ANALYSIS ON IMPROVING EFFECTIVENESS OF LARGE DIAMETER LONG-HOLE SIDE-BLASTING METHOD IN HARD ROCK MASS

In the paper,the factors included distribution ratio of impact energy and expansion energy in blasting,detonating style and charge system affecting the effectiveness of large diameter long-hole side-blasting method in hard mass were analyzed.In order to improve the blasting effectiveness,the author pointed out that the high wave impedance value explosion and the rationa detonating style with higher detonating energy should be preferred,so that the impact energy can be increases in blasting,meanwhile,the mode of hollow columnar loading and continuous loadnig should be used as much as possible,and axial interval loading should be used as less as possible even be cancelled.