The formulation and evolution of blast-induced cracks in rock are simulated by .ANSYS/LS-DYNA programs. Based on dynamical characteristics of hornstone and Von Mises failure criteria of rock-like materials

the sizes of crushing zone and fracture area are obtained. The mechanism of crack formulation in rock blasting is also analyzed; and attenuation characteristics of maximum pressure are also given. It is found that the radius of crushing zone in rock is approximately 6.5 times of the cylindrical charge

while the radius of fracture area is approximately 75 times of the cylindrical charge. The crushing zone forming process is rapid

lasting nearly 80 μs

but the fracturing zone process host long time. After crushing zone formed

tangential fractures will appear around.