深孔控制水封预裂爆破试验研究

Experimental Research of Deep Hole Pre-splitting Blasting with Water Seal

通过现场考察深孔水封预裂爆破措施，分析了爆破措施后，工作面前方的瓦斯涌出和预测指标K1值、q值的变化情况。结果表明：深孔控制水封预裂爆破的防突机理是改变前方煤体地应力和瓦斯涌出速度共同作用的结果，确定了深孔控制水封预裂爆破钻孔的有效影响半径是2．0～2．5m；实施深孔控制水封预裂爆破措施后，工作面瓦斯涌出量急剧增大，预测指标墨值最大值减小29．51％，平均值减小17．51％，预测指标有明显降低。

Through the field investigation of deep hole pre - splitting blasting with water seal, the paper analyzed the change situations of gas emission and the predictive index Kt and q after implementing the blasting. The results show that prevention and control mecha- nism of coal and gas outburst of deep hole pre - splitting blasting with water seal is the result of changing the ground stress of coal and gas emission rate. The study ensures the influence radius of drilling is 2.0 - 2.5 m. The gas emission quantity increases and the predictive index K1 decreses after implementing the blasting. The maximum of the predictive index K1 decreases 29.51% and the average of Kl decreases 17.51% , the predictive index have obviously decreased.