EXPERIMENT ON DYNAMIC DAMAGE PROPERTY OF ROCK AND NEW DAMAGE MODEL FOR ROCK FRAGMENTATION BY BLASTING
Yang Jun, Gao Wenxue, Jin Qiankun (Department of Engineering Safety, Beijing Institute of Technology, Beijing 100081 China)
The new parameters for describing damage and its evolution in rock are explored to construct damage model of rock fragmentation by blasting. The shock induced damage experiments are carried out and the ultrasonic signals in the damaged rocks are measured. The results show that the shock induced damage of rock is related to the attenuation coefficient of sonic wave. Considering the relationship of the attenuation of wave and damage energy dissipation, a new rock damage model is developed for rock blasting. Comparing the experiment data of light gas gun with the simulating results by the new models, it is verified that the new model can better reveal the dynamic course of rock fragmentation by blasting.