各向异性岩体超声波测试试验研究

Ultrasonic Test Research on Anisotropic Rock Mass

以厦门海底隧道为工程背景,开展一系列声波测试工作,研究了岩样内部裂隙及岩样致密性对声波参数的影响。研究表明:岩样内部的裂隙会对横波产生阻波效应,使横波波速在阻波效应发生的方向上波速明显降低,而对纵波波速则影响不大;松散的内部结构引起的几何弥散效应、反射等现象,不仅使横波和纵波的波速明显减小,而且会降低纵波的主频和振幅。

Indoor sound wave measurements were taken to study the influence of inner cracks and specimen compactibility on the ultrasonic wave parameters. Measurements were taken at the Xiamen submarine tunnel project in P. R. China. Test results show that inner cracks generate the wavestop effect on S-waves, thereby rapidly decreasing S-wave velocity. As for P-waves, inner cracks have minimal influence on their velocity. Test results also show that loose-packed microstructure specimens reduce not only the S-waves velocity but also the P-waves velocity, dominant frequency and amplitude due to the effects of geometry scattering and reflection.