Numerical Simulation on Jointed and Fractured Rock Blasting

The joints in rock influence the stress wave propagation behavior and the blasting effects.According to the character of rock with closed macro fractures,the features of stress wave propagation in the rock with one joint,two parallel joints or two cross joints were simulated by LS—DYNA with 3DEC.The simulation results show that the stress wave distributed non-uniformly in bench blasting and most of which spread toward free surface.The minimum principal stress reduced quickly with the fractures increasing,especially on the case of two crossing fractures,the tensile stress near the hole reduced about 30 percent.