Research on optimization of radial uncoupled charge parameters based on the mechanical characteristics of step-type partitioning
Year: 2026
Type: article
Abstract: To investigate the influence mechanism of a radial uncoupled charge structure using mixed emulsion explosives on the blasting fines generation rate, a typical granite mine was selected as the research case. a systematic study was conducted by integrating theoretical analysis, transparent tube simulations, and on-site industrial trials. First, by comparing coupled and uncoupled charges, we demonstrate the advantage of radially uncoupled charges in achieving peak detonation stress attenuation and uniform energy release through the annular gap. Second, variable-diameter radial decoupled spaced sinking charge simulations were conducted to optimize spacer installation and isolation measures. Finally, field trials were carried out on a weakly weathered (+ 30 m) and a moderately weathered (+ 45 m) granite bench within the same mine, where different decoupling coefficient schemes were applied to the upper, middle, and lower sections of bench-zoned areas and compared with traditional rock-slag spacers and continuous charging. Results show that in weakly to moderately weathered granite, this radially uncoupled configuration-with a 125 mm bottom charge and 110 mm middle/upper spacers-reduces unit explosive consumption by over 16%, yields a uniform block size distribution, lowers fines generation, and produces a moderately loose muckpile favorable for subsequent excavation and loading. This proposed structure effectively controls the pulverization rate in granite blasting, offering a technical reference for similar granite quarries.
Source: Scientific Reports
Authors: Tao Wang, Gao-feng Ren, Zhen Wang, Pu-lin Kang
Language: English
Topic: Blasting Impact and Analysis
Subfield: Building and Construction
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,690
Award: G3471671846
OpenAlex ID: W7166547441