METHOD TO FORM MULTICHARGE IN DROWNED WELL Russian patent published in 2012 - IPC F42D1/08 F42D3/04 

FIELD: mining.

SUBSTANCE: in the method to form charges in drowned wells, including drilling of wells, their filling with explosives and a plug from inertial materials, a multicharge is formed in wells filled with water, made of two different types of hose explosive charges. The main hose explosive charge with detonation speed corresponding to the speed of stress wave propagation in surrounding rock and weight of 75…80% from total mass of the multicharge is placed vertically along the well axis. The second hose explosive charge with high speed of detonation exceeding the speed of stress wave propagation in a rock massif and weight of 20…25% from the total mass of the multicharge, is placed along the spiral around the first hose charge, with a pitch of one turn along the vertical line equal to two well diameters. Linear initiation of the explosive multicharge is carried out simultaneously along the entire length of the well with a detonating chord with a charge of 40 g/m.

EFFECT: amplified amplitude of a voltage pulse and intensity of rocks grinding, which as a whole increases efficiency of drilling and blasting works with reduction of hazardous effect of explosion to environment.

5 cl, 1 dwg