Dynamic test on silt-charge blasting of air-deck charge

In order to study explosive effect of different charge,dynamic response in cement mortar was researched under blasting of air-deck silt-charge using super-dynamic strain test system.The research results show that when air-deck charge is used,the peak strain in the same location within the specimen reduces compared with the continuous charge,and this presents that air column plays a cushion and the role of energy storage;the strain of slit direction weakens faster and the train of slit direction is closer to that of vertical slit direction with the increase of the distance from the hole under slot cartridge blasting;Axial-coupling coefficient between the blasting is better in the 1.5~2.0,and when interval length is too large,strain ratio of slit direction to vertical slit direction has a trend downward,so,directional blasting effect is influenced.The results provide the experimental basis for the actual blasting.