基于楔块模型的煤壁极限稳定高度研究与应用

doi:10.13722/j.cnki.jrme.2021.0847

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Abstract In order to determine the ultimate mining height for ensuring the stability of coal wall，the characteristics of coal rib spalling under different coal seam conditions were studied. Based on the phenomenological method，the paper established the three-dimensional model and the equilibrium differential equation of the coal rib spalling，and obtained the section trajectory of the failure surface for coal rib spalling. On the basis of this，the stress equation of coal rib spalling was established by using three-dimensional simplified wedge model. By using unified formula to characterize two different rib spalling of soft coal shear failure and hard coal tensile failure，the paper analyzed the coal rib spalling mechanism of shear failure and tensile failure and put forward the formula of the ultimate mining height for ensuring the stability of coal wall. According to actual mining parameters of coal seam condition，the influence on coal wall stability limit height of coal seam parameters which include Poisson?s ratio，cohesion and internal friction，joint fissure，cohesion and internal friction of the coal and rock interface was mainly studied. The results showed that the coal wall stability limit height is increased by the increasing of the Poisson's ratio，cohesion and internal friction of coal rock interface cohesion and coal seam. Furthermore，on account of the research on the coal wall stability control effect of face guard supporting intensity，the paper put forward the estimate formula of the coal wall ultimate stability height considering the face guard supporting intensity and the improvement scheme of hydraulic powered support face guard device by analyzing the structural characteristics of different face guard devices. Finally taking the soft coal seam of Yuzhou mine in Henan province and the hard coal seam of Yulin mine in Shanxi province as examples，the validity of the research results was verified. The theoretical research results were basically consistent with the production practice data，which better explained the coal wall stability characteristics of coal seam under different conditions. The research could provide theoretical support for the coal wall stability control and the design optimization of hydraulic powered support in the super-large mining height mining face.

Key words： mining engineering wedge model rib spalling Passion?s ratio cohesion internal friction coal rock interface

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	XU Yajun1
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	DU Yibo1
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XU Yajun1,2,DU Yibo1, et al. Research and application of coal wall limit stability height based on wedge model[J]. , 2022, 41(S2): 3240-3249.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0847 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/IS2/3240

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