千米深井采动工作面矿压显现规律及覆岩位移特征研究

doi:10.13722/j.cnki.jrme.2017.1224

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Abstract In the process of deep coal mining，the rock is affected by high in-situ stress and strong mining disturbance，which is a typical dynamic and static combined loading problem. However，few mature projects can be used for reference in the exploitation of thousand meters mines. A series of geological disasters derived from underground mines directly affect the mining safety. In order to explore the rock pressure behavior law and overburden displacement characteristics of mining face at thousand meters mines，a three-dimensional monitoring system of rock pressure and overburden separation displacement was established，which was based on 24130 mining face of No.10 Mine in Pingdingshan. Under mining conditions，long-term monitoring and data analysis were carried out for borehole stress，bolt stress and roof separation displacement in the process of protective layer mining. The results show that the influence of mining disturbance on deep rock presents remarkable non-linear mechanical characteristics，not single linear increase or decrease. Moreover，the mining disturbance does not have a significant impact on the rock pressure behavior in the whole mining process，but has a significant impact in the ranges of 45–65 m and within 25 m from the mining face. The disturbance effect is remarkable with the increase of mining speed in the above two ranges. Therefore，reducing the mining speed to about 0.5 m/d in the fractured area can ensure the integrity of rock structure and the surrounding rock can have certain bearing capacity. In addition，the influence of mining on roadway roof is more significant than that of roadway sides，and the roadway roof should be strengthened in support design. The main influence area of mining on overburden displacement is in the range of 15–5 m in front of mining face. In this area，roof separation displacement develops faster，and the development speed of roof separation displacement is more significantly affected by the mining speed. It shows that when the mining speed is controlled appropriately in the range from 0.8 to 1.1 m/d，the production requirements can be guaranteed and the roof management in front of the working face can be more conducive，which provides scientific guidance for the safety production of thousand meters mines.

Key words： mining engineering thousand meters mine mining rock pressure overburden displacement long-term monitoring

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	Articles by authors
	LIU Qiang1
	GAO Mingzhong1
	WANG Man2
	3
	LI Anqiang1
	CHEN Hailiang1
	LU Tong1
	PENG Gaoyou1

Cite this article:

LIU Qiang1,GAO Mingzhong1,WANG Man2, et al. Study on rock pressure behavior law and overburden displacement characteristics of mining face at 1 000 m depth[J]. , 2019, 38(S1): 3070-3079.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2017.1224 OR http://rockmech.whrsm.ac.cn/EN/Y2019/V38/IS1/3070

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