Experimental study on damage properties of rocks under dynamic loading

The damage properties of two types of rocks under dynamic loading are studied. The shock-induced experiments are done using planar impact technique on the one-stage light gas gun, and the ultrasonic tests on the damaged rocks have been made by use of the ultrasonic pulse-transmission method. It is shown that the shock-induced damage of rock is related to the shock speed and the attenuation coefficient of sonic wave, and the latter reflects the damage degree in rock fairly well. The attenuation coefficient can be used as main damage parameter for constructing damage model of rock under dynamic loading.