Mining Institute, Ural Branch, Russian Academy of Sciences (Perm, Russia)1 ; Perm National Research Polytechnic University (Perm, Russia)2
A. G. Isaevich, Chief Researcher1, Head of Department2, Doctor of Engineering Sciences, Associate Professor
Mining Institute, Ural Branch, Russian Academy of Sciences, Perm, Russia
S. V. Maltsev, Head of Sector, Candidate of Engineering Sciences
A. V. Shalimov, Leading Researcher, Doctor of Engineering Sciences I. I. Kozunin, Engineer, ilya.kozunin@yandex.ru
N. A. Trushkova, Leading Engineer, Candidate of Engineering Sciences
Sustained growth of production capacities in underground mineral mining conditions formation of extended and branched ventilation networks at deep levels in mines. Such networks feature a high air drag and a large number of ventilation devices. In the normal ventilation conditions, these odds are evened by auxiliary air draught sources and ventilation facilities. However, transition to reversible ventilation completely re-arranges aerodynamic system of a whole mine. In case of reversal, re-distribution of air pressure and air flow rate takes place in underground openings, air drags of ventilation facilities change because of their asymmetry, and auxiliary sources of air draught switch off. It is required to develop a science-based approach to determination of the required percentage of reversal. The authors propose the differentiated approach to estimation of the required air flow rate in the reversal ventilation, based on the criteria of gas emission, air jet stability and minimal allowable velocity. The studies show that even for gas-hazardous mines, the defining value of the gas emission criterion in calculation of the required air flow rate in the reversal ventilation should be stated with regard to t he actual intensity of gas emission. In non-gassy mines, the governing criteria are the air j et stability and minimal allowable velocity. The proposed approach helps switch from the universal regulatory standards to the science-based determination of the reversal ventilation parameters with an eye on specifics of a certain mine.
The study was supported by the Ministry of Science and Higher Education of the Russian Federation within the framework of state contract, R&D State Registration No. 126012716039–2.
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