Potential rockburst hazard research at the project mining depth at the Valunistoe deposit

The article describes the analytical results on the geological structure of quartz veins, physical and mechanical properties of ore and hard barren rocks and the stress–strain behavior of rock mass of the Valunistoe deposit within the project mining depth range down to 440 m. The analysis of the strain–stress curves obtained in testing of differеn rock samples shows that many types of rocks (vein quartz, tuff, andesite, dacite and rhiodacite) are susceptible to rock bursting. For the rockburst hazard assessment at the deposit, the mathematical modeling of the stress–strain behavior of rock mass is undertaken as a case-study of the cut-and-fill method of mining with regard to the natural stress state of the gravity type. The gravity stresses are low at the depths under analysis, and the natural stresses are therefore incapable to initiate rock bursts. The maximal compressive stresses induced by stoping at the depths down to 400 m are not higher than 0.10–0.43 of the uniaxial compressive strength, which is much lower than the critical stress capable to provoke rock bursts. Thus, it is found that the deposit is beyond the rockburst hazard at the depths down to 400 m below ground surface. The research allows drawing a conclusion that the Valunistoe deposit subjected to mining operations using the adopted geotechnology in the depth range down to 440 m is rockburst nonhazardous.

Keywords: rock bursts, rockburst hazard, stress–strain behavior, cut-and-fill methods, mathematical modeling.
For citation:

Aynbinder I. I., Ovcharenko O. V. Potential rockburst hazard research at the project mining depth at the Valunistoe deposit. MIAB. Mining Inf. Anal. Bull. 2022;(6):35-45. [In Russ]. DOI: 10.25018/0236_1493_2022_6_0_35.

Acknowledgements:
Issue number: 6
Year: 2022
Page number: 35-45
ISBN: 0236-1493
UDK: 622.272:622.274
DOI: 10.25018/0236_1493_2022_6_0_35
Article receipt date: 23.08.2021
Date of review receipt: 15.04.2022
Date of the editorial board′s decision on the article′s publishing: 10.05.2022
About authors:

I.I. Aynbinder1, Dr. Sci. (Eng.), Professor, Head of Department, e-mail: geoexpert@yandex.ru,
O.V. Ovcharenko1, Cand. Sci. (Eng.), Senior Researcher,
1 Institute oh Problems of Comprehensive Exploitation of Mineral Resources of Russian Academy of Sciences, 11020, Moscow, Russia.

 

For contacts:

O.V. Ovcharenko, e-mail: geoexpert@yandex.ru.

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