干旱区生态环境知识资源中心(Arid): Damage law and mechanism of coal-rock joint structure induced by liquid nitrogen at low temperature

Arid

DOI	10.1038/s41598-022-15185-8
	Damage law and mechanism of coal-rock joint structure induced by liquid nitrogen at low temperature
	Li, Hewan; Sun, Siyang; Wang, Laigui; Liu, Jian; Zhang, Ziheng
通讯作者	Sun, SY
来源期刊	SCIENTIFIC REPORTS
ISSN	2045-2322
出版年	2022
卷号	12 期号:1
英文摘要	The width and degree of connectivity of coal-rock joints directly affect the seepage capacity of flow energy such as gas. To study the damage law and mechanism of the coal-rock joint structure under the action of liquid nitrogen, two methods of liquid nitrogen unloaded and liquid nitrogen freeze-thaw were used to carry out damage modification experiments on coal-rock with different water saturation. Using OLS4000 laser confocal microscope and MH-25 universal testing machine to conduct electron microscope scanning and uniaxial compression test, measure the joint width expansions and Young's modulus of the coal-rock surface before and after the test, establish a physical and mechanical model of freeze-thaw damage to analyze the ice-wedge expansion stress influence on the damage of coal-rock joint structure and establish damage criterion. The research results show that the ice-wedge expansion stress, confining pressure, and temperature stress in the joint jointly affect the structural damage of coal-rock joints, and the ice-wedge expansion stress contributes the most. With the increase of water saturation, the damage to the coal-rock joint structure intensifies, and the ice-wedge expansion stress under the water saturation state has the most obvious influence on the damage to the coal-rock joint structure. The damage criterion constructed by the freeze-thaw damage physical-mechanical model can reveal the damage mechanism of the effect of ice-wedge expansion stress on the coal-rock joint structure. This paper has certain practical significance for the safety and stability evaluation of rock engineering in cold and arid regions and provides new ideas for effectively extracting clean energy such as coalbed methane and preventing rock bursts.
类型	Article
语种	英语
开放获取类型	Green Published, gold
收录类别	SCI-E
WOS记录号	WOS:000819039200029
WOS关键词	GRIFFITH THEORY ; LOCALIZATION ; FEASIBILITY ; EVOLUTION ; CONCRETE
WOS类目	Multidisciplinary Sciences
WOS研究方向	Science & Technology - Other Topics
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/394447
推荐引用方式 GB/T 7714	Li, Hewan,Sun, Siyang,Wang, Laigui,et al. Damage law and mechanism of coal-rock joint structure induced by liquid nitrogen at low temperature[J],2022,12(1).
APA	Li, Hewan,Sun, Siyang,Wang, Laigui,Liu, Jian,&Zhang, Ziheng.(2022).Damage law and mechanism of coal-rock joint structure induced by liquid nitrogen at low temperature.SCIENTIFIC REPORTS,12(1).
MLA	Li, Hewan,et al."Damage law and mechanism of coal-rock joint structure induced by liquid nitrogen at low temperature".SCIENTIFIC REPORTS 12.1(2022).