激振面积对低应变动测法影响的数值研究

Numerical study on the effects of excitation area on low-strain integrity test

利用ABAQUS有限元软件建模,分析了基桩横向尺寸对低应变检测的影响.结果表明:(1)在建模过程中,当桩端土厚度及桩周土半径达到桩长的1/2以上时,计算所得数值解可以收敛稳定;(2)基桩横向尺寸对低应变法检测有显著影响,具体与施加激振面积相关,当激振面积较大时,横向尺寸影响能有效弱化;(3)通过实测曲线与数值解比较,二者较为吻合,本文所述规律和方法对工程实践具有一定指导意义.

Effects of horizontal size on low strain integrity test was studied based on ABAQUS finite element modeling.The results show that：（1） In the modeling process,when the soil thickness of pile bottom and the soil radius around pile reach half the length of pile,numerical solution can be converged and stabilized.（2） Horizontal size has a significant influence on low strain integrity test,and as the area of excitation increases,the influence can be effectively weakened.（3） The measured curve is in good agreement with the numerical solutions,therefore the laws and methods proposed above are instructive for engineering.