynamic analysis of pile of reverberation ray matrixmethod. Use this method to study the transient response of piles.It is used ofcontinuous model and it is avoidable divided into a lot of computing units;It is usedof the dual local coordinate system to avoid large index;According to the differentpropagation direction in nodes of the elastic waves,it is defined to the incident andoutgoing waves, Regarding amplitude as the solution of ordinary differentialequation,the physical meaning is definitely and the programming is easily.The maincontents include the following respects:Based on four different pile-soil model, the paper discuss the fluctuationresponds of the top of pile when the complete pile is affected by half a sineexcitation force,which account for the natural frequency and the speed responsecurve of the top of the pile.The result is exactly the same with analytical solutionand it proves this method is correct from the view of time domain and frequencydomain.Through simplifing the pile-soil interaction model to single voigt model todemonstrate the basic equations of the elastic wave in multi-defective piles,thetransient response of the top of multi-defective piles.The influence refering tovelocity-response curve of the degree and type of the defect are also furthercompared, Preliminary discussion on the base of pile damage diagnosis theory.Considering the layer of soil,the paper compares the influence of the uniformfoundation、hard -soft two layer foundation and three layer foundation of the top ofpile velocity-response curve and analyses the influence involving the factors of soil shear wave velocity and thickness of the overlaying soil,it is practice to provide auseful reference for damage diagnostic.