Numerical Simulation Analysis of the Effect of Diameter Expansion Defects on Low-strain Reflection Waves in Pile Foundations
The low strain reflection wave method is widely used for pile integrity testing due to its high efficiency and economic advantages.To investigate the influence of expansion defects on the low strain reflection waveform of pile foundations,the finite element software ABAQUS was used,and the Explicit analysis module was employed to study the laws of the influence of expansion area and expansion thickness on the low strain reflection curve of pile foundations.The results show that:1)Using ABAQUS/explicit analysis module can simulate the low strain reflection curve of pile foundation well;2)When other parameters are constant,as the expansion area or thickness increases,the amplitude of the reflected wave at the expansion site gradually increases,and the reflected wave at the bottom of the pile gradually decreases;3)The larger the thickness of the expansion,the greater the time difference between the appearance and disappearance of the characteristic reflected waves of the expansion;4)On site inspection of pile foundations can only qualitatively determine the severity of defects based on amplitude fluctuation trends,and cannot yet quantitatively determine the area or thickness of diameter expansion.
low strain detectionpile foundation expansion defectsthree-dimensional pile-soil finite element modelnumerical simulation
万方数据
维普
