Mechanism and design method of dynamic pressure support for non-pillar mining with automatically formed roadway

被引：0
|
作者：
Yang J. [1 ,2 ]
Min T. [1 ,2 ]
Wang Y. [1 ,3 ]
Liu B. [1 ,2 ]
Hou S. [1 ,2 ]
Chen K. [1 ,2 ]
机构：
[1] State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology (Beijing), Beijing
[2] School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Beijing
[3] School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing
来源：
Zhongguo Kuangye Daxue Xuebao/Journal of China University of Mining and Technology | 2023年 / 52卷 / 03期
关键词：
dynamic pressure support; Hoek-Brown strength criterion; non-pillar mining with automatically formed roadway; support design; the upper bound theorem;
D O I：
10.13247/j.cnki.jcumt.20210866
中图分类号：
学科分类号：
摘要：
In order to explore the design method of temporary support in the roadway during the influence of dynamic pressure for non-pillar mining with automatically formed roadway by roof cutting and pressure releasing, the evolution process and deformation characteristics of roof structure were analyzed, and the mechanism of temporary support during the influence of dynamic pressure was clarified. Based on Hoek-Brown strength criterion, the mechanical model of short cantilever beam was established, and the calculation method of support resistance when the short cantilever beam breaks at the critical position was derived by using the upper bound theorem of the limit analysis. The influence of relevant factors on support resistance was explored. In addition, the design method was applied to the field test of Ningtiaota Coal Mine, and the effect was good. The results show that the purpose of dynamic pressure support is to control the separation deformation and adapt to the rotation deformation of the roof. The support resistance increases gradually with the increase of the unit weight of roof rock mass, the vertical stress of overlying strata, the concentration coefficient of mining-induced stress and the width of roadway. Besides, the support resistance decreases gradually with the increase of the cohesion and internal friction angle of roof rock mass, the support coefficient of bulking gangues, the thickness of short cantilever beam and the asymmetry coefficient of support. Compared with other factors, the cohesion of roof rock mass, the vertical stress of overlying strata and the width of roadway have more significant effects on support resistance. © 2023 China University of Mining and Technology. All rights reserved.
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页码：457 / 465
页数：8
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