Abstract：The new parameters for describing damage and it s evolution in rock are explored to const ruct damage model of rock f ragmentation by blasting. The shock2induced damage experiment s are carried out and the ult rasonic signals in the damaged rocks are measured. The result s show that the shock2induced damage of rock is related to the attenuation coefficient of sonic wave. Considering the relationship of the attenuation of wave and damage ener2 gy dissipation , a new rock damage model is developed for rock blasting. Comparing the experiment data of light2 gas gun with the simulating result s by the new models , it is verified that the new model can better reveal the dy2 namic course of rock f ragmentation by blasting.
