Study on the bearing characteristics and reasonable width of the backfilling body for gob-side entry in fully-mechanized top-coal caving face under the roof cutting condition

被引：0
|
作者：
Feng C. [1 ,2 ]
Liu S. [1 ,3 ]
Zhang X. [1 ]
Zhang Y. [4 ]
Jiang Y. [5 ]
Li Y. [6 ]
机构：
[1] School of Energy Science and Engineering, Henan Polytechnic University, Henan, Jiaozuo
[2] School of Architecture and Civil Engineering, Anyang Institute of Technology, Henan, Anyang
[3] State Collaborative Innovation Center of Coal Work Safety and Clean-efficiency Utilization, Henan, Jiaozuo
[4] Zhongyun International Engineering Co Ltd, Henan, Zhengzhou
[5] Xinzheng Coal Electricity Zhengzhou Coal Industry Group, Henan, Zhengzhou
[6] Department of Coal Management, Shenhua Guoneng Group Co Ltd, Beijing
来源：
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | 2023年 / 40卷 / 02期
关键词：
bearing characteristics; collaborative control; double-yield model; gob-side entry retaining; parameter design;
D O I：
10.13545/j.cnki.jmse.2022.0099
中图分类号：
学科分类号：
摘要：
Roadway retaining technology of roadside backfilling combined with roof cutting working face in advance is one of the effective ways to solve the difficulty of retaining roadway in fully-mechanized coal mining with top-coal caving, and the rational design of roadside backfilling body's parameters is the key to the success of this roadway retaining method. The whole equivalent bearing constitutive relation of goaf in cutting roof height is established in this paper. Based on this constitutive relation, the support resistance of the backfilling body is deduced. Combined with the 12209 longwall engineer geological conditions of Zhaojiazhai colliery, the reasonable width and deformation range of the backfilling body are calculated. Based on the numerical inversion of the goaf's bearing constitutive relationship within the range of top cutting height, the bearing characteristics of the backfilling body are revealed and the reasonable width is determined. The research shows that the compression displacement increases in the goaf and the support action of the backfilling body decreases in the dynamic process from contact to gradual compaction between the upper fault strata and the collapsed gangue in the goaf. The theoretical calculation shows that the minimum width of the backfilling body is 1.95 m. With the advance of the working face, the bearing capacity of the backfilling body increases sharply at first, then increases rapidly, and finally stabilizes in three stages, and maintains a coordinated relationship with the bearing characteristics of gangue in the goaf. The optimal width of the backfilling body is determined to be 2.2 m in the 12209 fully-mechanized caving face of Zhaojiazhai colliery. The engineering practice shows that the surrounding rock stability of gob-side entry retaining performs well, and the aim of surrounding rock stability control is realized for this kind of roadway. © 2023 China University of Mining and Technology. All rights reserved.
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页码：232 / 242
页数：10
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