Statistical Damage Constitutive Model of Gas-Bearing Coal with Consideration to Crack Deformation
Publication: Journal of Energy Engineering
Volume 148, Issue 1
Abstract
Coal is a complex porous medium. When gas exists in the coal body, the fissure structure of coal and the occurrence of gas adsorption make the stress state of gas-bearing coal different from that of ordinary coal. Therefore, the stress state of gas-bearing coal cannot be accurately described by the Terzaghi effective stress, which ignores the effects of crack deformation and methane. To improve the accuracy of gas-bearing coal analysis, this study considered the corrosive effect of free gas and adsorbed gas and the crack closure effect to establish a novel statistical damage constitutive model with consideration to the combined effects of free gas, adsorbed gas, and coal cracking. The established model was used to elucidate the effects of gas-bearing coal on the coal’s mechanical deformation and damage characteristics under different stress conditions. The model was validated through full stress–strain experiments on gas-bearing coal under different axial pressure and gas pressure. The results obtained by the proposed statistical damage constitutive model can better describe the stress state of the gas-bearing coal, particularly in the initial stage of void compaction, and are in good agreement with the experimental data. The proposed model provides the theoretical foundation for future studies on the characteristic mechanism of gas-bearing coal.
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Data Availability Statement
All data, models, and code generated or used during this study are presented in the published article.
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Published In
Journal of Energy Engineering
Volume 148 • Issue 1 • February 2022
Copyright
© 2021 American Society of Civil Engineers.
History
Received: May 6, 2021
Accepted: Oct 28, 2021
Published online: Dec 9, 2021
Published in print: Feb 1, 2022
Discussion open until: May 9, 2022
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