Numerical simulations on influences of explosive properties on rock particle movement

The explosion processes of spherical PETN charges in Lantian granite were numerically simulated by using the software AUTODYN. Particle velocity and displacement curves at different locations in Lantian granite were obtained and the influences of explosive properties on rock particle movement were qualitatively analyzed. The simulated particle velocity and displacement are consistent with the existent experimental results. There lies a large distinction between particle velocity peaks from simulation and experiment, but the error of particle displacement peak is less than twenty percent, of which influenced by velocity peak, pulse duration, rise time and velocity attenuation. In the case of the same explosion energy, the rock particle velocity peaks induced by the explosion of the HMX, PETN, and TNT charges in Lantian granite decrease in turn. But the particle displacement peak induced by the explosion of the TNT charge is the biggest, the particle displacement peak induced by the explosion of the PETN charge is the least. The reaction rate of non-ideal explosive has an obvious effect on the particle velocity and displacement peaks which increase with the increasing of the reaction rate.