METHOD FOR FORMING AND DEVELOPING ELONGATED DIRECTED CRACKS IN MINERAL AND ARTIFICIAL MATERIALS Russian patent published in 2005 - IPC

FIELD: mining industry and building, particularly methods or devices for rock dislodging.

SUBSTANCE: method involves creating weakened areas in material; sealing the weakened area; pumping pressurized working agent into weakened material. Before weakened area forming at least two holes are drilled in the material so that holes reach plane of further material breaking. At least three heating members are arranged in the holes along weakened area perimeter. Weakened area creation is performed in area of following material breaking by local material heating to form crack between adjacent holes. Working agent pumping is performed until crack reaches free surface. Distance between adjacent holes is not less than 0.1 m and is not more than 1.2 m. Material is heated up to temperature of not more than 1200°C. Gas or liquid or superheated vapor obtained during liquid feeding to local heated zone of the material or explosive gas may be used as the working agent. Material is heated by means of electric heaters or by thermit mixture.

EFFECT: increased accuracy of crack orientation.

10 cl, 4 dwg