Dead-Pressing Phenomenon in an ANFO Explosive

摘要

The dead-pressing phenomenon or pressure desensitization in ANFO as well as inother civil explosives is well-known. However, to our knowledge, the detailed study of the phenomenon in ANFO has not been carried out nor has it been reported. Therefore, such a study was planned in SveDeFo's long range research program. Blasting experiments in iron pipes were performed. Mainly, the density of dead-pressing and the transmission distance of detonation in the dead-pressed ANFO (Prillit A) were studied. The results show that the density of dead-pressing of the tested ANFO, Prillit A, in diameter 45, 60 and 75 mm iron pipes is respectively 1.35, 1.39 and 1.43 g/cu cm. The dependence of the detonation transmission distance on the density of ANFO has been investigated. The computer program AUTODYN has also been used to simulate the dynamic process of ANFO being compressed by a constant pressure. In the report, the experiments and the computer simulation will be described and the results will be stated.