Mechanism of rock burst induced by overall instability of isolated coal and its prevention in large well at thousands-kilometer underground

被引：0
|
作者：
Wang G. [1 ]
Zhu S. [1 ]
Jiang F. [1 ]
Wang B. [2 ]
Zhou T. [2 ]
Zuo E. [1 ]
Kong Z. [2 ]
机构：
[1] School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing
[2] Zhaolou Coal Mine, Heze Yanzhou Energy and Chemical Co Ltd of Yanzhou Coal Mining, Heze, 274000, Shandong
来源：
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | 2019年 / 36卷 / 05期
关键词：
Deep large well; Isolated coal; Overall instability; Rock burst; Stress concentration;
D O I：
10.13545/j.cnki.jmse.2019.05.014
中图分类号：
学科分类号：
摘要：
With mine area 35000 of Liangbaosi mine as engineering background, the mechanism of rock burst induced by the overall instability of isolated coal resulted from deep large well cutting has been investigated through methods of on-site investigation, theoretical analysis and numerical simulation. Firstly, the distribution of bearing pressure has been studied on the large well with different alley spacing. And then, an overall instability mechanics model has been built for the isolated coal after the pressure is relieved on the surrounding rock of the large well. Finally, the mechanism of rock burst induced by overall instability of isolated coal beside large wells at thousands-kilometer underground has been revealed. The results have shown that in the isolated coal beside large well in deep mine, a "high stress isolated coal body" is formed with the superposition of gravity stress, geological tectonic stress, and concentrated stress caused by strip mining. The pressure-relief on the isolated coal leads to the reduction in its bearing range and further increase in the stress concentration. And finally an overall instability rock burst will be easily induced, when the average stress of the isolated coal exceeds its comprehensive strength. In view of this, measures including leaving rational space between roadways, arranging rational roadway horizon, and strengthening the monitoring and early warning are put forward to prevent and control this type of rock burst. The results of this study lay a theoretical basis for the overall instability of isolated coal in deep well and provide a technical reference for designing a deep mine with high risk of rock burst and preventing the rock burst at an isolated coal. © 2019, Editorial Board of Journal of Mining & Safety Engineering. All right reserved.
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页码：968 / 976
页数：8
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