Abstract:In order to explore the anti-reflection effect of blasting under the coupling action of slit charge pack and control hole, a numerical analysis model was established and solved by using ANSYS/LS-DYNA numerical simulation software, and the crack propagation and stress distribution characteristics of anti-reflection effect on soft coal seam under the joint action of slit charge column blasting and control hole were obtained. The results show that the blasting effect of directional control of fractured soft coal seam under the coupling action of slit charge pack and control hole is better than that of single slit charge column. When the stress wave propagates to the control hole, the reflection superposition of the wave occurs, the peak of tensile stress increases, and the deflection of the burst crack is obvious. The control hole plays a guiding role in crack propagation and further promotes the development and propagation of crack. The research results can provide theoretical basis and data support for the engineering practice of soft and low permeability coal seam with blasting permeability improvement.