Evaluation of the initial stressed state of rocks in the cryolitzone (on the example of Irokindinsky mining)

In 2014—2017 at the Irokinda mine, due to the transition to new technological equipment, the thawing of permafrost rocks began, accompanied by manifestations of rock pressure. There was an urgent need to clarify the changed geotechnical conditions and evaluate the initial stresses of the rock mass. During the study, in situ stresses were measured for various cryogenic conditions of rocks: in permafrost, in transition zones of frozen rocks to thawed, thawed rocks. The measurements were made according the method of slotted relief based on the IM UB RAS by the author’s version of the segmented slot. It is established that in the Irokinda ore deposit rocks there is a change in the stress field structure in the process of both natural and anthropogenic rock melting. In the process of rock thawing vertical stresses increase slightly, horizontal stresses increase by 40—60%. The tectonic component of the premining stresses increases several times from –1,8 MPa to –22,9 MPa. The research results are confirmed by full-scale initial stresses measurements of a number of permafrost zone deposits: Mayskoye, Novo-Shirokinskoye, Konevinskoye. For an objective evaluation of the pre-mining stress-strain state of the deposits located in the permafrost zone, it is necessary to carry out their temperature zoning. To increase the safety of mining, it is recommended to use technological measures to prevent the thawing of the rock mass. Based on the research results, a Conclusion of rockburst hazard and gas-dynamic manifestations at the Irokinda gold ore deposit (2017) was written.

Keywords: geotechnical conditions, initial pre-mining stresses, full-scale measurements, permafrost, rock temperature, gold veins, gravitational and tectonic stress components, forecast and prediction of rockburst.
For citation:

Sosnovskaya 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): 208-215. [In Russ]. DOI: 10.25018/0236-1493-2020-31-0-208-215.

Issue number: 3
Year: 2020
Page number: 208-215
ISBN: 0236-1493
UDK: 622.831
DOI: 10.25018/0236-1493-2020-31-0-208-215
Article receipt date: 21.11.2019
Date of review receipt: 07.02.2020
Date of the editorial board′s decision on the article′s publishing: 20.03.2020
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 The Institute of Mining of the Ural branch of the Russian Academy of Sciences, 620075, Ekaterinburg, Russia.


For contacts:

1. Sosnovskaia E.L., Sosnovskii L.I., Avdeev A.N. Study of the geomechanical conditions of flat and inclined thin ore veins in permafrost gold mine irokindinskoye. Vestnik Irkutskogo gosudarstvennogo tekhnicheskogo universiteta. 2015; 10: 99–107. [In Russ]

2. Sosnovskaia E.L. Rationale for the parameters of underground geotechnology of low thickness inclined lodes development. Vestnik Irkutskogo gosudarstvennogo tekhnicheskogo universiteta. 2015; 5: 60–68. [In Russ]

3. 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]

4. Semenov Yu.M. Temperaturnyi rezhim gornogo massiva v kriolitozone na rudnike «Irokinda» [Temperature conditions of permafrost rock mass at “Irokinda” mine]. Problemy osvoeniya mineral’noi bazy Vostochnoi Sibiri [Development of Eastern Siberia’s mineral resources]. Irkutsk: Irkutsk State Technical University Publ., 2009, рр. 228–231. [In Russ].

5. Pavlov A.M., Semenov Iu. M., Sosnovskii L.I. Upravlenie gornym davleniem v mnogoletnemerzlyh massivah pri podzemnoj razrabotke naklonnyh zhil maloj moshchnosti Irokindinskogo zolotorudnogo mestorozhdeniya [Rock pressure control in permafrost massifs under low thickness inclined lodes underground mining at Irokindinskii gold field]. In: Geodynamics and Stress state of the Earth’s interior: scientific conference proceedings. Novosibirks: IM SB RAS Publishing; 2008. pp. 477–481. [In Russ]

6. Walter Wittke Rock Mechanics Based on an Anisotropic Jointed Rock Model (AJRM). Wilhelm Ernst & Sohn, Berlin, 2014, 865 p.

7. Baotang Shen, Ove Stephansson, Mikael Rinne. Modelling Rock Fracturing Processes. Springer, Dordrecht, 2014, 173 p.

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. Chunlai Wang. Evolution, Monitoring and Predicting Models of Rockburst. Springer, Singapore, 2018, 188 p.

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

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

12. 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. Izvestiya Sibirskogo otdeleniya RAEN. Geologiya, poiski i razvedka rudnyh mestorozhdenij. 2011. no 1(40). pp. 53—61. [In Russ]

13. Sosnovskaia E.L., Iasychenko V.B. Justification of the matrix of natural stresses of vein deposit rock massifs in Siberia and Far East. Vestnik Irkutskogo gosudarstvennogo tekhnicheskogo universiteta. 2011; 11: 74–78. [In Russ]

14. 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. 336 p. (1995). [In Russ]

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