By Ajoy K. Ghose, Akhilesh Joshi
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Additional info 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
The following notation has been employed in the model shown in Fig. ) [m] nv = number of individual volumina [−] THE NEW BLASTING MODEL A new blasting model was derived within the framework of the research projects. It is beased on ⎛ V ⋅ξ ⎝ SB Figure 4. charge. indb 34 10/3/2012 9:35:51 PM Figure 5. The physico-mechanical model of a blast in a rock mass showing the fundamental objectives such as vibrations, fragmentation and cast (throw off of fragments) of the muckpile (a few relevant mechanical equations containing parameters of advanced blasting theory are inserted in box form).
The amplitude of the detonation pressure PZO can be employed as a parameter to control the fragment size distribution, if one considers the unit volume to be blasted (Figure 13). g. to improve the fragment size distribution • The larger the effective detonation pressure, PZO, is the more intense the fragmentation will turn out. Figure 9. Reduced fragmentation effect associated with a transsonic blasting in a highly jointed rock mass (MetaGreywacke). indb 37 10/3/2012 9:35:55 PM Figure 12. Scheme showing the relationship between fragmentation of the rock mass, excited ground vibrations and the influence of the sonic action (compare Fig.
Relationship between peak particle velocity (vibration) and the fictitious, effective detonation pressure (fragmentation) showing the sonic effect of the new advanced blast model. are directly related to the various different fictitious effective detonation pressure of production blasts if the distance of the measurement site to the detonation site is kept under consideration. Based on the eqs (7–9) the use of the dynamic strain instead of the peak particle velocity as parameter in the analysis of blast ground vibrations is promoted and recommended [Baumann & Mueller 2000, Mueller & Pippig 2011b].