EXPLOSION METHOD OF ROCK MASSES WITH DIFFERENT STRENGTH VALUES Russian patent published in 2014 - IPC F42D3/04 

FIELD: mining.

SUBSTANCE: method involves drilling of vertical wells of the same diameter in the mass of enclosing rocks and solid inclusions. Selection of the main type of an industrial explosive (IE) is performed based on properties of enclosing rocks, and selection of IE for solid inclusions is performed based on equality of diameters of controlled crushing zones in enclosing rocks and solid inclusions. With that, selection of IE for solid inclusions is performed as per detonation speed D_incl based on the ratio considering tensile strength limits $${\sigma }_{tens}^{incl}$$ and $${\sigma }_{tens}^{eng.r},$$ M_incl and M_encl.r - coefficients determining elastic expansion of a boundary of a camouflet cavity, Poisson ratios ν^incl and ν^encl.r, Young moduli E^incl and E^encl.r, porosities "П"_incl and "П"_encl.r of solid inclusions and enclosing rocks respectively, γ - adiabatic index of detonation products at detonation completion moment, γ₂ - isentropic index of detonation products, parameter of adiabatic ξ and pressure P₀ of detonation products at Jouget point of the applied main type of IE.

EFFECT: improving efficiency and uniformity of crushing of rocks masses with different strength values owing to providing equality of diameters of controlled crushing zones in enclosing rocks and solid inclusions by accounting for a set of the main properties of enclosing rocks, inclusions and the applied IE.

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