LABYRINTH® micro-scale damage (conditioning) quantification method was used to quantify the extent and degree of intact damage due to a fully confined blast hole. Using x-ray microtomography produced microfracture statistics from core samples taken before and after the blast, it was possible to delineate a blast damage radius. Over 40,000 microfractures, from 32 samples were analysed using LABYRINTH®. Provisional patent file number: 2015901392.
X-ray microtomography samples taken from within 3-4m of a 165mm fully confined blast hole, have 26% of the total microfracture volume greater than 30 voxels, compared to only 6% for samples beyond 4m from the blast hole (highly significant p value <0.000*). In other words, blasting induced intact rock damage, increases the number, and volume of large microfractures. As shown in the table below, the cumulative percent volume results have been used to quantify the effect of confined blasting on intact rock damage (preconditioning). The P50, P80and P90 statistics for cumulative % microfracture volume shown below, is just one, of several LABYRINTH®
statistical methods used to quantify significant levels of blast damage preconditioning within 3-4m of the blast hole.