Research On Energy Control Mechanism Of The Directional Fracture Blasting With Split-tube Charge Holders

Underwater explosion experiments about blast wave of different-structure split-tube charge holders are carried out, obtained pressure wave profile of split-tube charge holder in underwater explosion device. Analyze blast wave signal of split-tube charge holder in detail, obtained shock wave specific energy and balst gas bubble pusatile specific energy of split-tube charge holder. Using ultr-dynamic strain meaument method to split-tube charge holder blasting in granite rock, obtained blasting strain wave profiles of slit direction and perpendicular to slit direction of split-tube charge holder in granite rock. Obtained particle velocity in granites from deduced the blasting strain wave parameter.Using two dimensional elastic-plastic fluid dynamic finite difference method to compute the whole blasting process of split-tube charge holder. RHT and JH-2 constitutive function are applied to simulation blasting dynamic behavior of split-tube charge holder.Analyze balsting damaged fracture mechanism of split-tube charge holder by ultrasonic testing.Split-tube charge holder directional fracture blasting essences are explained by experimental data.