Study On The Mechanism Of Short-delay Controlled Blasting In The Air And The Experiment On Door-explosion In The Antiterrorism

When the antiterrorist personnel rescue the hostage or capture the terrorist, they often need the explosive to blast out the door or the wall in order to open a fast channels. The antiterrorist personnel commonly set off the explosive by the method of the concentrated charge or the multi-spot explosion. The overpressure value of the blast wave of these two methods is very high, which easily result in the unnecessary damage of the antiterrorist personnel.This article takes use of the method of the multi-spot short-delay to control the door-explosion, which can reduce the peak value of the overpressure of shock-wave, in order to avoid the injury to the antiterrorist personnel effectively. The weak placees of the door are usually the core and the hinge, but along with the enhancement of quality and technology of the burglarproof door, it is not easy to blast out the door through these two weaknesses in a small explosive. By the research, the author founds the burglarproof door's expansion bolt could be considered as the weakness in the explosion to be researched.This article mainly includes two parts, the simulation part and the experiment part. Through simulation of the short-delay controlled blasting of the simple point, two points and six points, the author gets the mechanism of the short-delay controlled blasting, then designs two methods of the time-delay blasting:one takes use of the detonator's own time-delay characteristic to control blasting, the other one takes advantage of the length of detonator's nonel to control blasting. The experimental results under the different charges have confirmed the mechanism of the short-delay controlled blasting. According to the results under the two different methods, the strongpoint and disadvantage of the methods and the best dosage in the blasting are conducted in the article. According to the overpressure value of the blast wave in experiments, the author calculates the safe distance for the antiterrorist personnel.