| 摘要 |
FIELD: mining.SUBSTANCE: method involves development and temporary workings, sublevel development of ore body in downward direction with rhomb-shaped chambers; with that, development of chambers as to height is performed at three stages. Upper part of the chamber is developed with combine ore crushing, an entry way of rectangular shape with preparation of the chamber roof in the form of an arch, the next underlying layer up to lower border of adjacent stowed chambers is crushed using shrinkage stoping with downholes, thus forming an ore cushion above the non-crushed part of the chamber. Lower half of the chamber, which is adjacent to ore massif, is crushed in sections, by blasting of fans of wells drilled out of the underlying drilling and delivery cross drift. After blasting of each section, partial end ore drawing is performed to the drilling and delivery cross drift with self-propelled bucket loading and transportation machines, which results in loosening of bottom-hole zone. After complete crushing of the chamber reserves, final drawing of crushed ore is performed through the drilling and delivery cross drift using self-propelled loading and transportation machines with remote control. After ore drawing is completed, the chamber is stowed.EFFECT: improving efficiency of underground development; reducing seismic and dynamic action of explosive charges on stowing massif; reducing losses and dilution.3 cl, 6 dwg |
