The finite element software ABAQUS was used to simulate the detection of piles by ultrasonic transmission. The influence of the tilted acoustic tube on the testing results of the pile was analyzed. The results showed that, when the pile was complete, the velocity of the sound-depth curve of the received signal was inclined to one side due to the inclination of the acoustic tube and the velocity of the sound seriously deviated from the normal value; when there was a defect in the pile, the signal of the defect was not obvious due to the tilt of the acoustic tube, which was easy to miss or misjudge the defects of the pile. To solve the problem of the inclined acoustic tube, the mathematical model of the position relation of the acoustic tube was established, and the method for correcting the velocity of the sound based on the angle of the acoustic tube was derived. Numerical simulation and engineering examples were used to verify the modified method; the verification showed that the corrected acoustic signal could accurately determine the defects and their positions in the pile, and this method effectively reduced the influence of the tilted acoustic tube on the detection signal, which was beneficial to improve the accuracy of the testing for the pile.

中文翻译：

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超声声波法检测桩中倾斜声管的声速校正方法

使用有限元软件ABAQUS来模拟超声波传输对桩的检测。分析了倾斜声管对桩的测试结果的影响。结果表明，当桩完成后，由于声管的倾斜，接收信号的声深曲线的速度向一侧倾斜，并且声速严重偏离正常值。当桩中有缺陷时，由于声管的倾斜，缺陷信号不明显，容易遗漏或误判桩中的缺陷。为解决声管倾斜的问题，建立了声管位置关系的数学模型，推导了基于声管角度的声速校正方法。数值模拟和工程实例验证了该方法的有效性。验证表明，校正后的声信号可以准确地确定桩中的缺陷及其位置，有效地减小了倾斜的声管对检测信号的影响，有利于提高桩的测试精度。 。