Numerical Simulation Research Based On SPH Blasting Hopper Volume And Throwing Speed

This paper uses ANSYS(LS-DYNA)software to calculate and simulate the three-dimensional numerical simulation of blasting funnel formation process.Firstly,the calculation method is SPH method,the constitutive model is RHT,and the mechanical parameters related to the calculation model are determined by comparison of mechanical tests and field model experiments with simulation calculations,formula calculation,and consulting related literature.After determining the size of the model and related parameters,the numerical simulation calculations were performed for the cases where the charge amount of the spherical charge packet and the different length-diameter ratio charge packet were changed and the constant load was changed.The following conclusions.The dose of the ball type drug dose is constant(0.86g),and the calculation of the charge of the drug pack is increased from 0.04 m to 0.085 m.The funnel volume decreases with the decrease of the resistance line,and the blasting funnel volume is filled as The maximum value is 0.078 m,which is the unit consumption of 0.6kg/m3.In the ball-type drug package,the volume of the blasting hopper will gradually increase by 10% to 20% in the calculation process when the corresponding drug dose increases from 0.86 g to 2.37 g under the condition that the drug pack is not changed.In the calculation model of length-to-diameter ratio 2-5,the packing was increased from 0.04 m to 0.08 m,and the drug amount remained unchanged(the doses of the length-diameter ratio 2-5 were 1.72 g,2.58 g,3.44 g,and 4.34 g,respectively).Under the circumstances,the blasting funnel volume gradually increased,and the increase ranged from 36% to 69%.The radius of the expanding cavity of the blasting hopper is increased from 3.1cm to 5.5cm compared to the minimum resisting line.The depth of the blasting hopper is increased by 3.7cm to 8.5cm from the depth of the blasthole,and the radius of the funnel is gradually increased.When the explosive performance parameters and the rock geological conditions are the same,there is an optimal depth for the drug packages with different aspect ratios.Under the condition that the pore size is constant,the optimal burial rate should be increased when the dose increases to a certain extent.The depth remains the same.In this paper,when the length-to-diameter ratio is increased to 3,the best burial depth is fixed at 13 cm.That is,under the conditions of model mechanics parameters in this paper,the best depth of blasting hopper is 13 cm.