IMPACT OF THE MATERIAL TO RETAIN THE EXPLOSION PRODUCTS ON THE QUALITY OF THE BUILDING MATERIAL IN QUARRYING

The paper reveals the issue of improving the quality of rock mass crushing in quarries of building materials. The analysis of methods for improving the quality of crushing has been performed. A method to increase the time of impact of explosion products on a mountain massif by changing charge design has been proposed. The method was tested and the results of explosions at the quarry of Leningrad region were presented. The experimental data show: theoretical calculations are consistent with experimental data and have a slight deviation; the parameters of the rock mass disruption allow using wheel loaders in the quarry. Yet, the use of new charge designs enabled improving the quality of crushing, namely, increasing percentage of output of an average piece of conditioned fraction, therefore, optimizing operation of the mining entity as a whole.