Roof fracture and instability law of overlying strata in fully mechanized caving mining in ultra-close thick coal seams under the room mining goaf

被引：0
|
作者：
Wang B. [1 ,2 ,3 ]
Liu C. [1 ]
Liang B. [4 ]
Zhang X. [5 ]
Zhang J. [6 ]
机构：
[1] School of Mines, Liaoning Technical University, Fuxin
[2] State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou
[3] State Key Laboratory of Water Resource Protection and Utilization in Coal Mining, China Energy Investment, Beijing
[4] School of Mechanics and Engineering, Liaoning Technical University, Fuxin
[5] School of Civil Engineering and Transportation, Liaoning Technical University, Fuxin
[6] School of Science, Liaoning Technical University, Fuxin
来源：
| 1600年 / China University of Mining and Technology卷 / 37期
关键词：
Fracture rock; Fully mechanized caving mining; Room mining goaf roof; Strong ground pressure; Ultra-close thick coal seams;
D O I：
10.13545/j.cnki.jmse.2020.06.012
中图分类号：
学科分类号：
摘要：
With working face 9205 in Beizu coalmine as research object, through similar experiment and theory analysis, room mining goaf roof structure model in fully mechanized caving mining face of ultra-close coal seams was built, the room mining goaf roof fracture law was revealed, and the related effective prevention and control advices were proposed. The study results have shown that the roof of working face 9205 is temporarily squeezed and the hinged arch is reversely rotated, and the fractured roof rock on the side of the working face slips along the fracture surface. Sliding friction and strata weight are quickly transferred to coal pillar in room mining goaf ahead of working face, superimposed with abutment pressure, and the sudden destruction of coal pillars induces large area of roof cutting down along coal pillar edge, which consequently produces strong ground pressure. During this period, room mining goaf roof periodic caving interval is slightly smaller than that of the entity coal roof of working face. The denser room mining goaf distributed in roof, the more obvious floor relief. And stress concentration of coal pillar group floor in room mining goaf is more significant than single coal pillar. Therefore, measures are put forward to prevent and control ground pressure caused by room mining goaf roof fracture as fully mechanized caving mining in ultra-close coal seams from the aspects of reinforcing initial supporting force, improving the mining speed, controlling caving intensity and changing mining height, etc. It better guarantees the safety of the working face and efficiency of mining, and provides important reference for similar condition of roof control in coal resource integration coal mine in our country. © 2020, Editorial Board of Journal of Mining & Safety Engineering. All right reserved.
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页码：1180 / 1187
页数：7
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