Abstract
CO2 gas explosion is an important technology for coal seam permeability enhancement and fracturing, but the stage division of its life cycle is unclear, and research on the use of radial vibration characteristic parameters for stage division is lacking. To more accurately divide each stage of the life cycle and analyse the characteristics of each stage, a radial vibration mechanical model of CO2 gas explosion was constructed. A novel radial vibration laboratory test of a briquette under CO2 gas explosion was designed and conducted, and the characteristic parameters, such as the explosion radial vibration signal waveform, peak acceleration, velocity, and peak energy, were quantitatively analysed. The results show that there were three stages in the life cycle of a coal briquette under the action of a CO2 gas explosion. The first stage, from 0 to 1.507 ms, was the stress wave action stage, in which the peak acceleration and peak energy around the blasthole were 25.460 g and 9.480 × 1012 (m/s)2, respectively. The second stage, from 1.507 ms to 9.282 ms, was the CO2 gas explosion energy storage stage, in which the peak acceleration and peak energy around the blasthole were 1.478 g and 5.524 × 107 (m/s)2, respectively. The third stage, from 9.282 ms to 12.606 ms, was the CO2 splitting stage, in which the peak acceleration and peak energy around the blasthole were 6.527 g and 1.470 × 109 (m/s)2, respectively. The research results analysed after the CO2 gas explosion verify the promotion of gas splitting in the second and third stages, explain the evolution mechanism of radial vibration in each stage of CO2 explosion, and provide a theoretical basis for the optimal design of CO2 explosion technology.
Published Version
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