JUSTIFICATION OF SHOCK-AIR WAVE SAFETY OF INDUSTRIAL EXPLOSIONS OF LARGE BLOCKS IN CASCADES

An increase in the production capacity of quarries and sections is accompanied by the preparation of large volumes of rock mass for excavation in one step, therefore cascade blasting is often used, which is accompanied by an increased impact of the shock-air wave (UVV) effect on protected objects adjacent to the mining site. Analytical relations are given for determining the pressures at the front of the air waves of contact explosions and equivalent buried charges, depending on the mass of the instantly exploding charge and the distance to the protected object. An amendment is proposed that takes into account the simultaneity and imposition of the arrival of disturbances to the protected object from instantly exploding sites in various blocks at different distances during cascade explosions in open-pit mining. The dependences of the reduced depths of borehole charges operating on two free surfaces are presented. For operational calculations of UVV safety, a nomogram is presented on aligned parallel scales.