Low Strain Simulation And Quantitative Analysis Of Foundation Pile

In China,a large number of pile foundations are widely used and then a variety of pile foundation detection technologies emerge.Among them,the low-strain reflected wave,as a common foundation pile dynamic measurement technology,is widely used in a variety of engineering practices to detect the structural integrity of pile body.Compared with other detection methods,the low strain reflected wave method is the main form of pile foundation testing quality,with its advantages of wide measuring point,fast,convenient and economical.However,the low strain reflection wave method is still a practical technology in development,and there are many problems to be solved in theory and application,and this method has many limitations.In the process of pile foundation testing,qualitative testing is far from enough,and quantitative analysis plays an important role in the quality of pile foundation.This paper introduces the current situation,development history and development trend of the low-strain reflection wave method.Based on the consideration of damping,a new mathematical model of pile-soil interaction is established.The displacement response and velocity response of pile top are analyzed under the initial conditions and different boundary conditions.UG software was used to establish the solid model of pile and soil,and ANSYS/LS-DYNA program was used to solve the velocity response of pile top under transient excitation.Through the calculation of pile length and defect location,the validity of numerical simulation and the reliability of calculation results of the finite element model of pile and soil are verified.Based on MATLAB platform,based on the mathematical model between piles and soil,the quantitative analysis program of foundation pile is developed by using the least square method.The parameters of foundation pile are quantitatively analyzed by fitting the model curve and the measured curve.The feasibility of this method is verified by analyzing and processing the actual engineering pile on a construction site.