含瓦斯煤循环冲击动力学特性与裂隙扩展特征

doi:10.13722/j.cnki.jrme.2023.0165

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Abstract In order to explore the cyclic impact dynamic characteristics and crack propagation law of coal under different initial gas pressures，the cyclic impact test of coal under different initial gas pressures is carried out by using the combined dynamic and dynamic loading test system of coal-rock containing gas，and the dynamic stress-strain curve of gas-bearing coal under cyclic impact load is obtained. The relationship between coal dynamic parameters and initial gas pressure under cyclic impact is analyzed，3D visualization and fine quantitative characterization of crack propagation process before and after cyclic impact of gas-bearing coal are realized by CT scanning technology. The results show that：(1) the dynamic stress-strain curves of gas-bearing coal under cyclic impact load are basically similar，which are divided into three stages：linear elastic stage，plastic stage and unloading stage. The dynamic parameters of coal under impact load decrease with the increase of the initial gas pressure，and the greater the initial gas pressure，the stronger the gas weakening erosion effect. (2) Based on the fracture slices extracted by CT scanning and the reconstructed 3D fracture results，it is shown that annular parallel cracks and axial splitting through cracks exist in the impinged coal. The crack propagation process can be effectively and quantitatively characterized by two-dimensional and three-dimensional fracture characteristic parameters of gas-bearing coal，and the characteristic parameters are proportional to the initial gas pressure. Under high gas pressure environment，the fracture network in coal body is more complex，the connectivity is higher，and the instability failure is more likely to occur. (3) Based on theoretical analysis，the causes of strength damage and deterioration of coal body are revealed from the perspective of gas erosion and internal stress wave propagation of coal body. Combined with the damage effect of gas and dynamic load on coal body，the causes of strapping failure of cyclic impact coal body under the action of gas are discussed. The research results are helpful to enrich the dynamic theory of gas-bearing coal and have a certain theoretical reference significance for the prevention and warning of coal and gas outburst disaster in mine.

Key words： mining engineering gas-bearing coal cyclic impact dynamic characteristics CT scan crack propagation

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	Articles by authors
	WANG Lei1
	WANG Ancheng1
	CHEN Lipeng1
	LI Shaobo1
	LIU Huaiqian2

Cite this article:

WANG Lei1,WANG Ancheng1,CHEN Lipeng1, et al. Dynamic characteristics and crack propagation characteristics of gas-bearing coal under cyclic impact[J]. , 2023, 42(11): 2628-2642.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2023.0165 OR http://rockmech.whrsm.ac.cn/EN/Y2023/V42/I11/2628

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