锚杆无损检测稳定波形的激振点和检测点

The Excitation Point and Detection Point of the Stable Waveform of Anchor Rod Nondestructive Testing

为研究锚杆无损检测稳定波形的激振点和检测点,利用FLAC3D数值模拟软件建立锚固体模型,在模型锚杆端头不同位置施加瞬态激振进行数值计算,研究表明:在锚杆无损检测时,随着偏离锚杆端头中心位置的长度增加,横向应力波的振幅也逐渐增大,对纵波的影响也逐渐增大,最佳激振点应该选择锚杆端头中心位置;在锚杆无损检测时,选择最佳激振点激振后,检测点的位置变化对横向应力波形和纵向应力波的影响可以忽略不计;选择最佳激振点得到的纵波可以清晰地得到锚固起始位置和锚固结束位置,为工程检测提供了理论依据,提高了工程检测的准确性.

In order to study the excitation point and detection point of the stable waveform of the anchor nondestructive testing, FLAC 3D numerical simulation software is used to establish the anchor solid model, and the transient excitation is applied to different positions of the end of bolt for numerical calculation. Results show that when the amplitude of transverse stress wave increases, the influence on the longitudinal wave will increase with the length of deviation from the central position of the end head of the bolt increases during the non-destructive testing of the bolt. The effect of the position change of the check point on the transverse stress wave and the longitudinal stress wave can be neglected when the best excitation point is selected for the non-destructive testing of the anchor bolt. By choosing the best excitation point, the starting position and ending position of anchorage can be clearly obtained, which provides theoretical basis for engineering detection and improves the accuracy of engineering detection.