A New Damage Model for Rock Fragmentation by Blasting Based on Stress Wave Attenuation and its Application

摘要

In this paper, a new damage model based on the existing TCK models has been developed for rock fragmentation by blasting, in which the attenuation of wave velocity is used to define damage parameter and its evolution. The shockinduced experiments are done using planar impact technique on the one - bench light gas gun, and the ultrasonic tests in the damaged rocks have been measured by use of the ultrasonic pulse -transmission method. The results show that the shock - induced damage of rock are related with the shock speed and the attenuation coefficient alpha of sonic wave, and the later reflect the damage degree in rock fairly authentic. Thus the attenuation coefficient a can be used as main damage parameter for constructing damage model of rock under dynamic loading. Blasting simulating example indicates that the calculation method based on new models can satisfy the need of engineering practice.