动载冲击煤样压–拉渐进破坏特征与能量演化试验研究

doi:10.13722/j.cnki.jrme.2024.0005

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Abstract The displacement of layers and mining activities expedite the formation of fractures and spalling in deep coal seams，potentially resulting in dynamic disasters. The dynamic characteristics of coal seams exhibit discrepancies before and after saturation with water，leading to diverse levels of overall instability and failure. To examine the dynamic failure properties of coal samples in natural and saturation states under impact loading conditions，particularly emphasizing the impact of fissure water and goaf water on coal strength at the 61304 working face of Tangjiahu coal mine，split Hopkinson pressure bar(SHPB) tests were carried out on both unaltered coal samples and water-saturated coal samples. The objective of the study was to investigate the variations in displacement，strain，energy dissipation，and degree of fragmentation that occur during the progressive failure of coal samples under dynamic impact loading conditions. The experimental results suggest that：(1) The cracks observed in the coal samples undergo a progressive evolution characterized by four distinct stages：initiation，development，penetration and ultimate failure. The presence of water has a softening effect，causing a deceleration in the length of crack propagation in water-saturated coal samples. However，it leads to an increase in the density of interlaced cracks and the degree of fragmentation. Furthermore，the dynamic compressive strength of coal samples saturated with water is relatively lower in comparison to that of the original coal samples. (2) The energy transformation process of coal samples can be broadly categorized into three stages：compression absorption，absorption dissipation，and energy dissipation. At various impact pressures(0.3，0.5，and 0.7 MPa)，the dissipated energy of the untreated coal specimens rose from 24.13 J to 39.71 J，marking an increment of about 15.58J. In contrast，the dissipated energy of the coal specimens saturated with water escalated from 7.31 J to 31.61 J，showing an increase of approximately 24.3 J. The fluctuation of transmitted energy in the original coal samples remains relatively stable(5.06–6.31 J). In contrast，there is a more significant increase in transmitted energy in water-saturated coal samples，ranging from 1.32 J at 0.30 MPa to 9.39 J at 0.70 MPa. (3) The level of fragmentation observed in coal samples escalates as the pressure rises，manifesting macroscopic features akin to particle and powder fragmentation. The level of fragmentation of coal samples escalates following saturation with water. At lower pressures of 0.3 and 0.5 MPa，minimal disparity exists in the fractal dimensions of coal specimens，irrespective of their water saturation levels. When the pressure is elevated to 0.7 MPa，the fractal dimension of water-saturated coal samples increases by 14.66% compared to that of the original coal samples. Additionally，the particle size exhibits more pronounced fluctuations after fragmentation in comparison to the original coal samples. (4) The experimental investigation into the progressive failure characteristics of coal samples under varying loading rates offers an empirical foundation for estimating the propagation of coal crack extension. The experimental results provide a summary and generalization of the variances in the characteristics of the four indicators pre- and post-saturation with water. These findings offer insights into the fracturing characteristics of coal when subjected to the combined effects of roof rotation and sandstone fissure water at the 61304 working face of Tangjiahu coal mine.

Key words： mining engineering split Hopkinson pressure bar dynamic characteristics energy dissipation digital image correlation method fractal dimension

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	DANG Jiaxin
	TU Min
	ZHANG Xiangyang
	ZHAO Qingchong

Cite this article:

DANG Jiaxin,TU Min,ZHANG Xiangyang, et al. Experimental study on progressive failure characteristics and energy evolution of coal samples under dynamic compression-tension loading[J]. , 2024, 43(10): 2520-2539.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2024.0005 OR https://rockmech.whrsm.ac.cn/EN/Y2024/V43/I10/2520

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