横波偏振方法在煤样超声测量实验中的应用

Application of shear wave polarization method in ultrasonic measurement of coal samples

煤样裂隙、层理发育,煤样横波超声测量一直存在着透射波形混杂、难以准确拾取透射横波初至与波形的问题,从而极大地影响了煤样超声实验中速度与品质因子的测量精度。笔者提出一种利用偏振特性拾取横波初至的方法,并通过宽带滤波提取横波波形,提高了横波波速与品质因子测量的精度。实际煤样的超声测量结果表明:与传统经验测量方法相比,横波速度和品质因子的精度都有了显著的提高,为复杂岩样的超声测量数据分析提供了一种有效的方法。

Due to the interference of transmission waves, there are some problems and difficulties in accurately picking up the first arrival and waveform of transmitted Swave in Swave ultrasonic testing on coal sample all the time. This has a significant impact on the accuracy of velocity and quality factor. Therefore, the authors propose a new method using polarization characteristics to pick up the first arrival of Swave and extract Swave waveform by wideband filte ring to solve this problem in this paper. The test result on coal samples shows that the testing precision of the velocity of Swave and Q has been significantly improved, compared with the traditional method. Also, the study provides an ef fective method for the analysis of ultrasonic testing data of other complex rock samples.