| 煤层钻孔卸压效果影响因素分析 |
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| 引用本文： | 杜春志,刘卫群.煤层钻孔卸压效果影响因素分析[J].河北理工学院学报,2009(4):6-10. |
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| 作者姓名： | 杜春志 刘卫群 |
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| 作者单位： | 中国民航大学交通工程学院;中国矿业大学理学院; |
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| 基金项目： | 国家973计划项目(2005CB21502); 中国民航大学科研启动基金(08QD03x) |
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| 摘 要： | 钻孔卸压抽采瓦斯是解决瓦斯灾害的有效方法之一。为了研究地应力等因素对煤层钻孔卸压效果的影响,首先从理论上分析了钻孔周围的应力和卸压区范围,利用弹塑性力学理论得到了轴对称情况下卸压区半径的解析解,然后讨论了影响卸压区范围的地应力等各种因素并利用RFPA^2D分别进行了数值分析。结果表明：（1）非轴对称地应力条件下,卸压区半径随着埋深的增大而增大;（2）卸压区半径随着煤层强度的增大而减小;（3）卸压区半径随着煤层周围地应力以及钻孔孔径的增大而增大。
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| 关 键 词： | 孔周应力 卸压区 数值模拟 RFPA2D |
Analysis of Accessible Factors on Effect of Pressure Relief by Drills in Coal-bed |
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| DU Chun-zhi,LIU Wei-qun.Analysis of Accessible Factors on Effect of Pressure Relief by Drills in Coal-bed[J].Journal of Hebei Institute of Technology,2009(4):6-10. |
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| Authors: | DU Chun-zhi LIU Wei-qun |
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| Institution: | DU Chun-zhi1,LIU Wei-qun2(1.College of Traffic Engineering,Civil Aviation University of China,Tianjin 300300,China,2.College of Science,China University of Mining & Technology,Xuzhou Jiangsu 221008,China) |
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| Abstract: | Pressure releasing and gas drainage with drills is one of the efficient methods to prevent gas ravage.In order to study the factors such as geostress on effect of pressure relief by drill in coal-bed,the distressed zone and stress around drills are analyzed in theory,the analytic solution of distressed zone under axial symmetry is achieved by plasto elasticity;and then,the factors affecting distressed zone are discussed and simulated by RFPA2D respectively.The results show that:(1) in the case of non-axial ... |
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| Keywords: | stress around drills distressed zone numerical simulation RFPA2D |
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