By Ajoy K. Ghose, Akhilesh Joshi
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Extra resources for Blasting in Mines: New Trends: Workshop Hosted by Fragblast 10: The 10th International Symposium on Rock Fragmentation by Blasting, New Delhi, India, 24-25 November, 2012
Figure 6. Relationship between longitudinal (P) wave speed and shear (S) wave speed of a variety of hard rocks showing the regions of detonation velocity of the most important explosives (ANFO, Heavy ANFO, Emulsion explosives, Gelatin explosives, PETN, TNT). ing conditions whereas ANFO will produce supersonic blasting conditions only in very soft rock where the wave velocities are fairly low. Granite will be the rock of choice in the particular example problem. The diagram shown in Fig. 7 exhibits the sonic effect of a series of selected commercial explosives when used in conjunction with granite in regular blast jobs.
Drilling and blasting of rocks:252–271. Rotterdam: Balkema. , 2009. Controlled blasting (presplitting) at an open pit mine in India, Proc. 9th Fragblast on Rock Fragmentation by Blasting, Granada, Spain, 13–17th Sept 2009, pp 481–489. CONCLUSIONS Blasting is one of the major factor adversely affecting the stability. e. RMR. e. indb 27 10/3/2012 9:35:47 PM Blasting in Mines – New Trends – Ghose & Joshi (Eds) © 2013 Taylor & Francis Group, London, ISBN 978-0-415-62139-7 New physical findings revolutionize the drilling and blasting technology as well as the prediction of ground vibrations—Part 1: The new blasting model B.
Rock Characterization (RMR) Rock condition Explosive charge reduction Normal charge 1 >45 2 30–45 Normal Rock, 40–50 MPa Weak rock 3 30–20 Very weak 4 5 Sheared zone Pegmatite 6 Amphibolite Powdered mass Normal strength, 70–90 MPa Normal strength 90–120 MPa 10–15% reduction, use one bamboo 15–20% lesser, two bamboos No blasting, free dig Normal charge Normal charge Figure 7. Echelon firing pattern, oblique to foliation orientation. Figure 5. Mine plan showing locations of test blasts. explosive charge per hole adjusted judiciously and the blast performance was analysed.