Investigations into the Rock Dynamic Response under Blasting Load by an Improved DDA Approach

Evaluation of blasting-induced rock damage and fragmentation is very important for safety control construction in the jointed mass. The discontinuous numerical models are commonly applied due to advantages modeling treating discontinuities. In this paper, fracturing algorithm rate dependent strength law incorporated into deformation analysis (DDA) study wave propagation phenomena dynamic problems. By reproducing Hopkinson pressure bar tests under different loading rates, improved method validated be capable solving failure problem. Finally, taking Xiucun tunnel as an example, its process action explosive simulated, some features captured. addition, explosion induced particle vibration surrounding studied. reasonable simulation results indicate that modified DDA can effectively model stress joint growth blasting load.