Cartridge for bulling mine holes

Cartridge for bulling mine holes, which is of cylindrical shape, is made of an elastic material and possesses a zone (7) capable of deforming axially and a zone (6) capable of deforming radially, under the effect of a radial or axial pressure exerted on the cartridge or under the effect of an internal pressure variation, characterised in that said zones occupy successive axial portions of said cartridge, the volume of the zone (7) capable of deforming axially is greater than the volume of the zone (6) capable of deforming radially, and said cartridge is constructed to be inserted in a mine hole with said zone capable of deforming axially projecting into the hole and said zone capable of expanding radially bearing against the side wall of the hole, and to respond to an explosion in the hole by axial contraction of said zone capable of deforming axially and radial expansion against the hole wall of said zone capable of deforming radially.