摘要
针对鑫瑞煤矿5号煤层工作面及工作面巷道传统的树脂锚杆不能有效提高巷道破碎顶板整体稳定性,不能充分施加预紧力等问题,分析了极近距离煤层群开采时巷道破坏的主要原因,提出了"水力膨胀锚杆+钢筋梯子梁+锚网"联合支护技术,并通过分析水力膨胀锚杆受不同拉拔力时锚杆轴向分布应力,建立水力膨胀锚杆作用的力学分析模型,简要介绍了水力膨胀锚杆的作用机理和应用条件。基于数值模拟和力学模型的力学效应分析情况,将适应性较强的水力膨胀锚杆应用于鑫瑞煤矿。实践表明:采用"水力膨胀锚杆+钢筋梯子梁+锚网"联合加固支护新技术,能够有效控制下分层巷道围岩强烈变形,并取得良好的支护效果。
As in working face and the roadway of Xinrui Coal Mine No. 5 coal seam, conventional resin bolt failed to improve the overall stability of the roadway broken roof, leading to inadequate preloading, the main reasons for roadway damage of ultra-close seam mining was analyzed, a combined support technology was proposed using hydraulic expansion anchor, reinforced ladder beams and anchor mesh. By analyzing hydraulic expansion anchor bolt drawing force under different axial stress distributions, a mechanical model was established for hydraulic expansion bolt action, and the hydraulic expansion bolt mechanism and application conditions were briefly introduced. Based on the mechanical effects of numerical simulation and mechanics analysis of the model case, hydraulic expansion bolt was applied in Xinrui Coal Mine. The practices showed that the violent surrounding rock displacements of lower slicing roadway was effectively controlled using the combined support technology, favorable supporting effect was achieved.
出处
《煤炭工程》
北大核心
2017年第2期39-42,共4页
Coal Engineering
关键词
水力膨胀锚杆
巷道加固
托锚力
力学模型
hydraulic expansion bolt
roadway reinforcement
supporting anchor force
mechanical model
