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PARTICULARITIES OF DESTRUCTION OF OUT-CONTOUR ROCK MASS ASSOCIATED WITH BLASTING THE SYSTEM OF BOREHOLE CHARGES
Abstract
The authors have revealed particularities in destruction of the rock mass by the system of borehole charges and substantiated the least seismic hazardous blasting schemes which allow decreasing out-contour disturbances and providing more qualitative crushing of rock mass. It has been shown that for the boreholes with 250 mm diameter the least seismic hazardous blasting scheme is one with borehole line placed at the angle of 105пїЅ to the bench wall. At that, the stress level in the out-contour rock mass decreases by 20-30% compare to other breaking directions. It has been revealed that blasting of the second and consequent lines results in increase of a fissuring zone in the out-contour rock mass due to induced fracturing from the first line blast; but mainly extension of the fissuring zone is typical for schemes with location of borehole lines at the angle of 75 ? 90пїЅ to the bench wall.
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