论文部分内容阅读
为提高坚硬低透气难抽煤层瓦斯抽放率，研究应用裁剪脉冲加载法，调整脉冲荷载，即采用钻孔有控爆破致裂技术产生适当数目的孔边裂纹。而裂纹数目主要与压力脉冲上升时间、钻孔直径和周围介质中膨胀波传播速度相关。在论述裁剪脉冲法的理论、原理及产生适当裂纹数目机理的基础上，将钻孔有控爆破致裂技术应用于现场，并确定出最佳致裂爆破参数。经现场瓦斯压力、流量等参数的对比试验测定，证明了钻孔有控爆破致裂技术，使煤层瓦斯涌出量（抽放率）提高３倍左右。
In order to improve the gas drainage rate of hard and gas-impermeable coal seam, the application of cutting pulse loading method, adjusting the pulse load, that is, the use of controlled blasting drilling technology to produce the appropriate number of hole edge cracks. The number of cracks is mainly related to the pressure pulse rise time, the diameter of the borehole and the propagation speed of the expansion wave in the surrounding medium. Based on the theory and principle of the cutting pulse method and the mechanism of generating proper number of cracks, the controlled blasting fracture technology of borehole is applied to the site and the best crack initiation parameter is determined. The field gas pressure, flow and other parameters of the comparative test to determine the controlled blasting drilling technology to prove that the coal seam gas emission (drainage rate) increased by about 3 times.