A Short-Bar Combined-Wave Method for Wave Propagation Coefficient Determination.

A combined-wave method which can significantly reduce the length of the rock bar was proposed for investigating the stress wave propagation through micro-defected rock mass. A series of short-bar pendulum impact tests were carried out to obtain the combined waves. Subsequently, wave propagation coefficients (e.g. the attenuation coefficient and wave number) were derived based on the present combined-wave method. Finally, the present combined-wave method was validated using the traditional separated-wave method based on a series of long-bar pendulum impact tests. The results show that the wave propagation coefficients obtained by the present combined-wave method using a 0.6 m bar agree well with those obtained by the traditional separated-wave method using a 1.2 m bar. The present combined-wave method overcomes the disadvantage of the traditional separated-wave method, which requires a long bar to prevent wave superposition. Highlights: A series of short-bar pendulum impact tests were conducted. A combined-wave method based on short-bar pendulum impact tests was proposed. The present combined-wave method was validated. Wave propagation coefficient can be determined by the present method efficiently. [ABSTRACT FROM AUTHOR]