METHOD OF EXPLOSIVE ORE AND ROCK RUPTURE WITHIN UNDERGROUND SURVEY AND OPEN CAST MINING Russian patent published in 2009 - IPC F42D1/00 

FIELD: blasting operations.

SUBSTANCE: invention refers to mining engineering. Method of explosive ore and rock rupture within underground survey and open cast mining includes drilling of parallel-contiguous well bundle, charging and simultaneous blasting. In each parallel-contiguous well bundle, charged wells form modelled surface of cumulative cavity, symmetry axis of which matches path of least resistance. All wells in the bundle outside of this surface, are charged, and all wells inside are not charged. Herewith number N₁ of not charged wells d₁ in internal volume of cumulative surfaces is calculated from the expression: N₁=(k_p-1)(0.5B²-Nd²)/(d²+(k_p-1)d₁ ²), where k_p>1 is degree of fragmentation of blasted rock, B is width of well bundle, m; N is total amount of charged wells in bundle, pc.; d is diameter of charged wells, m; d₁ is diameter of not charged wells, m.

EFFECT: higher application efficiency of parallel-contiguous well bundle energy due to its maximum concentration towards path of least resistance.

2 dwg