Blasting strong rocks in the constrained conditions

Abstract

Abstract The article deals with a new technology of blasting strong rocks in the constrained conditions of reconstructing railways by means of widening the recesses or shelves on the slope. Reliable no-fly stone rock blasting is provided by installing a transformable gas-permeable shelter on the blast block. The blast containment shelter includes upper frames placed on the surface of the blast block and side frames to shelter the side slope of the ledge. Special elastic elements that serve as a transformable gas-permeable shelter made from heavy-duty dump trucks worn-out tires are suspended on the frames. Shelter frames are installed on railway platforms. The use of a railway crane in hitch with cargo platforms provides the fold increase of the covered area of the explosive block as the time allocated to the technological “window” is taken only for installing and removing the shelter by a railway crane and the time for blasting the block. The time is not lost on moving the blasted rock debris left on the flooring sleepers in the existing railway track by the bulldozers to the excavating pit and for doing other work. A reliable no fly stone rock blasting when creating the secondary tracks of the railways is also provided by using decelerations when initiating explosives.