Fracture structure and dynamic characteristics of coal after various soaking times with supercritical CO₂.

IF 4.1 3区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Annals of the New York Academy of Sciences Pub Date : 2025-06-10 DOI:10.1111/nyas.15377

Kang Jin, Lei Wang, Zhenyu Yang, Lipeng Chen, Zhipeng Liao, Yuxuan Wu, Weili Li

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Abstract

Current research on the mechanical properties and damage of coal after supercritical CO₂ (sCO₂) soaking has focused on static investigations. To understand the dynamic characteristics, researchers often analyze the parameters characterizing the fracture and three-dimensional strain fields of coal before and after sCO₂ soaking. We explored the relationship between the time-dependent damage to coal and the deterioration of dynamic parameters. The damage variable was defined by the increase in fracture volume, while a dynamic damage constitutive model of coal was established for various sCO₂ soaking durations. Soaking initiated and expanded coal pore fractures and altered strain variables in the coal matrix. The fracture volume and fractal dimension of the coal increased with soaking time, whereas the strain area expanded. After sCO₂ soaking, the dynamic peak strength and elastic modulus of coal displayed time-dependent decreases. The damage variable was positively correlated with soaking time.

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超临界CO2不同浸泡时间煤的断裂结构及动态特性

目前对超临界CO2 （sCO2）浸泡后煤的力学性能和损伤的研究主要集中在静态研究上。为了了解煤的动态特性，研究人员经常对煤在sCO2浸泡前后的断裂参数和三维应变场进行分析。探讨了煤的时效损伤与动力参数劣化的关系。将损伤变量定义为裂缝体积的增加，建立不同sCO2浸泡时间下煤的动态损伤本构模型。浸水引发和扩大了煤孔隙裂缝，改变了煤基质中的应变变量。随着保温时间的延长，煤的裂隙体积和分形维数增大，应变面积增大。煤经sCO2浸泡后，煤的动态峰值强度和弹性模量随时间减小。损伤变量与浸泡时间呈正相关。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Annals of the New York Academy of Sciences 综合性期刊-综合性期刊

CiteScore

11.00

自引率

1.90%

发文量

193

审稿时长

2-4 weeks

期刊介绍： Published on behalf of the New York Academy of Sciences, Annals of the New York Academy of Sciences provides multidisciplinary perspectives on research of current scientific interest with far-reaching implications for the wider scientific community and society at large. Each special issue assembles the best thinking of key contributors to a field of investigation at a time when emerging developments offer the promise of new insight. Individually themed, Annals special issues stimulate new ways to think about science by providing a neutral forum for discourse—within and across many institutions and fields.