坚硬顶板破断步距影响下煤体采动力学响应及压裂防冲分段长度优化

doi:10.3724/1000-6915.jrme.2025.0829

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Abstract The large-area hanging hard roof is prone to concentrated energy release, making it crucial to control the reasonable breaking step of the roof through subsection hydraulic fracturing to prevent rock bursts. This paper employs theoretical analysis, mechanical testing, numerical calculations, and field tests to examine the characteristics of mining stress influenced by various roof breaking steps. A method for determining the broken chain size during segmented fracturing under mining conditions is established, alongside a reasonable determination of segment length and its field application. The results indicate that the peak mining stress increases with mining activity under the same periodic breaking step of the roof at the working face. Furthermore, the peak mining stress rises with increasing periodic breaking distance across different breaking steps. As the roof breaking step increases, the loading and unloading amplitude of coal samples subjected to the mining stress path also increases, leading to a rise in cumulative acoustic emission energy, which facilitates the instability and failure of coal samples. By analyzing the failure of coal samples and the loading-unloading response ratio in relation to periodic breaking step mining, it is determined that coal samples subjected to a mining stress path with a 32.0 m periodic breaking step can be classified as impact coal samples. The numerical calculation suggests that a segment length of 30 m effectively mitigates the interference between adjacent cracks, resulting in a flatter crack propagation form, while maintaining a relatively small remaining interval between adjacent cracks. Field tests have effectively validated that the segmented length enables controllable energy release. Notably, the single-day microseismic frequency after fracturing increased by 52.0% compared to pre-fracturing levels, while the proportion of high-energy events significantly decreased, with high-energy events exceeding 104 J being effectively eliminated. These research findings provide a reference for the prevention and control of rock bursts in coal mines under similar geological conditions.

Key words： mining engineering rock burst hard roof mining stress hydraulic fracturing segment length

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	Articles by authors
	JIA Chong1
	2
	LAI Xingping1
	2*
	CUI Feng1
	2
	3
	4
	WU Xueming5
	JI Songtao1
	2
	HE Zhe1
	2
	WANG Hao1
	ZONG Cheng1
	ZHANG Bo1
	XUE Yifei1

Cite this article:

JIA Chong1,2,LAI Xingping1, et al. Dynamic response of coal mining under the influence of hard roof breaking step and optimization of fracturing and scour prevention section length[J]. , 2026, 45(6): 1806-1826.

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https://rockmech.whrsm.ac.cn/EN/10.3724/1000-6915.jrme.2025.0829 OR https://rockmech.whrsm.ac.cn/EN/Y2026/V45/I6/1806

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