Prediction of thermostabilization of wet slide rocks at the bottom of open pit mine in the permafrost zone using seasonal coolers

Authors: Romanova E. K.

The study focuses on safety of underground kimberlite mining under open pit mines in the permafrost zone. The article describes research findings on stability and waterproofing of wet slide rocks on the bottom of an open pit after freezing using seasonal coolers. For the method efficiency evaluation and its implementation optimization, the 3D mathematical model of heat processes in manmade water body and in wet slide rocks on the pit bottom, as well as in the crown pillar under the pit is constructed with regard to the phase transition of moisture and to the influence of seasonal coolers. The mathematical model uses the finite element method, is implemented as Microsoft Windows application and enables long-term prediction of temperature field in slide rocks depending on various process variables of freezing by seasonal coolers. The numerical experiments are carried out as a case-study of Internatsionalny open pit kimberlite mine. The research findings on optimization of seasonal cooling toward enhanced freezing of slide rocks on the pit bottom are presented. The research proves efficiency of seasonal coolers in stimulation of freezing stabilization of wet and salt slide rocks on the bottom of the mined-out pit in the permafrost zone. In the course of time, steady-state negative temperature sets in the frozen rock mass, which allows shutdown of seasonal coolers. Slide rocks on the pit bottom keep frozen in the ensuing years and gradually come into natural temperature regime.

Keywords: open pit mine, permafrost zone, thermostabilization, stability, temperature regime, mathematical model, seasonal cooler.
For citation:

Romanova E. K. Prediction of thermostabilization of wet slide rocks at the bottom of open pit mine in the permafrost zone using seasonal coolers. MIAB. Mining Inf. Anal. Bull. 2021;(12—1):183—194. [In Russ]. DOI: 10.25018/0236_1493_2021_121_0_183.

Acknowledgements:
Issue number: 12
Year: 2021
Page number: 183-194
ISBN: 0236-1493
UDK: 537:622.012.3:624.121 [551.34]
DOI: 10.25018/0236_1493_2021_121_0_183
Article receipt date: 18.07.2021
Date of review receipt: 29.10.2021
Date of the editorial board′s decision on the article′s publishing: 10.11.2021
About authors:

Romanova E. K., Cand. Sci. (Eng.), Researcher, Chersky Mining Institute of the North, Siberian Branch, Russian Academy of Sciences, Yakutsk, Russia.

For contacts:

Romanova E. K., e-mail: helconst@mail.ru

Bibliography:

1. Zarovnyaev B. N., Akishev A. N., Shubin G. V., Budikina M. E., Sobakina M. P. Technology of final extraction of the reserves of deep diamond quarries using mining equipment with remote control. 19th International Multidisciplinary Scientific GeoConference SGEM. 2019. pp. 629—634.

2. Ajnbinder I. I., Packevich P. G., Krasyukova E. V. Justification of the parameters of hazardous zones in the combined development of kimberlite deposits in Yakutia. Izvestiya Tul’skogo gosudarstvennogo universiteta. Nauki o Zemle. 2019. no. 3. pp. 48—60. [In Russ].

3. Mal’ceva I. A. Justification and selection of parameters for mining the under-pit reserves of the Mir pipe. MIAB. Mining Inf. Anal. Bull. 2002. no. 7. pp. 120—123. [In Russ].

4. Saharov I. I., Paramonov V. N., Paramonov M. V., Igoshin M. E. Deformations of frost heaving and thawing of soils during operation and damage to seasonal cooling devices. Promyshlennoe i grazhdanskoe stroitel’stvo. 2017. no. 12. pp. 23−30. [In Russ].

5. Cybin S. S. Review of MMG thermal stabilization systems and evaluation of the thermal stabilizer performance under specific climatic conditions. Alleya nauki. 2017. Vol. 2. no. 9. pp. 432−439. [In Russ].

6. Lihachev E. S., Molchanov S. A. Methods of thermal stabilization of permafrost soils and the development of promising installations for freezing soils. Akademicheskaya publicistika. 2018. no. 10. pp. 14−19. [In Russ].

7. Choi S, Lee S, Son K and Kim Y. The effects of operation variables on the cooling seasonal efficiency of a residential air conditioner with an inverter compressor ACRA. 8th Asian Conference on Refrigeration and Air-Conditioning. 2016.

8. Filimonov M., Vaganova N. Numerical simulation of technogenic and climatic influence on permafrost. Advances in Environmental Research. Volume 54, edited by J. A. Daniels (Nova Science Publishers, New York, 2017). pp. 117–142.

9. Vaganova N. A. Simulation of thermal stabilization of bases under engineering structures in permafrost zone. Proceedings of the 44th International Conference on Applications of Mathematics in Engineering and Economics. 2018. С. 030010.

10. Vaganova N. A., Filimonov M. Y. Simulation of cooling devices and effect for thermal stabilization of soil in a cryolithozone with anthropogenic impact. Lecture Notes in Computer Science. 2019. Т. 11386 LNCS. pp. 580—587.

11. Hoholov YU. A., Kurilko A. S., Solov’ev D. E. Calculation of the temperature field of saline rocks in the mouth of the vertical shaft during the operation of the freezing system. Fiziko-tekhnicheskie problemy razrabotki poleznyh iskopaemyh. 2016. no. 3. pp. 176—184. [In Russ].

12. Romanova E. K., Hoholov YU. A., Kurilko A. S. Modelirovanie termostabilizacii gruntov osnovaniya bloka biologicheskoj ochistki stochnyh vod (BBO) v usloviyah vechnoj merzloty [Modeling of thermal stabilization of soils of the base of a biological wastewater treatment unit (BSS) in permafrost conditions ], Teplofizika i energetika arkticheskih i subarkticheskih territorij. Rasshirennye tezisy dokladov Vserossijskoj nauchno-prakticheskoj konferencii s mezhdunarodnym uchastiem. Yakutsk, In-t merzlotovedeniya im. P. I. Mel’nikova SO RAN Publ, 2019. рр. 384−387. [In Russ].

13. Romanova E., Khokholov Yu. Maintaining thermal stability of a fill slone in cryolitozone. E3S Web of Conferences 192. VIII International Scientific Conference “Problems of Complex Development of Georesources”, EDP Siences. 2020. С. 01021. DOI: 10.1051/e3sconf/202019201021.

14. Efimov V. M., Vasil’chuk YU. K., Rozhin I. I., Popenko F. E., Stepanov A. V. Modeling the temperature regime of soil foundations with seasonal cooling devices in the permafrost zone of the Republic of Sakha (Yakutia). Arktika i Antarktika. 2017. no. 4. pp. 86−97. [In Russ].

15. Tihonov, A. N., Samarskij A. A. Uravneniya matematicheskoj fiziki [Equations of mathematical physics]. Moscow, Nauka Publ, 1977. 736 p. [In Russ].

Our partners

Подписка на рассылку

Раз в месяц Вы будете получать информацию о новом номере журнала, новых книгах издательства, а также о конференциях, форумах и других профессиональных мероприятиях.