Deformation damage variation law of liquid CO2 cyclic freeze-thaw coal
BAI Gang1, 2, 3*, HE Huixin1, XIN Tianyu1, 2, ZHANG Xiaowen1, 2, ZHOU Zhongjie4
(1. Safety Science and Engineering College, Liaoning Technical University, Huludao, Liaoning 125105, China; 2. Key Laboratory of Mine Thermodynamic Disasters and Control of Ministry of Education, Liaoning Technical University, Huludao, Liaoning 125105, China; 3. Ordos Research Institute, Liaoning Technical University, Ordos, Inner Mongolia 017000, China; 4. China Energy Engineering Group Heilongjiang Electric Power Design Institute Co., Ltd., Harbin, Heilongjiang 150000, China)
Abstract： To investigate the influence of liquid CO2 freeze-thaw cycles on the deformation and damage of coal bodies, a self-developed experimental system for liquid CO2 freeze-thaw cycles was utilized. The deformation and damage characteristics of coal under varying conditions of these cycles were examined. An analysis of the strain variation of the coal body revealed the underlying mechanisms of deformation and damage caused by liquid CO2 freeze-thaw cycles. The results indicate that as the number of freeze-thaw cycles increases from 1 to 12, the axial strain, circumferential strain, and volumetric strain of the coal body exhibit a U-shaped trend, first decreasing and then increasing. Notably, the change in axial strain is slightly greater than the reduction observed in circumferential strain, while volumetric strain shows an overall increasing trend. The relationship between the number of freeze-thaw cycles and the absolute growth rate of the minimum strain is exponential, whereas it increases linearly with the cumulative residual strain of the coal body. Greater numbers of freeze-thaw cycles correlate with higher residual strain, increased expansion and contraction rates, and more pronounced effects on the deformation and damage of the coal body. Furthermore, the permeability of freeze-thaw affected coal is positively correlated with the number of liquid CO2 freeze-thaw cycles. These findings provide valuable insights for optimizing gas extraction technologies using liquid CO2 cyclic freeze-thaw processes and for determining the relevant process parameters for liquid CO2 freeze-thaw cracking.
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2026, Vol. 45 
