METHOD OF DRIVING RAISES Russian patent published in 2017 - IPC E21D1/00 E21D3/00 F42D3/04 E21C41/16 

FIELD: mining engineering.

SUBSTANCE: method of driving the raise includes preliminary slotting along raise contour over entire height and subsequent crushing of rock array separated from rock mass by blast method. The raise shape is made in the form of a truncated pyramid with a larger base downwards, holes are drilled along side faces and ribs of the pyramid and explosive charges positioned therein are blasted simultaneously, forming a slit along the raise contour. The block of rock separated from the rock array in the rise contours is crushed by the explosion of charges charged into the holes drilled near raise axis. Initiation of said charges by means of short-delay blasting is carried out after formation of contour slit during falling of the separated rock block. The holes charged along the raise contour are alternated with non-chargeable ones.

EFFECT: invention makes it possible to reduce the volume of holes drilling for development and provide reliability of raise formation over entire predetermined height per one blast.

2 cl, 5 dwg