FIELD: mining, particularly underground thick ore body mining with chamber excavation system with goaf filling at large depths in the case of elevated rock pressure.
SUBSTANCE: method involves cutting unloading slot (slot raise) along ore body strike and before chamber stock excavation initiation in massifs of chambers of the first, the second and the third stages; filling the unloading slot with shrinkage ore; connecting unloading slot ends with cleavage cracks in different stages, wherein the cleavage cracks are formed by drilling wells of 100-112 mm diameters spaced apart 1-1,2 m apart along stage boundaries between sublevels so that each second well is blasted. As lying wall and hanging wall converge ore massifs of the first, the second and the third stages are shifted and slide one relatively another along with partial pillar breakage in unloading slots. To block filling material penetration through slot raise excavations passing through pillars, concrete bridges are erected in the slots. After than chambers of the first stage are cut and filled. After drilled cross-drift cutting the second and the third stage massifs are broken on previously driven slot raises.
EFFECT: increased mining safety and filler, improved stability of the first, the second and the third stage ore massifs, as well as contact massifs of lying and hanging walls.
1 dwg
