Evolution law and control technology of surrounding rock for weak and broken coal roadway with large cross section

被引：0
|
作者：
Meng Q.-B. [1 ,2 ]
Han L.-J. [1 ]
Qiao W.-G. [2 ]
Zong Y.-J. [1 ]
Li Y. [1 ]
Li H. [1 ]
机构：
[1] State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou
[2] Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Minerals(Shandong University of Science and Technology), Qingdao
来源：
Meitan Xuebao/Journal of the China Coal Society | 2016年 / 41卷 / 08期
关键词：
Evolution law; Numerical simulation with FLAC[!sup]3D[!/sup; Similar material model test; Weak and broken coal roadway; three anchor” combined supporting;
D O I：
10.13225/j.cnki.jccs.2015.1312
中图分类号：
学科分类号：
摘要：
With the increase of mining depth and the cross section size of roadway, the soft and crushing degree of roadway surrounding rock becomes serious, and the risk of roadway roof caving increases as well, which make the support and maintenance of big cross section coal roadway become difficult. Based on the surrounding rock loose circle test and analysis, the deformation and failure characteristics of weak and broken coal roadway with large cross section were revealed. Roadway deformation characteristics, the evolutionary law of plastic zone and the characteristics of surrounding rock stress were simulated by FLAC3D under different mining roadway layouts, mining thicknesses, the height-width ratios of roadway and the coefficients of lateral earth pressure. With the work above, the basis for the roadway layout optimization, and the selection of reasonable support pattern and parameters were provided. According to the characteristics of deformation and failure and the difficulties in supporting the roadway, the “three anchor” combination supporting scheme was put forward, i. e., bolting with wire mesh and shotcreting as the first step support, the high prestressed anchor and bolting-grouting as the second step support. Using numerical simulation analysis and similar material model test, the rationality of the scheme and the effect of surrounding rock control were verified, and the underground industrial tests were carried out. The result of monitoring shows that the roadway large deformation and bottom drum can be effectively controlled with the “three anchor” combined supporting technology, and the stability and safety of coal roadway surrounding rock and supporting structure can be ensured. It is an effective control technology for surrounding rock in coal roadway. © 2016, Editorial Office of Journal of China Coal Society. All right reserved.
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页码：1885 / 1895
页数：10
相关论文
共 21 条
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