Research Based On MATLAB Of Measured Curve Matching In High Strain Dynamic Testing Method

With the development of the national construction industry, pile foundation hasbecome an indispensable form of foundations. However, many types of filling pilescome with a variety of engineering defects, which affect the bearing capacity and thesuperstructure safety of the pile foundation. The more serious effects may even makethe pile body lose carrying capacity.Therefore, the integrity testing of the pile body is an important issue of greatconcern to engineering. This paper takes advantage of the principle of theone-dimensional wave equation to fit the measured velocity curve. As a result, thejudgment of the pile body has been obtained.Firstly, a dimensional longitudinal vibration model of pile foundation has beenbuilt. The model mainly focuses on corresponding effects of pile testing fromdifferent types of soil and pile integrity. The model, which was based on theMATLAB finite element program, by using the numerical method, finally obtainedfitting image.Secondly, the high strain dynamic test method was carried out on the numericalmodel. Also, test results were analyzed. The corresponding real value of someexperimental piles was calculated by the finite element model. Moreover, by takingthe measured waveform as the reference, the accuracy and the correctness oftheoretical models was verified.Finally, in contrast to the fitting software CCWAPC, which is commonly used inengineering tests, as the part reference of the parameters of the soil, the actual speedcurve of the model was fitted by the genetic algorithm. A reasonable conclusion wasobtained. Also, the rationality of the model was verified.