Analysis of explosion wave interactions and rock breaking effects during dual initiation  

作　　者：Renshu Yang Jinjing Zuo Liwei Ma Yong Zhao Zhen Liu Quanmin Xie 

机构地区：[1]School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China [2]Research Institute of Macro-Safety Science,University of Science and Technology Beijing,Beijing 100083,China [3]State Key Laboratory of Precision Blasting,Jianghan University,Wuhan 430056,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2024年第8期1788-1798,共11页矿物冶金与材料学报（英文版）

基　　金：This research was financially supported by the National Natural Science Foundation of China(Nos.52208384 and 51934001);the National Key Research and Development Program of China(No.2021YFB3401501);the State Key Laboratory of Precision Blasting and Hubei Key Laboratory of Blasting Engineering,Jianghan University(No.PBSKL2022C05).

摘　　要：In blasting engineering, the location and number of detonation points, to a certain degree, regulate the propagation direction ofthe explosion stress wave and blasting effect. Herein, we examine the explosion wave field and rock breaking effect in terms of shockwave collision, stress change of the blast hole wall in the collision zone, and crack propagation in the collision zone. The produced shockwave on the collision surface has an intensity surpassing the sum of the intensities of the two colliding explosion shock waves. At the collisionlocation, the kinetic energy is transformed into potential energy with a reduction in particle velocity at the wave front and the wavefront pressure increases. The expansion form of the superposed shock wave is dumbbell-shaped, the shock wave velocity in the collisionarea is greater than the radial shock wave velocity, and the average propagation angle of the explosion shock waves is approximately 60°.Accordingly, a fitted relationship between blast hole wall stress and explosion wave propagation angle in the superposition area is plotted.Under the experimental conditions, the superimposed explosion wave stress of the blast hole wall is approximately 1.73 times the singleexplosionwave incident stress. The results of the model test and numerical simulations reveal that large-scale radial fracture cracks weregenerated on the blast hole wall in the superimposed area, and the width of the crack increased. The width of the large-scale radial fracturecracks formed by a strong impact is approximately 5% of the blast hole length. According to the characteristics of blast hole wallcompression, the mean peak pressures of the strongly superimposed area are approximately 1.48 and 1.84 times those of the weakly superimposedand nonsuperimposed areas, respectively.

关 键 词：BLASTING shock wave collision high-speed schlieren system crack fracture characteristic explosion wave 

分 类 号：TD235[矿业工程—矿井建设]