不同种类煤岩碎块弹射特征及冲击动能指数测试

doi:10.3724/1000-6915.jrme.2025.0060

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Abstract During the dynamic failure of coal and rock, a significant number of fragments are ejected, and the ejection distance and kinetic energy of these fragments can more intuitively reflect the intensity of the specimen?s failure. This paper proposes a method for measuring the ejection kinetic energy of coal and rock fragments, with its feasibility verified through numerical simulation examples. Experimental research is conducted on the ejection characteristics of fragments from different types of rocks. Based on these findings, a classification method for burst liability is proposed, utilizing the burst kinetic energy index. Furthermore, the influence of loading stiffness on the ejection characteristics of fragments and the burst kinetic energy index of coal is analyzed. The results indicate that the ejection characteristics of coal and rock specimens vary significantly among different lithologies. The ejection mass proportion and distance of fragments from granite and basalt are notably greater than those from sandstone, marble, and coal, which exhibit lower strength. The stronger the burst liability of the specimen, the greater the ejection distance and kinetic energy of the fragments. The ejection kinetic energy of the fragments shows a positive power function relationship with uniaxial compressive strength, and a positive linear relationship with both the burst energy index and the residual elastic energy index. The recommended ranges for the burst kinetic energy index are as follows: for coal with no burst liability, less than 30 J/m3; for weak burst liability, 30 to 300 J/m3; and for strong burst liability, greater than 300 J/m3. As the stiffness ratio of the testing machine to the specimen decreases, the energy supplied by the testing machine to the coal specimen increases, resulting in an increase in both the ejection distance and kinetic energy of the fragments after failure. The burst kinetic energy index exhibits a positive power function relationship with the stiffness ratio. The proposed method for measuring the ejection kinetic energy of specimen fragments and the burst kinetic energy index can effectively evaluate the burst liability and damage intensity of coal specimens.

Key words： mining engineering coal burst fragments ejection burst kinetic energy burst liability loading stiffness

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	Articles by authors
	ZHAO Tongbin1
	2
	GUO Lei1
	2
	YIN Yanchun1
	2
	XIAO Yaxun3
	LI Shihang1
	2
	GAO Zitong1
	2

Cite this article:

ZHAO Tongbin1,2,GUO Lei1, et al. Testing of fragments ejection characteristics and burst kinetic energy index for different types of coal and rock[J]. , 2025, 44(7): 1709-1719.

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https://rockmech.whrsm.ac.cn/EN/10.3724/1000-6915.jrme.2025.0060 OR https://rockmech.whrsm.ac.cn/EN/Y2025/V44/I7/1709

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