浅埋复采工作面厚硬岩层–煤柱结构模型及其稳定性研究

doi:10.13722/j.cnki.jrme.2018.0825

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Abstract Thick hard strata and coal pillars are the main factors for the mining-induced dynamic disasters in shallow-buried re-mined panels. In order to reveal the relation between the thick hard strata movement and the evolution of the coal pillar stress and its instability regularities，the shallow-buried re-mined panels in Gaozhuang mine in Shandong Province，China，is investigated as the engineering background. A“thick hard strata-coal pillar”structure model of the stope is proposed，and the gravity form，range size and deformation features of different strata of the structure model are analyzed. An expression of the concentrated force of the solid support and the periodic breaking step of thick hard strata is derived，and the mechanical instability criterion of“Thick Hard Strata-Coal Pillar”，the variation features of the coal pillar stress，and disaster prevention and control methods are discussed considering the relationship between the“dynamic-static”loading stress of coal pillar and its comprehensive supporting strength. The research results indicate that the hydraulic re-mining panel can form a continuous“┤”type space structure under the condition of thick strata，which includes a horizontal“deliver body”and a vertical“support body”，and that the periodic motion of the“deliver body”is the main reason for the stress concentration and transfer of the coal pillar. It is also shown that the static support stress p of the coal pillar is mainly formed by the“support body”gravity(G and FL) and the“deliver body”transferring gravity F2，and the break motion of the thick strata of the“deliver body”is the main cause of the dynamic stress pd，which interprets the instability types of I，II–1，II–2 and II–3 of“Thick Hard Strata-Coal Pillar”structure model. The research results were successfully applied to the No.3upper301 panel and safe recovery of the panel was carried out by using prevention and control measures. The rationality of the prediction model was further proven by the microseismic and stress monitoring results.

Key words： mining engineering shallow-buried seam re-mined panels thick hard strata coal pillars instability criteria disaster prevention and control

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	ZHANG Ming1
	CHENG Yunhai1
	WANG Lei1
	JIANG Fuxing2
	LI Qi3

Cite this article:

ZHANG Ming1,CHENG Yunhai1,WANG Lei1, et al. Structure model and stability research of thick hard strata-coal pillar in shallow-buried re-mined panels[J]. , 2019, 38(1): 87-100.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2018.0825 OR http://www.rockmech.org/EN/Y2019/V38/I1/87

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