Peculiarities of initial stress fields in lode deposits in the permafrost zone

The article presents the main results of the research over the period from 2003 to 2020 into the initial stress–strain behavior of 8 lode deposits located in the permafrost zone: in the area of the Chukotka folded region, on the Patamian Plateau, in the south of the TransBaikal Territory and in the Eastern Sayan Mountains. The initial stresses were measured at different temperatures of the mine fields: in the upper layer of permafrost rocks, in completely thawed rocks underlying the permafrost strata and in the transition zone at the permafrost– thawed rock interface. All measurements were taken by the co-authors over the period from 2003 to 2020 using the procedure developed at the Institute of Mining, Ural Branch of the Russian Academy of Sciences, using semi-circular and segmented borehole slotting. The general patterns of the initial stresses in the permafrost are found. The stresses in frozen rocks are close to the hydrostatic stress distribution; in the transition zone and in thawed rocks, the stresses fit with the gravitational–tectonic stresses. The average values of the lateral earth pressure coefficient are obtained for different temperature conditions: 0.9–1.1 in frozen rocks, 1.2–1.5 in the transition zones and 1.5–1.8 in thawed rocks on the lower mine horizons. The percentage of the cryo-tectonic components in the total structure of the initial stress field is assessed. The influence of perennial permafrost is 100 % of the vertical stresses, and the influence of tectonics is 150 %. The results obtained are proposed to be used as the boundary conditions in engineering calculations and in mathematical modeling of stable mine structures design and operation of lode deposits in the permafrost zone with unexplored natural stresses and strains.

Keywords: gold ore veins, permafrost, rock temperature regime, full-scale measurements, borehole slotting, initial stresses, stress distribution, tectonic stresses, cryogenic stresses, lateral earth pressure coefficient.
For citation:

Sosnovskaya E. L., Avdeev A. N. Peculiarities of initial stress fields in lode deposits in the permafrost zone. MIAB. Mining Inf. Anal. Bull. 2021;(5—2):162—173. [In Russ]. DOI: 10.25018/0236_1493_2021_52_0_162.

Acknowledgements:

The study was carried out under State Contract No. 075-00581-19-00, Topic No. 0405-2019-0007.

Issue number: 5
Year: 2021
Page number: 162-173
ISBN: 0236-1493
UDK: 622.831
DOI: 10.25018/0236_1493_2021_52_0_162
Article receipt date: 15.12.2020
Date of review receipt: 15.02.2021
Date of the editorial board′s decision on the article′s publishing: 10.04.2021
About authors:

Sosnovskaya E. L.1, Cand. Sci. (Geol. Mineral.), Senior Research Worker;
Avdeev A. N.1, Cand. Sci. (Eng.), Senior Research Worker, e-mail: avdeev0706@mail.ru;
1 Institute of Mining of the Ural Division of Russian Academy of Sciences, Ekaterinburg, Russia.

 

For contacts:
Bibliography:

1. Sosnovskaia E. L., Avdeev A. N. Control over the geotechnical processes at the goldfields of Eastern Siberia (in english). Izvestiya vysshikh uchebnykh zavedenii. Gornyi zhurnal = News of the Higher Institutions. Mining Journal. pp. 21—29 [In Eng.]. DOI: 10.21440/0536—1028—2019—5-21—29 (2019)

2. Pavlov, A. M. Study of the cryolithic zone and its influence on the geomechanical state of the rock mass at underground mining of gold deposits in Buryatia. Proceedings of the Siberian Branch of the Earth Sciences Section of the Russian Academy of Natural Sciences. Geology, prospecting and exploration of ore deposits. 2012. no. 1(40). pp. 53—61 [In Russ]

3. Avdeev A., Sosnovskaya  E.  Geomechanical  conditions  of  veingold  deposits in permafrost zone. DOI: https:. doi.org/10.1051/e3sconf/202019201026. E3S Web of Conferences : VIII International Scientific Conference “Problems of Complex Development of Georesourcef” (PCDG 2020), Khabarovsk, Russia Federation, September 8—10, 2020 г. 2020. Vol. 192. p. 01026.

