ERECTION METHOD OF ARTIFICIAL PEDESTAL-SHAPED PILLARS IN ALLUVIAL WELLS OF PERMAFROST ZONE Russian patent published in 2013 - IPC E21F15/00 E21C41/22 

FIELD: mining.

SUBSTANCE: all pillar erection operations are performed during winter period after the development of cleaning chamber in alluvial well is completed. A vertical well of large diameter (500-600 mm) is pre-drilled from surface above the developed chamber, under which an underground construction of a moving frame is performed; the above frame is filled with crushed rock mixture formed during summer sand flushing at flushing plants and contained in dumps. Then, mixture is compacted by means of vibration machines and warmed up for a short period of time with its being moistened with superheated steam supplied at high pressure from steam-generating plant in quantity of at least 10 m³ per 1 m of the mixture. After that, frozen rock mixture - pedestal-shaped pillar is frozen in addition with cold air induced with a fan, thus providing high compression properties.

EFFECT: invention allows reducing useful mineral losses and water consumption, increasing pillar erection speed and preventing the deformation of ground surface above developed mine field.

1 dwg