METHOD FOR EXPLOSION WORK TAKING INTO ACCOUNT PRE-DESTRUCTION AREA Russian patent published in 2021 - IPC F42D1/08 F42D3/04 E21C41/26 

FIELD: mining.

SUBSTANCE: invention relates to the field of explosive destruction of rocks using multi-serial short-delay firing and can be used in various industries that apply blasting operations in rock massifs of rocks. Method of blasting operations taking into account the pre-destruction area, including working out a model of the development of a large-scale explosion in time and space for a specific blasting scheme, supplying a starting pulse for blasting simultaneously to two cutting rows located in the second or the third row of borehole charges from the block edges. The starting impulse for blasting is given from opposite ends of the cutting rows towards each other. The deceleration interval in the cutting rows is taken at least 100 msec. It is twice as high in the perpendicular direction, along the rows of bump holes.

EFFECT: increased intensity of the rock mass weakening in the greater part of the blasted block.

1 cl, 4 dwg