2019-5-4

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.

 

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Received 6 August 2018

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