近距离煤层上行开采巷道合理布局研究

doi:10.13722/j.cnki.jrme.2017.0719

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Abstract In order to obtain the reasonable layout of roadways in the upper coal seam，the morphology characteristics of fractured zone and the concentrated stress distribution in surrounding rock induced by the mining of lower coal seam were studied with the methods of theoretical analysis，field testing and numerical simulation. This study was based on the upward mining of #2 and #4 close coal seams in No. 6 mining district of Zhaizhen mine. The results showed that the fractured zone was developed upward with the strata group as a unit under the condition of overlying composite strata structure and this forming mechanism was also verified in the field testing. The spatial morphology of fractured zone presented an irregular saddle shape tilted to the inside of the goaf with a boundary angle of approximately 75°–78°. The sub-regional rupture characteristic from bottom to top within the fractured zone was obvious. The upper #2 seam belongs to the general crack area located at the top of fractured zone. The roadway set in this areas is feasible. According to the results of numerical simulation，the broken position of the upper #2 seam was about 3–5 m on the goaf side，and the range of internal stress field was 6–10 m on the goaf side. Two schemes of roadway layout of inner stagger mode and outward stagger mode were proposed in upper coal seam based on the comprehensive study to the height，shape and sub-regional rupture characteristic of the fractured zone and the concentrated stress distribution. This layout effectively avoided the influence of fractured zone and concentrated stress field. The field application achieved good effect.

Key words： mining engineering upward mining roadways layout fractured zone morphology composite strata structure stress field distribution

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	Articles by authors
	HUANG Wanpeng1
	2
	XING Wenbin1
	ZHENG Yongsheng3
	LI Chao1

Cite this article:

HUANG Wanpeng1,2,XING Wenbin1, et al. Reasonable layout of roadways for upward mining technology of close coal seams[J]. , 2017, 36(12): 3028-3039.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2017.0719 OR https://rockmech.whrsm.ac.cn/EN/Y2017/V36/I12/3028

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