Theoretical consideration of plasma energy transfer to the rock mass

• Дата: 2016
• Автори: Makeyev, S.Yu., Osenniy, V.Ya., Ryzhov, G.A., Osennyaya, N.V., Holyavik, O.V.
• Формат: Стаття
• Мова: English
• Опубліковано: Інститут геотехнічної механіки імені М.С. Полякова НАН України 2016
• Назва видання: Геотехнічна механіка
• Онлайн доступ: http://dspace.nbuv.gov.ua/handle/123456789/137793
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Цитувати: Theoretical consideration of plasma energy transfer to the rock mass / S.Yu. Makeyev, V.Ya. Osenniy, G.A. Ryzhov, N.V. Osennyaya, O.V. Holyavik // Геотехнічна механіка: Міжвід. зб. наук. праць. — Дніпропетровск: ІГТМ НАНУ, 2016. — Вип. 128. — С. 139-148. — Бібліогр.: 9 назв. — англ.

The article is devoted to the problem of hard ores, in particular of ferruginous quartzites, thermodynamic destruction with the help of new environmentally friendly and saving-resource technologies of blasting operations in the Kryvyi Rih basin. Until now, no more effective methods have been developed for making underground chambers for explosive substances, than the plasma method, though control of plasma torch thermodynamics remains a live problem. This method allows making chambers of any configurations. The article presents results of theoretical studies of how plasma impacts on the iron ore mass. The dependencies of distribution of temperature loads and normal and tangential stresses in the rock on time and coordinate are specified. It is stated that tensile stresses of magnetic quartzites being treated by plasma is ten times greater than compressive stresses. Calculations, which take into account rock pressure, convective and radiant heat transfer from the plasma jet specify essentially more exactly geometry of stress distribution, time of stress diffusion, density of thermal field in the surface sector of the borehole. Scientific novelty of the presented results lies in justification of models of plasma-flow impact on the iron ore mass in the pre-fracture zone at the borehole expansion. The results can be used in technological processes of breaking hard ores into the camera, during sinking the raise workings and during construction of the cutting slots and other workings for domestic purposes.