Peak Elimination Effect of Radial Uncoupled Charge on Explosion Pressure and Its Influence on Rock Fracture Range
Understanding the law of rock fracture induced by single hole blasting is the basis to reveal the mechanism of rock fracture induced by multi-hole blasting.The mechanism of rock fracture induced by single hole blasting is clarified theoretically,and then the change process of stress,the propagation process of crack and the sizes of rock crushed zone and cracked zone with the decoupling coefficient of 1-3.5 are simulated by using a high explosive model and a rock RHT model.The laws of variation of the peak value of blasting pressure on the blast hole wall and the ranges of crushed zone and cracked zone with the increase in decoupling coefficient are analyzed.Calculated results show that the air-decoupling charge structure has about 2 times the peak shaving effect on the blasting pressure than the water-uncoupled charge structure due to the influences of different decoupling media.With the increase of decoupling coefficient from 1 to 3.5(unchanged charge diameter),the diameters of crushed zone and cracked zone for the air-decoupling charge structure ranges from 4.44 to 1.59 and 22.5 to 7.62 times hole diameter,respectively.While for the water-decoupling charge structure,the diameters of crushed zone and the cracked zone are 4.44 to 2.74 times and 22.5 to 10.67 times more than hole diameter,respectively.
single hole blastingrock breakagedecoupling coefficientcharge structurecrushed zonecracked zone
万方数据
维普
