Doludarev V. Management regrinding rocks using charges of gas-making components

3. Object - a process of rock destruction with explosion; purpose - reducing of overgrinding rock mass during blasting, which is achieved using the developed rational constructions of elongated explosive charges with gas-forming components; novelty - first theoretically is shown the influence of introduced into the explosive knock-free gas-forming components, and its granulometric characteristics of the change of the thermodynamic parameters of the detonation products in the charging chamber; theoretically the influence of the burning rate of the gas-forming components for changing pressure of the detonation products in the charging chamber is found; experimentally determined the effect of different locations of gas-forming components of varying size in the explosive charge on its working capacity and changes in particle size distribution of a broken rock; results - for the first time is given the dependence (correlation coefficient 0.9508) of maximum pressure of detonation products on the percentage of gas-forming components in its peripheral distribution; for the first time is found that the contact of high temperature detonation products with the walls of the well affects on the output of overgrinding fraction. Using of different shells allows decreasing for 15 - 25% the overgrinding of rock mass (compared with the results of the explosion of the charge without the shell).