4.7 Article

Study on the evolution of pore structure and desorption characteristics of crushed tectonic coals under the different conditions of unloading confining pressure

Journal

POWDER TECHNOLOGY
Volume 426, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.powtec.2023.118681

Keywords

Coal and gas outburst; Tectonic coal; Unloading confining pressure; Pore structure; Desorption characteristics

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The rapid pressure relief has a significant impact on the continuous development of coal and gas outbursts. The particle size distribution, pore structure, and desorption characteristics of crushed tectonic coals under different unloading confining pressure conditions were analyzed. The study found that increasing the unloading speed of confining pressure aggravated the damage of tectonic coals, resulting in an increase in pore volume and gas desorption. These findings suggest that rapid pressure relief conditions provide favorable conditions for the continuous development of coal and gas outbursts.
Rapid pressure relief has an important influence on the continuous development of coal and gas outbursts. The particle size distribution of crushed tectonic coals under the different conditions of unloading confining pressure were analyzed together with the pore structure and desorption characteristics. The overall pore volume and desorption of the crushed tectonic coals were estimated. The results show that the increase of the unloading speed of confining pressure will aggravate the damage of the tectonic coals. With the increase of unloading speed of confining pressure from 0.01 MPa/s to 0.1 MPa/s, the volume of micropore, macropore, and total pore increased by 8.04%-10.62%, 6.92%-8.38%, 7.41%-9.40%, respectively; the gas desorption (in 120 min) increased by 20.56%-25.09% (equilibrium pressure was 0.74 MPa), respectively. This implied that under the rapid pressure relief condition, the damage of tectonic coal, pore structure evolution and unsteady gas gush provided favorable conditions for the continuous development of outbursts.

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