High-Efficiency Cut Blasting with Shell Radial Shaped Charge in Laboratory-Scale Blasting

Abstract

Due to the inefficiency problem of the cut blasting in rock excavation and rock breaking, a shell radial shaped charge device was proposed based of the ideal of ‘cutting to slotting’ and it was validated through experiments. For this device, the shell materials are used to be shaped materials and multiple shaped ring is designed on the circular tube. It can not only reduce charge quantity but also raise the utilization ratio of explosive energy. After explosion, multiple radial shaped charge jets can be formed along the axial line in sequence and then the surrounding rock mass would be cracked. The crack network will be formed along with the further extension of the fraction under the action of quasi static loading of detonation gas. The shell radial shaped charge device was tested through the cut blasting model experiment. Experimental results show that the utilization ratio of blasting hole nearly approaches 98% with this device. The blasting efficiency and cyclical footage can be improved effectively and the cost of drifting can also be reduced.

Theoretical and Numerical Research on V‐Cut Parameters and Auxiliary Cuthole Criterion in Tunnelling

“…Over the years, some innovative methods have been developed for cutting blasting. For example, Chen et al [10] found the shell radial shaped charge effective in cutting blasting, for it can elevate blasting efficiency, boost cyclic advancement, and lower the drifting costs. Combining middle-space charging and toespace charging, Zhang et al [11] noticed that the cutting effect of vertical large-diameter cutholes is enhanced by central large-diameter cuthole, stage-by-stage cutting blasting, and deck toe-space charging.…”

Experimental Study of Bilinear Initiating System Based on Hard Rock Pile Blasting

“…These devices have been widely used in the field of civil blast engineering [10,11]. Chen et al [12] invented a new type of jet cracker to improve the blasting efficiency and the length of cyclical footage. However, when the shaped charge is applied to the hard rock blasting, two disadvantages are observed.…”