Abstract: In order to discuss the reasonable value of equivalent load in uncoupled charge blasting, the solid explosive models with different uncoupling coefficients and the equivalent load models based on the equal range of rock fracture I zone are established in this paper. After multiple trial calculations, the corresponding equivalent load of each uncoupling coefficient is determined, and then the corresponding relationship between the peak value of equivalent load and the uncoupling coefficient is obtained. The adjustment coefficients of hole wall pressure under different uncoupling coefficients are obtained by fitting. Combined with the existing formula for calculating the peak pressure of hole wall, the empirical formula of equivalent load related to uncoupling coefficient is obtained. Three examples of rock single-hole blasting with different uncoupling coefficients are simulated by explosive solid method and equivalent load method, and the damage range, peak particle velocity and peak pressure of rock are investigated and compared. The results show that the numerical simulation results of the two models are in good agreement, which verifies the accuracy of the empirical formula. This study provides a reference for the reasonable value of the equivalent load of uncoupled charge blasting.
Keywords: blasting; equivalent load; numerical simulation; uncoupling coefficient; damage range
合肥工业大学学报自科版