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

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 K₁ and q after implementing the blasting. The results show that prevention and control mechanism 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 K₁ decreases 17.51%, the predictive index have obviously decreased.