Evolution of overburden structure and reasonable width of section coal pillar in large space isolated island stope

被引：0
|
作者：
Tu M. [1 ]
Lin Y. [2 ]
Zhang X. [1 ]
Pu Q. [1 ]
Dang J. [1 ]
Zhao G. [1 ]
机构：
[1] Co-Construction Key Laboratory of Safe and Efficient Coal Mining of Ministry of Education, Anhui University of Science and Technology, Huainan
[2] School of Mechanics and Photoelectric Physics, Anhui University of Science and Technology, Huainan
来源：
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | 2021年 / 38卷 / 05期
关键词：
Evolution of overburden structure; Fully-mechanized top coal caving in extra-thick coal seam; Large space isolated island stope; Stability of section coal pillar;
D O I：
10.13545/j.cnki.jmse.2021.0195
中图分类号：
学科分类号：
摘要：
The evolution and stability of overburden structure in large space isolated island stope are very important to the stability of section coal pillar which is directly related to the width of coal pillar. To improve the stability of section coal pillar and coal recovery rate, the evolution of overburden structure and deformation and load-bearing characteristics of section coal pillar in large space isolated island stope were studiedthrough mathematical derivation. Based on the limit equilibrium of section coal pillar, reasonable width of section coal pillar was derived, and the internal parameters of the system affecting the width were determined. The influence law of internal parameters on the reasonable width of section coal pillar was studied through single factor analysis method and the criterion of function increase and decrease, and measures to reduce the width of section coal pillar to improve recovery rate were proposed based on the analysis. The results have shown that the reasonable width of coal pillar in large space isolated island stope is jointly determined by 9 internal system parameters: the burial depth of coal seam, the height of coal pillar, the length of working face, the length of cantilever beam above section coal pillar, the height of coal seam tokey stratum, the degree of stress concentration, the suspension roof distance of key stratum, the coefficient of lateral pressure at the interface of elastic-plastic interface insidesection coal pillar and the coefficient of friction at the interface between coal and rock mass. The reasonable width of section coal pillar increases with the increase of the former seven parameters and decreases with the increase of suspension distance of key stratum and the friction coefficient at the interface between coal and rock mass. Based on the influence of the system internal parameters on the reasonable width of section coal pillar, measures are proposed to reduce the width of section coal pillar in large space isolated island stope and improve the recovery rate by controlling the length of working face, blasting or hydraulic cutting roof to change the overlying rock structure, high strength grouting and bolt-shotcrete support, and improving the friction coefficient of coal and rock mass. © 2021, Editorial Board of Journal of Mining & Safety Engineering. All right reserved.
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页码：857 / 865
页数：8
相关论文
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