Coal ribs stability analysis and control countermeasures of bare roof roadway under hard roof condition

被引：0
|
作者：
Yang R. [1 ,2 ]
Zhu Y. [1 ]
Li Y. [3 ]
Li W. [1 ]
机构：
[1] School of Mechanics and Civil Engineering, China University of Mining & Technology-Beijing, Beijing
[2] Civil and Resource Engineering School, University of Science and Technology Beijing, Beijing
[3] School of Energy and Mining Engineering, China University of Mining & Technology-Beijing, Beijing
来源：
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | 2020年 / 37卷 / 05期
关键词：
Bare roof roadway; Damage; Hard roof; Rib stability; Surrounding rock control;
D O I：
10.13545/j.cnki.jmse.2020.05.001
中图分类号：
学科分类号：
摘要：
In order to study the rib support problems of the bare roof roadway under hard roof condition, on-site investigation, mechanics analysis, numerical calculation and industrial test have been used comprehensively to analyze the stability of the ribs, and targeted control measures have been put forward. According to the elastoplastic theory, an unloading mechanical model has been constructed to derive an analytical expression of stress at any point of the ribs. Based on the stress state of the ribs, the tensile damage criterion has been obtained. Then the controlling variable method has been adopted to calculate the influence of the unloading coefficient and the fracture dip angle on the damage of the ribs with Matlab. In view of the deformation and failure characteristics of the ribs, the surrounding rock control principle based on "rib strengthening to protect the roof and corner strengthening to control the span" has been proposed. The field test results have shown that the support scheme can maximize rib foundation strength to minimize roof rock beam disturbance, thus ensuring safe and effective roadway use during service. © 2020, Editorial Board of Journal of Mining & Safety Engineering. All right reserved.
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页码：861 / 870
页数：9
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