中国矿山工程

With the continuous development of science and technology, digital electronic detonators can achieve arbitrary ms settings. This paper studies the stress distribution law of delayed blasting in conjunction with shock wave theory, numerical simulation and field test methods. Theoretical calculation shows that there are more free surfaces created by delaying 3-8ms, and the blasting effect is the best. Subsequently, with the help of ANSYS finite element, a delayed blasting model in a bench hole with a height of 26m was established. Based on the energy attenuation of the shock wave acting on the rock at different air spacings at different times, the law of stress distribution after detonation was studied. The results show that by delaying the detonation in the hole by 3ms, and the energy decays slowly, which plays a good role in energy storage and buffering; The stress diffusion range in the rock mass is large, the time to reach the rock breaking strength is long, and the stress peak value decays slowly. Finally, the theoretical research results are applied to the field for confirmation.