掏穴钻孔在煤层消突中的应用

为了解决穿层钻孔预抽煤层瓦斯时抽采浓度低、抽采效果差,造成煤层消突不彻底这一难题,在设计钻孔时在常规穿层钻孔预抽瓦斯技术的基础上采用掏穴扩孔工艺。通过对煤层段进行扩孔增加对周围煤体的扰动,增大钻孔周围煤体的膨胀变形程度,使得煤层卸压更加充分,煤层的透气性增强,钻孔预抽瓦斯的消突效果提高,煤与瓦斯突出的可能性降低。

Application of Removing Outburst with Digging-hole Drilling in Coal Seam

In order to resolve the problem that low gas drainage concentration,poor results of the gas drainage causing removing gas outburst inadequate during holing for gas drainage,adopts digging-hole drillings technology on the basis of designing crossing hole used to drainage gas.It can increase disturbance around the coal,increase the expansion deformation degree of the coal around the drilling,make pressure relief of the coal seam more fully,strengthen the permeability of coal seam,improve the effect of drainaging gas and removing outburst and reduce the possibility of coal and gas outburst.