The close-range zone in rock blasting
- 40 Downloads
Pulsed x-ray photography enables us to determine the profile of the shock wave in a graph of mass velocity vs time at distances of 1–3 times the charge radius from its center in rocks of various acoustic impedances.
The quantity of energy transmitted to the rock in the blast is a considerable fraction of the potential energy of the explosives and increases with the power (detonation velocity) of the explosives in rocks of various hardnesses.
In breaking rocks with high acoustic impedance, it is advisable to increase the energy transfer factor from the explosives to the rock by increasing the charge power.
KeywordsShock Wave Explosive Acoustic Impedance PETN Detonation Velocity
Unable to display preview. Download preview PDF.
- 1.Ya. B. Zel'dovich and Yu. P. Raizner, The Physics of Shock Waves and High-Temperature Hydrodynamic Phenomena [in Russian], Fizmatgiz, Moscow (1963).Google Scholar
- 2.V. M. Komir et al., in: Utilization of Blasting in the National Economy [in Russian], Pt. 2 Naukova Dumka, Kiev (1970).Google Scholar
- 3.I. V. Belinskii and B. D. Khristoforoy, Zh. Prikl. Mekhan., Tekh. Fiz., No. 1 (1968).Google Scholar
- 4.B. D. Khristoforov et al., FGV,7, No. 4 (1971).Google Scholar
- 5.V. P. Belyatskii and V. Ya. Bril', in: The Mechanism of Rock Breaking by Blasting [in Russian], Naukova Dumka, Kiev (1971).Google Scholar
- 6.A. N. Khanukaev, The Energy of the Shock Waves in Rock Breaking by Blasting [in Russian], Gosgortekhizdat, Moscow (1962).Google Scholar