Deformation and failure mechanism of two sides of bottom-driven roadway in deep thick coal seam

被引：0
|
作者：
Shan R. [1 ]
Peng Y. [1 ,2 ]
Zhang W. [1 ]
Shan Z. [1 ]
Wang Z. [1 ]
机构：
[1] School of Mechanics and Civil Engineering, China University of Mining and Technology-Beijing, Beijing
[2] Huadian Coal Industry Group Co Ltd, Beijing
来源：
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | 2023年 / 40卷 / 04期
关键词：
bottom-driven roadway in thick coal seam; deep; failure mechanism; roadway with top coal; shear failure; splitting failure; two sides;
D O I：
10.13545/j.cnki.jmse.2022.0384
中图分类号：
学科分类号：
摘要：
With the haulage roadway of the 2201 working face in the Yingpanhao Coal Mine as the en- gineering background, the deformation and failure characteristics and key influencing factors of roadway side are analyzed in order to solve the problems of large deformation and surrounding rock maintenance of bottom-driven roadway in deep thick coal seam. Based on the analysis of stress state of roadway side, the deformation and failure mechanism of roadway side surrounding rock is discussed, the beam column mechanical model and shear slip failure model are introduced, the comprehensive failure depth and bolt length of roadway side are determined, and the numerical calculation method is used to carry out system- atic simulation research and demonstration. The results show that the upper part of the two sides crack in flakes, the middle and upper part crack in layers, and the middle part spalls and bulges obviously; the main reasons for deformation and failure of roadway sides are unreasonable support system, change of coal properties, large cross section and high in-situ stress; the deformation and failure of surrounding rock of roadway sides are characterized by “H + Y” type failure mechanism of shallow dynamic unloading splitting failure, middle deep (unilateral unconfined) uniaxial compression splitting failure (collectively referred to as “H” type failure) and deep incomplete conjugate shear failure (“Y” type fai-lure), which can explain the deformation and failure characteristics and phenomena of coal roadway in field investigation; the beam column mechanical model and the shear slip failure model can reflect the stability of the surrounding rock of roadway sides, and the comprehensive failure depth is equal to the sum of tensile (splitting) failure depth and shear (compression shear) failure depth; the results of nu- merical simulation and theoretical analysis are in good agreement. © 2023 China University of Mining and Technology. All rights reserved.
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页码：730 / 742
页数：12
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