Abstract:

Aiming at safety of electric detonator about identification of misfire in chamber blasting by Frequency Division Multiple Access Method，doing experiments and test induced current about electric blasting network combing the theory and two single generation in the case of different power，distance and inductive area. Analyzing the change trend of current，the result showed that：（1）Detonators are safe under working state of two single generation when inductive area of electric blasting network is less than or equal to 0.5 m².（2）Detonators are explosive when inductive area of electric blasting network and single generation is 1.32 m²，0.78 m²，and their position is coincide.（3）Electric detonators are detonated when area of electric blasting network is bigger than 0.5 m²，and position of electric blasting network and single generation is coincide.By analyziny the test， the results show that when power of single generation less than or equal to 120 W and inductive area of electric blasting network is less than 0.5 m²，electric detonators are safe.

Key words: chamber blasting, misfire identification, Frequency Division Multiple Access, safety of electric detonator