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为了提高测试精度和从测试数据中寻求更多的有用信息以提高判别的准确性,作者进行了不同缺陷模型桩的室内试验研究,并就下列问题作了探讨和提出了改进:激振器的固定方式;原点阻抗法和跨点阻抗法的比较;恒力激振和频变力激振;线性连续扫描和线性步进扫描;信号的滤波和传感器的选择等。根据试验结果分析,特别强调了应把相频特性曲线列为判别桩质量的特性指标之一的重要性,提出再增加最大峰幅值 A_p作为判别的辅助指标。从而提高了判别的准确性。并在此基础上提出了一个试行的判别步骤和方法。
In order to improve the test accuracy and seek more useful information from the test data to improve the accuracy of the discrimination, the author carried out indoor test research on different defect model piles, and discussed and proposed improvement on the following issues: the exciter Fixed mode; comparison of origin impedance method and cross-point impedance method; constant force excitation and frequency change force excitation; linear continuous scanning and linear step scanning; signal filtering and sensor selection. According to the analysis of the test results, the importance of the phase-frequency characteristic curve as one of the characteristic indexes for judging the quality of piles is particularly emphasized. It is proposed that the maximum peak amplitude A_p be added as an auxiliary indicator of the discrimination. This improves the accuracy of the discrimination. On this basis, a tentative decision step and method was proposed.