Opencast quarries: vibration assessing methods.

"The proposed work is a prediction of the propagation of seismic waves induced by the cultivation of quarries through the use of explosives. The paper is divided in two different stages: first of all it is necessary to choose, among the various explosives for industrial use and all possible blasting designs, the one with which it would be possible to get an embraceable result from the industrial point of view and with the minimal possible forecasted disturbance for the buildings present in the surrounding areas (receptors); as a second step it was found, with the simulations, the indicative values (for different distances) for the peak particle velocity (PPV - peak particle velocity). In order to work with the values as real as possible, we used the data contained in a draft E.I.A. (Environmental Impact Assessment) of the Lazio Region, regarding the project of a quarry. The optimal blasting design choice was made considering that a substantial amount of the work has to be spent at the foot of each blastholes; therefore, we considered two different types of plughole, one obtained with two different diameters of drilling (the larger for the lower portion of the blasthole) containing only one type of explosive, and another one having the same diameter along its entire length, but containing two different types of explosives.. . Obtained the mine parameters (blasting design), the peak particle velocity (PPV) and its trend was determined, assuming an exponential decaying of the mathematical function f = PPV(t). At the conclusion of the paper “iso − PPV” maps were created regarding the quarry adjacent area.. "