Theories and methods of coal and gas outburst prevention by strong-weak coupling energy control in coal roadway driving face

被引：0
|
作者：
Zheng Y. [1 ,2 ]
Zhai C. [1 ,2 ]
Xin H. [1 ,2 ]
Tang W. [1 ,2 ]
Sun Y. [1 ,2 ]
Xu J. [1 ,2 ]
机构：
[1] School of Safety Engineering, China University of Mining and Technology, Xuzhou
[2] National Engineering Research Center for Coal Gas Control, China University of Mining and Technology, Xuzhou
来源：
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | 2021年 / 38卷 / 06期
关键词：
Coal and gas outburst; Coal roadway excavation; Field test; Numerical simulation; Strong-weak coupling model;
D O I：
10.13545/j.cnki.jmse.2020.0518
中图分类号：
学科分类号：
摘要：
In view of high outburst risk and serious surrounding rock deformation during an excavation of outburst coal seam, a strong-weak coupling anti-outburst method of penetration grouting reinforcement and hydraulic flushing was proposed based on time-space coordination mechanism of strengthening coal and enhancing gas extraction. The anti-outburst mechanism of strong-weak coupling structure was analyzed from energy perspective. Stress response and deformation evolution of coal roadway surrounding rock with strong-weak coupling structure were studied through numerical simulation of coal roadway driving, revealing that strong-weak coupling scheme can realize dual purpose of migrating concentrated stress and reducing coal roadway deformation. The field test finds that compared with hydraulic flushing section, deformation of two sides of coal roadway and roof convergence in strong-weak coupling section decreases by 58.51% and 61.42%, respectively. Fracture degree of two sides in hydraulic flushing section is greater than that in strong-weak coupling section, and stress concentration areas in the two sections are about 4 m and 5 m, respectively. Excavating velocity increases by 15.34% after the application of strong-weak coupling structure. Penetration grouting reinforcement and hydraulic flushing strong-weak coupling anti-outburst measure can decrease gas content and pressure, reinforce coal body, small roadway deformation, and safe coal mine. © 2021, Editorial Board of Journal of Mining & Safety Engineering. All right reserved.
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页码：1269 / 1280
页数：11
相关论文
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