Some Problems in Underground Protection Engineering Against Hypervelocity Long-Rod Kinetic Projectiles

Abstract:

Aimed at the cratering similarity of hypervelocity penetration， the relationship between the crater and the coupled ground shock energy， and the calculation method of the equivalent explosive yield， the similarity law of penetration crater is clarified and the formula of the ground shock energy based on crater volume is established. The relationship between the ground shock efficiency and the projectile kinetic energy， the length-diameter ratio of the projectile， and the material characteristics is obtained. The calculation methods for the equivalent yield of the penetration ground shock and the thickness of the safety protective layer are proposed. The results show that there is a scale effect in the volume of the penetration damage zone， which is proportional to the fourth power of the projectile radius， and that when other conditions remain unchanged， the ground shock energy efficiency increases with the increase of projectile mass， and decreases with the increase of projectile length-diameter ratio and density.