Model Test Study On The Influence Of Non-coupling Coefficient On The Effect Of Water Hole Blasting

Based on the blasting and physical and mechanical parameters of rock,the model test is designed based on the similarity theory.The blasting effect of the water hole blasting model under different uncoupling coefficients is compared and analyzed.The water blasting model block under different uncoupling coefficients is studied.Degree and the change of the volume of the explosion chamber.Based on the theory of explosion mechanics,the effect of water in the process of water hole blasting was analyzed.The difference of blockiness and energy utilization between the water medium and air uncoupled charge was compared.According to the similar model theory,a similar model test of water hole blasting with different uncoupling coefficients was designed,and the blasting effect of the model was comprehensively analyzed.The empirical function method and the fractal damage model are used to analyze the block distribution after the blasting of the water hole blasting model under different uncoupling coefficients,and the variation of the block distribution after the model blasting under different uncoupling coefficients is obtained.Using the empirical method to analyze the blockiness after blasting with K₅₀ and K₈₀,the unevenness coefficient and the curvature coefficient are introduced to analyze the blockiness after the blasting of the model,combined with the curve of the block rate,the evaluation index of the block degree.The evaluation results were compared and analyzed.The results show that the evaluation results are closer to the actual block rate when the blockiness is evaluated by using the uneven coefficient and the curvature coefficient.The variance analysis of the burst volume after blasting shows that the non-coupling coefficient affects the diameter of the burst chamber and affects the volume of the burst chamber after blasting.The prediction formula of the blasting cavity volume of water hole under different uncoupling coefficients is obtained.Finally,the variation law of the volume of the fragments after explosion is analyzed under different uncoupling coefficients.