A study on the explosive features of coal-mining powder No3 in tube

For coal mines with coal-dust, grisou explosiveness and other potential dangers, security production must be guaranteed not only by applying security explosives of relevent grade, but also by taking into the account of explosive features in the filling of explosives in bore hole Under the theory of detonation of explosives, Some experiments on No3 explosive are carried out with electroprobe method. The test results indicate the explosive's stable blasting length in tube (or bore hole) is about 0.8m when its decoupling coefficient ranges from 1.2 to 1.5 (in production application). In other words, if the consecutive filling of explosives is beyond the length, anti-blasting or deflagration may occur.