Distribution of Impact Pressure on Hole Wall in Deep-Hole Blasting with Multi-Stage Axial Air Deck
In order to determine the reasonable air-deck length in underground vertical deep-hole blasting,the internal distribution function of impact pressure on hole wall with different air-deck length in multi-stage air deck blasting was analyzed based on the detonation wave theory.According to the Mises criterion,the reasonable reference values of air-deck length were obtained for different kinds of rock,which was verified by numerical simulation and on-site blasting test.The results show that the impact pressure on the hole wall of the air deck drops abruptly from both sides to the center along the axis of the hole,but increases slightly around the midpoint,and the pressure distribution presents a symmetrical W-shaped curve,with much higher values on two sides,lower in the middle section,and slightly higher around the center.
deep-hole blastingaxial decoupled chargemultistage air deckimpact pressure on hole wallnumerical simulation
万方数据
维普
