A method of testing the S-wave velocity of the core samples in laboratory

Accurate measurement of the ultrasonic in different types of cores is the basis for the analysis of the acoustic properties of the core. In general, the core samples used for the ultrasonic transmission test in laboratory are small-sized core samples. When measuring the S-wave of the small-sized core sample, the aftershock of the compression wave, which is hard to be eliminated, may interfere with the recognition of S-wave. In this paper, a method of adding an ‘auxiliary block' in the transmission ultrasonic wave test is provided for measuring the S-wave velocity of the small-sized core samples in laboratory, with which the compression and shear waves can be effectively separated to reduce the measuring error of the S-wave velocity in the core sample and to improve the test accuracy. This paper presents the measuring programme mentioned above and makes the analyses of several test examples. This method can also be used for measuring the S-wave velocities in general solid samples.