基于厚硬岩层运动状态的采场应力转移模型及其应用

doi:10.13722/j.cnki.jrme.2019.1118

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Abstract Theoretical analysis，numerical simulation as well as microseismic monitoring were used to investigate the relationship between the stress transfer of stopes in the mine and the movement of thick and hard rock strata. Firstly，a space model and its balance condition of the semi-closed thick hard rock stratum considering the influence of the horizontal pressure were proposed. Secondly，the overburden state and load transfer law under continuous mining conditions were studied. Finally，the horizontal stress transfer mechanism in the vertical direction of the stope was discussed. The results show that，in the semi-closed stope space model affected by the horizontal stress，the mining process is accompanied by two processes of overburden rupture and stress transfer，and that the different motion states of thick and hard rock are the main reasons for the formation of complex overburden structure and stress evolution. According to different mining environments on both sides of the working face，the longwall panel is divided into five types such as initial mining panel，panel with one side mined up，panel with two sides not fully mined，panel with one side fully mined and the other side not，and panel with two sides fully mined. The types of the static support stress of the corresponding working face are obtained respectively，and the static abutment pressure corresponding to the panel type was achieved. An estimation method of horizontal stress concentration of overlying thick hard rock stratum was established，and the tensile fracture mode of thick and hard rock layer controlled by the horizontal stress and its mechanical expression were obtained. The model was successfully used in the mining practice of longwall panel 5301. The on-site microseismic monitoring results agrees well with the research which can guide the prediction of rockburst. The results have guiding significance for mine disaster prevention and control under similar conditions.

Key words： mining engineering thick and hard rock strata overburden structure stope pressure transfer estimation model microseismic monitoring

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	Articles by authors
	ZHANG Ming1
	2
	JIANG Fuxing3
	CHEN Guangyao4
	JIAO Zhenghua1
	HU Hao1
	CHEN Baobao1

Cite this article:

ZHANG Ming1,2,JIANG Fuxing3, et al. A stope stress transfer model based on the motion state of thick and hard rock strata and its application#br#[J]. , 2020, 39(7): 1396-1407.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2019.1118 OR https://rockmech.whrsm.ac.cn/EN/Y2020/V39/I7/1396

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