4. Pavlov A. M. Sovershenstvovanie tekhnologii podzemnoj razrabotki zhil’nyh mestorozhdenij zolota [Upgrading the technology of gold deposits underground mining]. Irkutsk: Irkutsk State Technical University 128 p. (2013) [In Russ]

5. Razumov E. A., Eremenko V. A., Zayatdinov D. F., Matveev A. C., Grechishkin P. V., Pozolotin A. C. Calculation of rock bolting parameters for mine roadways in permafrost rocks. MIAB. Mining Inf. Anal. Bull., 2013, no. 9, рр. 39—47. [In Russ]

6. Pavlov A. M., Semenov Iu. M., Sosnovskii L. I. Evaluation of parameters of stable pillars and room roofs in underlay lode mining in cryogenic zones in terms of the Irokindinsly gold deposit. MIAB. Mining Inf. Anal. Bull. 2014; 10: 21—27. [In Russ]

7. Fedolyak A. A., Pavlov A. M. Obosnovanie parametrov effektivnoj podzemnoj razrabotki Majskogo mestorozhdeniya [Justification of the Mayskye deposit effective underground mining parameters / Proceedings of the sixteenth all-Russian scientific-practical conference “Problems of economy and business development”. 2018. pp. 98—104. [In Russ]

8. The ISRM Suggested Methods for Rock Characterization, Testing and Monitoring: 2007—2014. Under the editorship of R. Ulusay, Springer International Publishing Switzerland, Cham. 2015, 293 p.

9. Vlokh N. P. Upravlenie gornym davleniem na podzemnyh rudnikah [Rock pressure control at underground mines]. Moscow: Nedra Publishing; 1994. 208 p.[In Russ]

10. Zubkov A. V. Geomekhanika i geotekhnologiya [Geomechanics and Geotechnology]. Ekaterinburg: Uro RAS, 2001. 335 p. [In Russ]

11. Wilhelm Rust. Non-Linear Finite Element Analysis in Structural Mechanics/ Switzerland: Springer International Publishing. 2015. 363 p.

12. Moatamedi M., Hassan A. Khawaja. Finite Element Analysis. Boca Raton: CRC Press. 2018. 154 p.

13. Pavlov A. M. Controllable roof rocks selfcollapse of used purification space (Irokindinsk deposit being considered as an example) [Controllable roof rocks selfcollapse of used purification space (Irokindinsk deposit being considered as an example)]. The 8th International Forum for Strategic Technology 2013.Proceedings IFOST 2013.Ulaanbaatar, Mongolia: Mongolian University of Science and Technology, 2013. pp. 574—575. [In Eng.]

14. Sosnovskaia E. L., Avdeev A. N. Evaluation of the initial stressed state of rocks in the cryolitzone (on the example of Irokindinsky mining). MIAB. Mining Inf. Anal. Bull. 2020, 3—1. pp. 208—215. [In Russ]

15. Neganov, V. P., Kovalenko V. I., Zaitsev, B. M., Sosnowski, L. I. Tekhnologiya razrabotki zolotorudnyh mestorozhdenij [Technology of the gold fields mining]. Under the editorship of V. P. Neganov. Moscow: Nedra Publishing, 1995. 336 p. [In Russ]

16. Sosnovsky L. I. Estimation of parameters of the steady pillars and chamber roof at development of the steep-falling gold ore veins at great depths. Vestnik ISTU, 2007. no. 1, Vol. 2. pp. 63—66 [In Russ]

17. Forecast and prediction of rockburst at the mines: a collective monograph / under the general editorship of I. M. Petukhov, A. N. Ilyin, K. N. Trubetsky. Moscow: AGN Publishing House. 1997. pp. 351—367 [In Russ]

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.