The Theoretical And Experimental Research For Blasting Action Of Air Gap Decoupling Charge

Charge structure determines the energy distribution after explosive detonation, which has animportant impact on the blasting effetion. The air gap charge can improve the utilization ofexplosive energy, widely used in the blasting work.On the basis of a large number of researches of domestic and foreign, this paper pointed outthe existing problerm about the present study of the air gap charge. We carried a lot of researchabout the initial pressure of the blast wave and quasi-static pressure of the detonation products,which respectively based on the axial and radial air gap charge of the cylindrical chargeexplosion by the common action rock breaking mechanism of stress wave and the detonationproducts. And we illustrates the causes of the cylindrical wave under the action of the rockcrushing and rupture zone, the energy transfer mechanism of the decoupling charge explosive,establishing the theoretical rock failure model of decoupling charege detonation.We poured the concrete model based on the similarity theory, analysing the effect on rockfragmentation, the shape of the rock pile and the blasting vibration regulation of air layerlocation and proportion by experimental study. The experimental results show that the size of theair layer and proportion have a significant impact on the blast effect, and we will win the bestblast effect while the experiment with the air ratio of45%and decoupling coefficient of1.81.This paper studied the rock damage evolution and the law of the blasting vibration bynumerical simulation software-LS-DYNA program, analysed the explosive energy transfermechanism and conversion-related issues in different charge structure conditions.The calculationresults show thatthe rock breaking mechanism changes with the increase of air ratio,and whenthe air ratio is to40%, the reasons for breaking rock machine pressure to cut into tensile failureto achieve better graded, which indicate that there is a reasonable air improving the utilization ofexplosive energy. When the weak interlayer was located in the middle of blast holes, comparingthe calculation datawith the weak interlayer charge to no weak interlayer charge, it was foundthat, existence of the weak interlayer, the peak compressive stress and tensile stress of the firstmain stress is basically consistent with the no weak interlayer, however, The existence of weakinterlayer interval charge structure in the bottom of the air blast effect was not significant.