METHOD FOR BLASTING OF BENCHES UNDER CHAIN MATS Russian patent published in 2005 - IPC

FIELD: mining industry, in particular, in mining of hard rocks in restricted condition, when it is necessary to exclude scattering of the blasted rock mass.

SUBSTANCE: the method consists in drilling of blast holes, loading of them, sheltering of the area to be blasted by mats of anchor chains and blasting of rocks. According to the invention, the method consists in drilling of blast holes, loading of them, sheltering of the area to be blasted by mats of anchor chains and blasting of rocks, after loading of the holes a horizontal chain mat is placed on the bench surface, and with the aid of a beam with flexible lugs positioned on the edge it is fastened by the anchors installed in not deep holes outside the block to be blasted, then a chain mat is placed on the side slope of the bench so that the lower edge would be laid on the bench bottom at least 2m long, and its upper edge is joined to the horizontal chain mat outside the prism of probable caving. After that the blast network is mounted over the shelter, and the sheltered bench is blasted. The claimed method of blasting of benches under a shelter provides for a rock-breaking without scattering of pieces under the bench slope.

EFFECT: enhanced safety of blasting due to prevention of scattering of rock pieces under the slope of the benches.

2 dwg