Influence of Rock Layer Thickness on the Penetration Resistance of a Composite Target

Abstract To describe the influence of rock thickness on penetration resistance rock-concrete composite targets, a three-dimensional model was simulated using nonlinear dynamic simulation software LS-DYNA. The four targets with thicknesses 10-20, 20-20 cm, 30-20 and 40-20 cm by projectile at target angle 75 degrees is investigated in this study. A damage cloud diagram plate obtained, curves speed overload X Y directions time are analysed. During penetration, concrete layers tend to restrain each other from destroying target’s back surface, directly enters tunnel area layer layer. When ratio shot length less than 1.5, attitude after penetrating relatively stable.