面层混凝土对跑道内爆毁伤影响的仿真研究

Numerical Simulation on the Effect of Surface Concrete Layer on Inner Explosion of Runway

采用考虑混凝土拉伸破坏的TCK失效模型,运用AUTODYN软件对跑道内爆毁伤进行了数值模拟。研究了炸点置于面层混凝土底部时,不同装药量和不同面层混凝土厚度对爆破漏斗坑参数的影响规律。结果表明:数值模拟结果较好地反映了混凝土因拉伸损伤引起的破裂和抛掷漏斗现象。基于数值模拟得到的漏斗坑参数值,建立了漏斗坑半径、空腔半径与面层厚度的无量纲表达式,计算得到的漏斗坑参数值得到了实验验证。

The explosion damage of runway is numerical simulated using a hydro code of AUTODYN based on TCK damage model considering tensile failure. The effects of charge and surface concrete layer thickness on the explosion crater diameter are obtained when the detonation is at the bottom of surface concrete layer. The results indicate that the model describes well the process of concrete fracture and crater formation in surface concrete. According to the simulation results, the dimensionless expression relating crater radius, cavity radius and the thickness of the surface concrete layer is established to predict the crater parameters during inner explosion in runway. A good agreement is achieved between the crater sizes measured by experiment and that predicted using this empirical equation.