DESTRUCTION OF HARD ROCKS BY EXPLOSIVE CHARGE OF A FRAME-STEP ACTION

The article presents the technology of multiple focusing of a cumulative jet and its directional action in a cumulative ammunition to enhance the cumulative flow without increasing the mass of the explosive charge. An increased cumulative flow is considered to increase its velocity. When a downhole charge explodes, rocks are destroyed by compression due to the high pressure of the explosion energy, resulting in a significant amount of crushed mass around the charge, which crumbles during overload and delivery and violates the environment. An increase in the mass of the borehole charge does not ensure the accuracy of the rebound and leads to an increase in the spread of rock mass, which reduces safety in places where blasting operations are carried out, as well as labor costs increase during dismantling and installation of equipment to preserve mining machines and electric power supply systems, and the volume of repair and restoration work increases. Taking into account the above drawback, a new accelerator design with a cascade-step action of a cumulative charge has been developed. The shape of the cumulative accelerator now has a streamlined volumetric shape, which increases from the fuse so as not to create air cushions and ensure the sealing of the bulk charge. The proposed innovative explosive technology can be used in mining and other industries to increase the productivity of blasting operations for destruction, crushing and accuracy of the destroyed rock mass to improve the environment in places of blasting without the release of oversized pieces.