不同加载刚度下煤体冲击倾向性测试及评价指数分析

doi:10.13722/j.cnki.jrme.2023.0046

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Abstract Coal burst is an engineering dynamic failure of roof and sidewall system. The research of sidewall bursting failure under the action of roof is more suitable for in-situ geological and engineering conditions in coal mining. By using the developed multi-level changeable stiffness loading test device，the test results of coal bursting liability index under different loading stiffness of the test device were studied. According to the energy supply burst characterization model of the roadway surrounding rock，the bursting energy supply index for bursting risk evaluation was proposed. The results show that with the decrease of the device-specimen stiffness ratio，the post-peak failure velocity of coal is accelerated，and the failure mode of coal is transformed from block cracking and peeling to fragment ejection. The fragment fractal dimension and fracture degree of specimens increase. Testing value of the uniaxial compressive strength and elastic strain energy index have little correlation with the stiffness ratio. The duration of dynamic fracture is positively correlated with the stiffness ratio in a power function，while the bursting energy index is negatively correlated with the stiffness ratio in a power function. The roof supply energy，together with the coal released elastic energy，is an important cause of coal burst. With the decrease of roof-sidewall stiffness ratio，the roof supply energy increases，and the coal bursts more easily. The proposed bursting energy supply index can be used as an important indicator to evaluate coal burst risk under different roof and sidewall stiffness conditions.

Key words： mining engineering coal burst stiffness theory bursting liability burst risk roof stiffness coal sidewall

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	Articles by authors
	YIN Yanchun1
	ZHAO Tongbin1
	LI Haitao2
	TANG Xingxue1
	3
	ZHU Yuanhui1

Cite this article:

YIN Yanchun1,ZHAO Tongbin1,LI Haitao2, et al. Bursting liability test and evaluation index analysis of coal under different loading stiffnesses[J]. , 2023, 42(12): 2982-2992.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2023.0046 OR https://rockmech.whrsm.ac.cn/EN/Y2023/V42/I12/2982

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