基于预抽时间和抽采半径关系的钻孔间距优化设计

Drilling Spacing Optimization Design Based on Relationship Between Pre-pumping Time and Extraction Radius

在保证工作面回采前抽采达标的同时,为最大程度的节省钻孔工程量,通过建立工作面瓦斯抽采半径和预抽时间模型,并在现场对抽采半径进行了实测,分析掌握了钻孔间距和预抽时间的动态变化关系,在此基础上结合巷道掘进和工作面回采速度对李雅庄矿2-609工作面运输巷分区域设计了钻孔间距,现场应用表明钻孔工程量减少27.8%,仍实现抽采达标。

While ensuring gas extraction to meet the requirements before working face mining,to maximally save borehole engineering quantity,by establishing gas extraction radius and pre- pumping time model at working face,and field measurement of the drainage radius,this article analyzes and grasps the dynamic relation between the borehole spacing and pre- pumping time. On the basis of this,in Liyazhuang Mine 2- 609 face,borehole spacing is designed for subregional combined with roadway construction speed and working face mining speed. Field application showed that drilling engineering quantity reduced by 27. 8%,which still met the requirements of gas extraction.