Ejection behavior of concrete materials under cast blasting

The ejection velocity of fragmented concrete mass formed in the cast blasting was studied with the method of dimensional analysis and numerical simulation. The influence factors of casting velocity was analyzed, and function expression of casting velocity with charge mass and depth of burial as independent variable was derived by dimensional analysis. Average ejection velocity was defined according to the distribution of the fragmented concrete mass. Ejection velocity varies from different charge mass and depth of burial was simulated by SPH using AUTODYN-2 code. With the simulation results, the semi-empirical formula for ejection velocity was fitted. The significance testing for the semi-empirical formula was conducted. And the results show that the confidence level is more than 0.99, and the accuracy of this formula fully meet the engineering requirements.