多层含气煤层集约开采中破坏倾斜排水孔的稳定性保障

IF 2.4 Q2 MINING & MINERAL PROCESSING
V. Brigida, V. Golik, Y. Dmitrak, O. Gabaraev
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引用次数: 9

摘要

随着高产面推进,对破坏排水孔的可靠运行提出了更高的要求。在瓦斯含量、开采深度和生产设备容量自然增加的情况下,如何保持高强度的气体煤层开发是一个难题。最大的威胁来自于承压影响区(工作面前方)和悬垂岩柱密集移位区(工作面后方)的孔稳定性损失。由于钻孔通道变形导致的漏风加剧,导致被清除的甲烷-空气混合物贫化,扰乱矿区安全气态的风险增大。本文阐述了采煤工作面开采对井下孔洞状态和悬垂岩柱形成的影响机理。提出了钻孔变形的基本类型。指出了目前应用最广泛的生产工作面高负荷下瓦斯煤层开发技术方案存在的严重缺陷,不利于瓦斯抽采系统的正常运行。研究结果更精确地定义了炮孔数以及炮孔轴线与井眼之间的距离对井眼轮廓应力状态的依赖关系。在此基础上,提出了排烟孔系统钻井参数的计算公式。这些措施的实施将有助于提高地下瓦斯抽采效率,保持瓦斯煤层开发强度的持续增长。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Ensuring Stability of Undermining Inclined Drainage Holes During Intensive Development of Multiple Gas-Bearing Coal Layers
At high rates of production face advance, requirements towards reliable operation of undermining drainage holes get raised. The issue of maintaining high intensity of gaseous seams development under naturally increasing gas content, mining depth and capacity of production equipment poses a problem. The greatest threat comes from the loss of hole stability in the bearing pressure affected zone (in front of the face) and in the intensive shift area of overhanging rock corbels (behind the face). Intensification of air leaks due to deformation of borehole channel leads to impoverishment of removed methane-air mixture and an increasing risk to disturb safe aerogas regime in the mining area. The paper describes a mechanism of how coal-face operations affect the state of underground holes and formation of overhanging rock corbels. A typification of basic kinds of borehole deformations is presented. Authors point out critical disadvantages of the most widely-used technological schemes of gaseous seams development under high load on the production face, which hinder normal operation of a gas drainage system. As a result of research, a dependency of shot hole number, as well as the distance between shot hole axes and the borehole, on the stress state of the borehole outline has been defined more precisely. Basing on that, a formula to calculate drilling parameters of the discharge hole system has been suggested. Implementation of these measures will allow to increase the efficiency of underground gas drainage and to maintain growing intensity of gaseous coal seam development.
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来源期刊
Journal of Mining Institute
Journal of Mining Institute MINING & MINERAL PROCESSING-
CiteScore
7.50
自引率
25.00%
发文量
62
审稿时长
8 weeks
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