The numerical simulation and quantitative study of testing the segregation pile with the low strain method

摘要

With ANSYS/LS-DYNA dynamic analyzing method, the 3-D finite element model of testing segregation piles with low strain method is got. By analyzing reflective oscillogram of the segregation layer with the same thickness but different strength, the method to analyze the strength of the segregation layer is got. By comparing the reflective oscillogram of the concrete with the same strength but different thickness of the segregation layer, the method to test segregation thickness is formed. The experiment states that when the pile defect is qualitatively validated as segregation by accurately analyzing the amplitude of the stress wave of the segregation part and the amplitude of the reflective wave of the bottom pile, including the time corresponding to the amplitude. The level of the defect of the segregation layer can be judged quantitatively in a much smaller error range.