MODEL TESTING STUDY ON PREFABRICATED SPIRAL V-NOTCH BLASTING
螺旋切槽孔松动爆破模型试验研究

Prefabrication spiral V-notch blasting can control diameter of blasting block and reduce the second blasting by adjusting spiral angle. Model testing study is made on prefabricated spiral V-notch blasting,and hydromatic method is used to simulate the quasi-static process in blasting of explosive. It is found from the model test that the crack initiates and develops along the tip of spiral V-notch and that the bigger the spiral angle is the easier the crack initiates and the spiral V-notch hole model is easier to crack than the circle hole one.