冲击扰动对超低摩擦型冲击地压影响分析

doi:10.13722/j.cnki.jrme.2018.0922

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Abstract Under high in-situ stresses and strong excavation disturbance，anomalously low friction effect is prone to occur in deep coal and rock mass，and then results in the anomalously low friction rock burst. A theoretical model was established for anomalously low friction effect of block rock with overburden pressures，and formulas for calculating the normal force between blocks and the horizontal displacement of working blocks were derived based on force analysis of blocks. Theoretical analysis of dynamic responses resulted from vertical and horizontal disturbances was conducted. The distribution of the minimum normal force between blocks，and the influence of the horizontal impact loading frequency and the delay time on the horizontal displacement of the working blocks were investigated. The results show that the position，where the anomalously low friction effect is prone to occur，locates at the three interfaces closest to the vertical impact source. The reduction of the normal force will lead to the reduction of the friction between blocks，and the anomalously low friction type of rock burst is easily caused by horizontal disturbances. When the horizontal impact amplitude is determined，the horizontal motion of the working block exists a specific delay time and a range of horizontal impact frequency. The horizontal displacement exhibits a periodic variation with the delay time and the horizontal impact amplitude. The starting time of the horizontal motion of the working block lags the horizontal impact time. The working block will experience variable acceleration and deceleration motions，and finally be in a stationary state. The variation of the normal force between blocks is the prerequisite for the anomalously low friction effect，and the horizontal disturbance is the main factor causing the horizontal displacement of the working blocks.

Key words： rock mechanics anomalously low friction effect impact loading rock burst block rock normal force horizontal displacement

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	LI Liping1
	LI Weijun1
	PAN Yishan1
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Cite this article:

LI Liping1,LI Weijun1,PAN Yishan1, et al. Influence of impact disturbance on anomalously low friction rock bursts[J]. , 2019, 38(1): 111-120.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2018.0922 OR http://www.rockmech.org/EN/Y2019/V38/I1/111

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