近距离强冲击倾向性煤层上行开采覆岩结构演化特征及其稳定性研究

doi:10.13722/j.cnki.jrme.2019.1020

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Abstract In view of the evolution characteristics and stability of overlying rock structure in the upward mining of short distance coal seams with strong impact prone，taking B4–1 strong impact prone coal seam in Kuangou coal mine as the background，a mechanical model of the key layer structure of the inverted trapezoid overlying rock structure in the upper part of the strong impact prone coal seam and the critical position of the impact is established，and a analysis method of the minimum safe distance of the coal pillar is proposed. Based on the combination of physical material similarity simulation and numerical simulation， the evolution of the overburden structure， pressure behaviours and the characteristics of focal distribution are analyzed using pressure sensors and SOS microseismic monitoring system，and the impact risk is evaluated by analyzing the stability of the overburden structure. The results show that，during the upward mining of B4-1 strong impact prone coal seam，the upper overburden presents a dynamic evolution process from “double inverted ladder” structure with the key layer as the boundary to “single inverted ladder” structure after the centralized collapse of the upper layer of the key layer. When the size of the remaining coal is small，the upper inverted ladder overburden structure has a concentrated source with large energy，and the source in the active area of the goaf is scattered with small energy . Two rockburst risk indexes Im and In，for analyzing structural stability of the inverted trapezoid overburden structure and stresses of the key stratum at the critical position of impact respectively，are put forward，and the change trend of the rockburst risk indexes is analyzed quantitatively. B4–1 coal seam is divided into three parts including relatively stable area，periodic obvious damage area and impact risk area. The accuracy of the double peak stress superposition effect is verified by numerical simulation analysis of the floor stress. The residual size of coal pillar is determined as 39.2 m to ensure the upward mining of B4–1 coal seam with strong impact tendency in short distance by comprehensive analysis of three methods. The research results provide a scientific guidance for the study of the stability of the overburden structure in the upward mining of short distance strong impact prone coal seams.

Key words： mining engineering dynamic disaster repeated mining overburden structure stability analysis microseismic monitoring

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	CUI Feng1
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	JIA Chong1
	LAI Xingping1
	2
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	CHEN Jianqiang4

Cite this article:

CUI Feng1,2,3, et al. Study on the evolution characteristics and stability of overburden structure in upward mining of short distance coal seams with strong burst tendency[J]. , 2020, 39(3): 507-521.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2019.1020 OR http://rockmech.whrsm.ac.cn/EN/Y2020/V39/I3/507

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