УДК 622.271:622.277.6(047.31)
DOI: 10.21440/0536-1028-2019-5-30-36


Borovkov Iu. A., Iakshibaev T. M. Theoretical studies of changes in fracture zones radius in
the ore pile of heap leaching with camouflet blasthole charge explosion. Izvestiya vysshikh uchebnykh zavedenii. Gornyi zhurnal = News of the Higher Institutions. Mining Journal. 2019; 5: 30–36 (In Russ.). DOI: 10.21440/0536-1028-2019-5-30-36

Introduction. Multi-tiered ore pile heap leaching process improvement is possible by using new rational methods, including a method of intensifi cation by means of shaking a multi-tiered ore pile by an explosion of a camoufl et cylindrical borehole charge. This method is acceptable if the concentration of gold in the productive solution gradually reduces, and also if clogging zone is formed. It is necessary to shake a multitiered ore pile with explosions of camoufl et borehole charges, thus moving, grinding, delimiting and changing the orientation of rock pieces in the depth of a multi-tiered ore pile with the formation of additional micro and macro cracks.
Research aim is to determine the radiuses of fracture zones in heap leaching ore pile upon the explosion of a camoufl et blasthole charge.
Methodology includes the determination of the eff ect of the explosion of a camoufl et blasthole charge on the intensifi cation of gold heap leaching process with the use of mathematical simulation.
Summary. A mathematical model of the action of a camoufl et explosion of a cylindrical borehole charge has been developed, which describes fracture zones in the depth of the rock massif of heap leach ore pile. It has been stated that during the explosion of a camoufl et borehole cylindrical charge, under the action of a shock or refl ected shock waves of stress, from the free surface of a bench, fracture zone is formed in the depth of the rock massif of heap leach ore pile. The radius has been determined of a fracture zone depending on the radius of a camoufl et charge, the coeffi cient determining the blasting conditions, massif acoustic stiff ness, Poisson coeffi cient, and the coeffi cient of heap leach rock tensile strength.

Key words: fracturing radius; ore pile; explosion; camoufl et cylindrical borehole charge; radial stress; rock mass; borehole charge radius.



1. Zhigur L. Iu., Mezin A. I. Study of rock explosive loading mechanism in the zone of undercharge in
a well. Vzryvnoe delo = Explosion Technology. 1984; 86/43: 221–225. (In Russ.)
2. Cook M. A. The science of industrial explosives. USA, IRECO Chemicals, 1974. 449 p.
3. Rakishev B. R. Power intensity of rock disintergation. Almaty: Baspager Publishing; 1998. (In Russ.)
4. Rodionov V. N. et al. Mechanical eff ect caused by an underground explosion. Moscow: Nedra
Publishing; 1971. (In Russ.).
5. Kutuzov B. N., Rubtsov V. K. The physics of explosive loading as applied to blasting operations.
Vzryvnoe delo = Explosion Technology. 1963; 53/10: 31–36. (In Russ.)
6. Belenko F. A. Investigation of stress fi elds and the process of fi ssures generation during column charges
blasting in hard rock. In: Problems of the theory of rock destruction under the action of a blast. Мoscow:
AS USSR Publishing; 1958. p. 126–139. (In Russ.)
7. Kingery C. N., Shumacher R. N. and Ewing W. O. International Pressures from explosions in suppressive
structures. BRL. In from Memorandum report № 403. Aberdeen Proving ground, Mariland, 2005.
8. Esparza E. D., Baher W. E. and Oldham G. A. Blast pressures inside and outside suppressive structures.
Edgewood Arsenal Contraction Report EM-CR-76042. Report no. 8. 2005.
9. Pokrovskii G. I., Fedorov I. S. Percussion blow action in deformed environments. Мoscow: Stroiizdat
Publishing; 1957. (In Russ.)
10. Iliakhin S. V., Norov A. Iu., Iakshibaev T. M. Determining the radius of rock fracture zones under the
camouflet explosion. Vzryvnoe delo = Explosion Technology. 2016; 116/73: 29–36. (In Russ.)
11. Nikitin L. V., Odintsev V. N. A dilatancy model of tensile macrocracks in compressed rock. Fatigue &
Fracture of Engineering Materials & Structures. 1999. Vol. 22. Nо. 11. P. 1003–1009.
12. Rodionov V. N. Studying the propagation of a void under the camouflet explosion. Vzryvnoe delo =
Explosion Technology. 1974; 64/21: 5–25. (In Russ.)
13. Wefbull H. R. W. Pressures recorded in partially closed chambers at explosion of TNT charge. Annals
of the New York Academy I of Sciences. 2008. 152. Article 1. P. 356–361.
14. Rakishev B. R., Rakisheva Z. B., Auezova A. M. Speed and time of cylindrical explosion chamber
expansion in the rock mass. Vzryvnoe delo = Explosion Technology. 2014; 111/68: 3–17. (In Russ.)
15. Mosinets V. N. Crushing and earthquake activity of a blast in rocks. Moscow: Nedra Publishing; 1976.
(In Russ.)

Received 6 August 2018



This email address is being protected from spambots. You need JavaScript enabled to view it.


счетчик посещений