Numerical simulation on the effect of surface concrete layer on inner explosion of runway

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.