CHARGE FOR BREAKAGE OF ROCKS Russian patent published in 1995 - IPC

FIELD: rock breakage. SUBSTANCE: charge for breakage of rocks has explosive with cavity in its center. Introduced into cavity is structure capable of gas emission under the action of detonation wave. Structure surface has acoustic impedance larger than impedance of explosive encircling it. To fully utilize energy potential of explosive and provide for safety in operation, explosive and structure material should be selected so that their oxygen balances are of opposite sign. EFFECT: reduced explosive consumption, regulated fraction content of broken mass and cut down labor input for charging blastholes. 2 cl, 4 dwg