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Review of Blasting Operations of Summit Brick <br />ANALYSES of BLASTING IMPACTS, cont' <br />The magnitude of strain wave energy and induced particle motion decreases as distance <br />from the charge increases. Rock damage is a result of the induced strain, which is generally <br />proportional to the particle velocity. <br /> <br />Stress/Strain Limited Blasthole <br />Wave Front Crushing - in hard rock <br />Radial Cracks from Tangential Stress <br />F~eure 2.4--Process of Radial Fracturing around Explosive Charges <br />Near field damage can be estimated by applying the findings from several carefully <br />controlled blast-induced rock damage studies. Researchers have used many different <br />measuring techniques to predict the rock damage zone-Cracking Radius (CR) is based on <br />the radius (R,) of longitudinal explosive charges. These studies have used core logs, <br />borehole periscopes, permeability tests and various other measures to determine the extent <br />of blast damage. <br />