Energy Release Characteristics of Explosives and Their Impact on Blast Results
The recent advancements in detonation process are noteworthy, but they are still based on somewhat hypothetical situations. The actual variables that are essential parts of normal blasting practice have not yet been taken into account in such treatments. These include the various initiation practices employed to detonate a column of explosive, from single point initiation to multi-point initiation in a blast holes, and effect on detonation characteristics of both detonators and explosives under multi-deck and multi-hole blasting condition. The in-the-hole VOD of an industrial explosives is dependent on explosives charge diameter and borehole diameter. The relationship between borehole diameter and VOD provides a fundamental guideline to the rate of energy conversion and energy release within the detonation head on the interaction of explosives with the confining medium. The in-the-hole VOD of explosives was measured at four experimental sites in India for different borehole diameter i. e. 150mm to 311mm but for identical explosives composition of same particle size, density, viscosity and loaded into borehole with same degree of confinement The results of the studies demonstrated that there is definite relationship in in-the-hole VOD of explosives and the diameter of the blast hole. The study also confirmed that the explosives initiated with concentrated boosters yielded higher VOD in comparison to those explosives which were initiated at multi-point priming. The measured increase in VOD of explosives for increasing diameter of holes was up to 24 %. The minimum diameter for steady state detonation velocity for large diameter Non-Permitted and Bulk explosives product may be approximated as 83mm. The rate of change in in-the-hole VOD of explosives with drill diameter decreases with increasing borehole diameter. It can be further stated that the in-the-hole VOD of explosives reaches a fairly constant value after reaching a limiting/threshold diameter of 311mm.
P.K.Singh M.P.Roy A.Sinha
Blasting Research Group, Central Institute of Mining & Fuel Research , India
国际会议
厦门
英文
95-103
2011-08-10（万方平台首次上网日期，不代表论文的发表时间）