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.

Acknowledgements:
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:
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