机场跑道复合介质的侵彻分析与研究

Analysis and research of penetrating layered target of airport pavement

针对三层复合介质的机场跑道,以球形空腔膨胀理论为基础,并考虑混凝土、碎石、土壤交界面效应,建立了动能侵彻弹侵彻混凝土碎石土壤复合介质的混凝土成坑、混凝土成孔、碎石成孔、土壤成孔四阶段侵彻模型;并采用Runge-Kutta对其控制方程进行了数值求解,得到了各侵彻阶段的剩余速度,并与在单一混凝土介质中侵彻的解进行了比较。理论分析表明:动能侵彻弹在混凝土碎石土壤复合介质中运动时,由于交界面效应,侵彻弹在混凝土层和碎石层中运动时承受的阻力既与动能侵彻弹的质量、侵彻速度、弹形以及相关介质的性质有关,又与侵彻深度有关联,这是与在单一介质中侵彻的最大区别;动能弹在复合介质中运动时的速度大于在单一混凝土介质中的速度,并且随着侵彻深度的增加变得越来越明显。

According to the three-layer airport runway, based on spherical cavity-expansion theory and considering interface effect of concrete/macadam/soil,by analyzing kinetic energy projectile penetrating layered target of concrete/macadam/soil, penetration models of concrete cratering, concrete pore-forming, macadam pore-forming and soil pore-forming are established. In addition, numerical solution of governing equations are carried out by using Runge-Kutta method. And the time-history curve of residual velocity is obtained and the solution is compared with penetration in a single concrete medium. The theoretical analysis shows that because of the interface effect, the penetration resistance of projectile suffered on concrete layer and macadam layer when moving, is related not only to penetration velocity, mass, projectile shape and medium character, but also to penetration depth, which is the biggest difference compared with penetrating into a single layer. Besides, speed of kinetic energy projectile playing in a composite medium is faster than in single concrete medium, and it's more obvious with the increase of the penetration depth.