Optimized Design and Practice of Blasting Parameters for Hard Rock Roadway with Small Cross-Section

Hard rock roadways with small cross-sections account for a great percentage in coal mines of China,but the used rate of drilling and blasting is always very low.In order to improve the blasting rate and reduce the cost of the project,based on the rock blasting mechanism,some main factors such as the area of the workings,the physical mechanic property of rocks,the hole cutting mode,the loaded constitution,and the equipment level of coal mines were studied.According to the mechanical parameters of rocks around the roadway and the equipment level of these coal mines,the blasting parameters were optimized and used in practice,obtaining a good effect.The research results show that optimizing the blasting parameters is of practical significance for insuring the feasibility of the project,increasing the use rate of blast holes,reducing the cost of the project,and improving the technological level of the coal mine.