Analysis of stress waves induced from single hole stemmed blasts

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Blasting in an underground mine produces potentially harmful elastic stress waves that propagate down the walls and back of the entry. Stemming may be used to maximize the effectiveness of an explosive at the face and minimize the magnitude of the elastic waves that propagate down the entry. This study was directed towards establishing a procedure for determining the type of stemming that would be the most effective in accomplishing the task. In studying the effects of stemming on the wave magnitude, two factors were considered: changing the blast location on the face changes the distance to the transducer, and repeated blasting on a single face causes face and roof deterioration that attenuates the strength of the blast wave. These factors were considered in order to allow the characteristics of the waves from the various single hole stemmed blasts to be compared. In addition, a laboratory study was conducted on polymer models of a mine opening to compare stemmed and non-stemmed blasts. Analysis of the data showed that stemmed blasts produce lower energy waves than non-stemmed blasts. © 1987.

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Mining Science and Technology