关键词: 掏槽爆破, 炮孔角度对称性, 爆破能量, 爆破效果

Abstract: In order to research the effect of hole angle symmetry on cut blasting，the mechanism of wedge-shaped cut blasting was theoretically explained，similar simulation test of wedge-shaped cut blasting symmetry was made in the laboratory with cement mortar models and RDX，meanwhile，the depth and volume of groove cavity and the utilizing rate of borehole after blasting was comprehensively analyzed.The cycle footage can be enhanced by 11.5% through the field test of wedge-shaped cut blasting symmetry in Tunliu Mine in Lu'an.The result shows that blasting energy can be effectively used，the depth and volume of groove cavity can be increased and footage of cycle can be enhanced when the borehole angles were symmetrically disposed.The blasting effect of symmetry of borehole angle is better than asymmetry.Moreover，this article has a reference value for the tunnel and laneway construction.

Key words: Cut blasting, Symmetry of borehole angle, Blasting energy, Blasting effect