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One of the major problems associated with exploitation of the copper oredeposit in underground mines in Poland is the local disturbance in a state ofstable equilibrium manifested in a sudden release of strain energy stored inthe deformed rock mass. It occurs mainly in the form of dynamic events whichmay result in rockbursts and roof falls. In order to face this threats, anumber of organisational and technical prevention methods are applied in mines.It should be also noted that the greatest difficulties with the roof controlare observed in the vicinity of active mining fronts, where the highestdeformations are observed. The detonation of explosives generates a propagatingshock wave which may cause a serious damage to a material body that isencountered on its way. Thus, a number of doubts during the mining operationemerged, that simultaneous firing of group of mining faces may have thenegative impact on the condition of applied roof support and condition of roofstrata as well The article discusses geomechanical influence of multi-facesblasting on immediate roof strata condition through the mutual comparison ofthe instrumented bolts monitoring data and the computer simulations results.The numerically assessed stress/strain field in the near vicinity of theblasting works operation has proved to be in close agreement with the fieldmeasured data. In the considered mining conditions both the numerical approachand field strain/stress monitoring indicated the low effect of productionblasting on the immediate roof fall potential.

Roof fall hazard due to blasting activity in the light of numerical modeling and underground measurements