【摘要】 为提高低透气性高突出煤层瓦斯抽放率,达到预防瓦斯突出的效果,将深孔预裂爆破技术运用于某煤矿低透性高突煤层,考察了这种爆破对煤层透气性系数、百米钻孔瓦斯流量、瓦斯抽放量、抽放浓度、瓦斯抽放率以及突出预测敏感指标的影响。试验结果表明:采用深孔预裂爆破技术后,煤层透气性增强,瓦斯抽放率提高,各项预测指标在回采期间没有出现超标情况,同时也没有发生过瓦斯动力现象和煤与瓦斯突出。更多还原

【Abstract】 In order to improve gas drainage rate of low permeability and high outburst coal seam and prevent gas outburst accidents,deep hole pre-split blasting technology was attempted to apply to the low permeability and high outburst coal seam in certain coal mine.By designing blast parameters,an application test was conducted,and the blasting effects were studied by analyzing such indexes as coal seam gas permeability coefficient,gas flow at 100-meter drilling hole,gas drainage quantity,gas drainage concentration,gas drainage ratio and outburst prediction sensitive indexes.The result shows that,after applying deep hole pre-split blasting technology,gas permeability of coal seam is improved and gas drainage ratio is enhanced;the prediction indexes in the recovery period are within standard range.Meanwhile,gas power phenomenon and gas outburst do not occur.更多还原