By Ajoy K. Ghose, Akhilesh Joshi
Blasting practices in mines have passed through many alterations within the fresh previous and remain honed and reconfigured to fulfill the calls for of today’s mining wishes. This quantity compiles papers of the workshop Blasting in Mines – New Trends, hosted through the Fragblast 10 Symposium . The 17 papers offer a combination which spotlight the evolving tendencies in blasting in mines. those diversity from targeted ideas of solid blasting, purposes of seed wave modelling for more suitable fragmentation, to layout of mass blasts and regulated blasting for balance of pit-walls. Blasting in Mines – New Trends might be of specific curiosity to mining and blasting engineers.
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Additional info for Blasting in Mining - New Trends
The new advanced blasting theory based on sonicity enables the blast engineer to design larger blasts without increasing unwanted vibrations while obtaining optimal fragmentation. 1 INTRODUCTION Bragg-grid based strain sensors, 3-component geophones and a 3-D-laser scanner [Mueller & Pippig 2011b]. The evaluation of the re-investigation of these blasting operations led to revolutionizing results and conclusions. Based on the validity of the sonic effect in blasting and explosive technology, the use of a fictitious detonation pressure and other important physical relations relevant to the blasting process yielded new principles for the dimensioning of blast operations.
In general, crushed rock (sized to <1/6 of hole diameter) is the best material because this size range can provide a bridging effect when being pushed by detonation gases but it can still free-flow when poured into the blastholes. For the delay timing in the initiation of a blast, the delay time is aimed at giving sufficient relief between the rings. Usually, the delay time is about 20–30 ms per m of burden. Between blastholes in the same ring, the delay time can be much shorter, usually 5–10 ms per m of Spacing.
E. presplitting has been applied at RAM. The theory of pre-splitting is that when shock waves from simultaneously detonating charges in adjoining blast holes collide, tension occurs in the rock, forming a crack in the web between the holes. Firouzadj et al. (2006) concluded that that small diameter holes in pre-splitting row such as 102 mm using decoupled charges is difficult but whereas continuous charging of the pre-split row in such hole yields better results. Among different approaches of continuous charging (decoupling, explosive mixing) decoupling due to its operation difficulties of small diameter holes (102 mm) was rejected by Jimeno et al.