多煤层重复跨采底板巷道围岩控制技术研究

发布时间：2018-07-08 11:58

  本文选题：多煤层 + 重复跨采　； 参考：《中国矿业大学》2015年硕士论文

【摘要】：布置在煤层底板巷道大多要经受工作面跨采影响,这些巷道在未受采动影响前,往往能够保持长期稳定,一旦受到采动影响,则遭到失稳破坏,影响煤矿的安全生产,尤其是受上覆多煤层重复跨采影响底板巷道围岩变形极为强烈,严重影响煤矿正常安全生产。与单一煤层开采相比较,多煤层重复跨采底板巷道经受上覆工作面多次采动影响,围岩变形严重,一般支护手段难以有效控制巷道围岩变形。因此,对多煤层重复跨采底板巷道围岩稳定性分析及控制技术研究,具有重要的现实意义。本文以芦岭煤矿Ⅱ2采区石门受上覆8、9煤层重复跨采影响为研究背景,采用现场调查、理论分析及数值模拟等手段,对多煤层重复跨采底板巷道围岩稳定性及控制技术进行研究分析,首先,结合芦岭煤矿实际采矿地质条件,应用弹性力学半无限理论,对采场底板围岩应力分量、底板破坏深度进行应力解析计算,并建立了相应的数值模型,对工作面重复采动影响下底板围岩应力分布及变化规律进行了总结分析;然后,采用FLAC2D数值模拟软件对多煤层重复跨采下底板巷道围岩稳定性进行模拟分析,对静压条件、单个工作面跨采、重复跨采三种条件下底板巷道的活动规律进行对比,分析重复跨采下底板巷道的失稳特征与变形规律;接着,在上述研究分析的基础上,基于动压影响巷道围岩控制基本准则,提出多煤层重复跨采底板巷道的围岩控制技术-支护承载强化技术,并采用数值模拟的方法分析了支护承载结构强化技术对底板巷道围岩稳定性的作用效果;最后,结合芦岭煤矿Ⅱ2采区石门的采矿地质条件,提出支护承载结构强化技术方案,现场工业性试验结果表明,受到上覆工作面采动影响后,巷道围岩变形量控制在允许范围内,试验效果良好。
[Abstract]:Most roadways placed on the floor of coal seam have to undergo the influence of cross mining in the working face. These roadways are often able to maintain long-term stability before being affected by the mining movement. Once they are affected by the mining movement, they are destroyed and destabilized, which will affect the safety of coal mine production. Especially, the surrounding rock deformation of roadway affected by repeated overlying coal seam is very strong, which seriously affects the normal and safe production of coal mine. Compared with the single coal seam mining, the multi coal seam repeated cross mining floor roadway is affected by the overlying face many times, the surrounding rock deformation is serious, and it is difficult to effectively control the surrounding rock deformation of the roadway by general supporting means. Therefore, it is of great practical significance to study the stability analysis and control technology of the surrounding rock in the roadway of multi-seam and repeated cross-mining. In this paper, based on the research background of Shimen in Luling Coal Mine 鈪，

本文编号：2107354