Deformation characteristics of coal samples during entire process of gas migration under triaxial stress conditions

doi:10.16265/j.cnki.issn1003-3033.2026.08.1534

Abstract

Abstract:

To reveal the coupling relationship between gas migration and coal deformation during the development of coal-gas dynamic disasters, full-process deformation tests covering gas adsorption, desorption and seepage were carried out on various coal samples. The correlation between the deformation characteristics of coal mass throughout gas migration and triaxial stress conditions was systematically analyzed, and the effects of gas pressure and axial stress on coal deformation were clarified. The results show that the temporal evolution characteristics of gas adsorption-induced deformation and gas seepage-induced deformation are highly consistent and both present a trend of rapid growth in the initial stage, slow growth in the middle stage and relative stabilization in the final stage. Gas desorption-induced deformation of coal mass follows a trend of rapid decay in the initial stage, slow decay in the middle stage and relative stabilization in the final stage. Gas pressure promotes the whole process of coal deformation induced by gas adsorption-desorption-seepage, while axial stress exerts an inhibitory effect. The influence of gas pressure on coal deformation is more significant than that of axial stress. For coal masses with poor pore connectivity, the time for deformation to reach relative stabilization is significantly prolonged, whereas coal masses with favorable pore connectivity are more sensitive to gas pressure and axial stress.

Key words: triaxial stress conditions, gas migration, deformation characteristics, adsorption-desorption-seepage, gas pressure, axial stress

CLC Number:

X936

Kong Xiangguo, Yun Zehao, Lin Haifei, Ji Pengfei, He Di, Yang Songrui. Deformation characteristics of coal samples during entire process of gas migration under triaxial stress conditions[J]. China Safety Science Journal, 2026, 36(8): 84-94.

Figures/Tables 11

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