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The paper presents numerical modelling results for ventilating a blind excavation, if there is a leakage into a failure zone. The leakage value of air seeping through the failure zone (binomial law of resistance) was estimated by a formula describing in-situ tests results at the Kola Peninsula mines. The blind excavation ventilation process was simulated based on a previously developed two-stage methodical approach: 1st stage пїЅ calculation of aerodynamics with applying a standard ?k ?? ? -turbulence model; 2nd s...

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 ...