DESTRUCTION OF INVERSIONS BY NATURAL WINDS INSIDE OPEN PIT MINES

The article presents the results of research undertaken by the Moscow Mining University to study destruction of temperature inversions inside open pit mines. The relevance of the study is governed by the requirement to have more accurate assessment of natural ventilation in deep open pit mines given inversion temperature stratification in mined-out voids. One of the basic research methods was physical simulation. To this effect, it was necessary to ensure similarity of temperature gradients in the model and in the reality. The proper criterion was justified. Physical simulation of destruction of inversions by natural wind flows was carried out in the wind channel at the Institute. The objective was to analyze destruction of inversions by different intensity air flows inside open pit mines of different geometrical dimensions subject to preservation of factors of the inversion gradient. As a result, formulas were obtained for finding natural wind velocities under which destruction of the temperature inversion gradient took place inside an open pit mine. The derived relations were checked using data from special meteorological stations arranged at five open pit mines in the Urals. Processing showed good agreement between the actual data and the results calculated using the obtained formulas. It was also found that the velocities of inversion destruction depend on the value of the temperature inversion gradient in zero wind, on the depth of open pit mines, and on the ratio of open pit mine dimensions on ground surface and along the depth. At the average values of the latter ratio, low inversion gradients and open pit mine depths of 200–250 m, at an average, the wind velocities under which inversions are destructed comply with the known classification. When the open pit mines are deeper and the mentioned ratio is lower (urgent ventilation conditions inside open pit mines), the situation is different—destruction of temperature inversions requires surface wind flows of higher intensity.

Keywords

Аerology of open pit mines, meteorology, temperature, physical simulation, similarity criteria, natural ventilation, wind velocity, inversion destruction.

Issue number: 2
Year: 2019
ISBN: 0236-1493
UDK: 622.4
DOI: 10.25018/0236-1493-2019-02-0-14-19
Authors: Dragunskiy O. N.

About authors: Dragunskiy O.N., Candidate of Technical Sciences, Assistant Professor, Senior Researcher, e-mail: odra@umail.ru, Mining Institute, National University of Science and Technology «MISiS», 119049, Moscow, Russia

REFERENCES:

1. Ushakov K. Z., Mikhaylov V. A. Aerologiya kar'erov: Uchebnik dlya vuzov [Aerology of the quarries: Textbook for high schools], Moscow, Nedra, 1985, 272 p.

2. Dragunskiy O. N. Kompleksnyy podkhod pri formulirovanii zadach aerologii kar'erov. Ekologiya i bezopasnost' otrabotki mestorozhdeniy poleznykh iskopaemykh [An integrated approach in the formulation of aerology quarries. Ecology and safety of mining], Gornyy informatsionno-analiticheskiy byulleten’. 2017. Special edition 12, 76 p. [In Russ].

3. Dragunskiy O. N. Nekotorye voprosy obespecheniya kompleksnogo podkhoda pri postanovke zadach aerologii kar'erov [Some of the issues in achieving an integrated approach in the formulation of the objectives of the aerology of quarries], Gornyy informatsionno-analiticheskiy byulleten’. 2018. Special edition 32, pp. 74—79. DOI: 10.25018/0236-1493-2018-6-32-74-79. [In Russ].

4. Claire Holman, Hugh Datson, Mark Dawson, Rachel McHale, Jon Pullen, Srinivas, Matt Ian Stone, Penny Wilson. Guidance on the Assessment of Mineral Dust Impacts for Planning. The Institute of Air Quality Management. May 2016 (v1.1). London, UK, pp. 1—47.

5. Alfred J. Vella, Renato Camilleri. Fine dust emissions from softstone quarrying in Malta Department of Chemistry, University of Malta. Xjenza, 2005, pp. 47—54.

6. Labile-Tokpa Nieba. Obosnovanie parametrov tekhnologii i organizatsii gornykh rabot po razrabotke mestorozhdeniy poleznykh iskopaemykh otkrytym sposobom v usloviyakh tropicheskogo klimata [Substantiation of parameters of technology and organization of mining works on the mining of mineral deposits by open method in a tropical environment], Candidate’s thesis, Moscow, RUDN, 1994, 15 p.

7. Alosmanov M. S., Mammadov V. A., Khalilova H.Kh., Bayramov C. M. Development of an Effective Method for Preventing Dust Pollution in Stone Quarries Using Petroleum Refinery Wastes. Journal of Environmental Protection, 06, 2015, p. 1118—1123. DOI: 10.4236/jep.2015.610098.

8. Ogbodo S., Oti M., Okeke A., Okafor C. Pneumoconiosis among quarry workers in a metropolitan town in Southeastern Nigeria, International journal of environmental sciences, Vol. 3, No 5, 2013, pp. 1437—1445. DOI: 10.6088/ijes.2013030500014.

9. Dragunskiy O. N. Issledovanie razrusheniya inversiy v kar'erakh [Research of destruction of inversions in the open pits], Candidate’s thesis, Moscow, MGI, 1978, 18 p.

10. Gindin L. S. Osnovy dinamicheskoy meteorologii [Fundamentals of dynamic meteorology], Leningrad, GIMIZ, 1955, 648 p.

11. Bitkolov N. Z., Nikitin V. S. Usloviya truda i provetrivanie kar'erov po dobyche radioaktivnykh rud [Working conditions and ventilation of quarries for the extraction of radioactive ores], Moscow, Atomizdat, 1978, 184 p.

12. Akhmetov M. S., Iskvarina Z. K. Rezul'taty aerometeorologicheskikh issledovaniy temperaturnogo i vetrovogo rezhima v Korkinskom kar'ere [Results of aerometeorologikal studies of temperature and wind conditions in the Korkinskoye quarry], Sbornik rabot Sverdlovskoy GMO, issue 10. Sverdlovsk, 1970, pp. 102—105.

13. Kulikov V. P., Rogalis Yu. P. Provetrivanie ugol'nykh razrezov [Ventilation of coal open pit mines], Moscow, Nedra, 1973, 224 p.

Subscribe for our dispatch