应用渗透棒提高煤层注水效果分析及试验研究

Analysis and experimental study on improving water injection effect of coal seam with permeable rod

为改善煤层注水效果,降低粉尘对矿工及设备的危害,开展渗透棒注水煤体润湿效果分析及试验研究。通过建立煤层注水力学模型,运用驱替理论推导注水过程水气动界面的运动特征及润湿半径与注水时间、注水压力和渗透率的关系式;设计普通注水与渗透棒注水对比试验,分析渗透棒注水对煤体润湿效果的影响。试验结果表明:与普通注水润湿半径为6~8 m相比,渗透棒注水润湿半径为20 m以上,是普通注水润湿半径的2~3倍;渗透棒注水能够大幅增大煤体润湿范围、减少工作面钻孔数量、降低注水成本。

In order to improve water infusion effect and reduce harm of dust to miners and equipment,wetting effect of water infusion by permeating rod was analyzed and tested.A mechanical model of water infusion was established,and motion law of dynamic water-gas contact and formula of wetting radius with time,pressure,and permeate coefficient were deduced by using displacement theory.Then,through comparative test between ordinary water infusion and water infusion by permeating rod,wetting effect of the latter was analyzed.The results show that compared to the wetting radius of ordinary water infusion which is6-8 m,that of water infusion by permeating rod is more than 20 m,2 to 3 times of the former.It can greatly increase wetting range of coal,reduce number of boreholes in working face as well as cost of water infusion.