Potential rockburst hazard on lower levels of the Shanuch deposit

Authors: Айнбиндер И. И., Овчаренко О. В., Пацкевич П. Г. 

The geological structure, physical and mechanical properties as well as variation in the stress–strain behavior of rock mass in the course of extraction of copper–nickel sulfide ore reserves from the bottom of opencast mine by the underground method at the Shanuch deposit is analyzed in order to access and mine lower level reserves (depth to 500 m below ground surface). Rockbursthazardous enclosing rocks (bastard granite and gabbro) are identified. Considering the initial gravitational–tectonic stress field, with principal subhorizontal stresses higher than the gravitational stresses, the mathematical modeling of the stress–strain behavior in rock mass in the course of mining with sublevel caving under an ore cushion is performed. It is shown that in the give conditions, the vertical loads on rock mass in the zone of underground mining are low, and the local geomechanical situation is exclusively governed by the horizontal component of the natural stress field. During mining operations at the depth to 500 m, the maximal stresses in rockburst-hazardous rock mass are not higher than 0.4 of their uniaxial compression strength. No rockurst hazard is detected in the deposit down to the depth of 500 m below ground surface, and no dynamic phenomena of rock pressure are predicted. It is concluded that the Shanuch deposit rock mass to the depth of 500 m below ground surface, given adhesion to the project technology of mining with sublevel caving under an ore cushion is rockburst-nonhazardous.

Keywords: Rock bursts, rockburst hazard of mineral deposit, stress–strain behavior, rock mass, hybrid geotechnology, mining system, sublevel caving under ore cushion.
For citation:

Aynbinder I. I., Ovcharenko O. V., Patskevich P. G. Potential rockburst hazard on lower levels of the Shanuch deposit. MIAB. Mining Inf. Anal. Bull. 2019;(12):30-40. [In Russ]. DOI: 10.25018/0236-1493-2019-12-0-30-40.

Acknowledgements:
Issue number: 12
Year: 2019
Page number: 30-40
ISBN: 0236-1493
UDK: 622.272:622.274
DOI: 10.25018/0236-1493-2019-12-0-30-40
Article receipt date: 01.11.2019
Date of review receipt: 06.11.2019
Date of the editorial board′s decision on the article′s publishing: 10.11.2019
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,
e-mail: geoexpert@yandex.ru,
P.G. Patskevich1, Cand. Sci. (Eng.), Senior Researcher,
e-mail: ppg1975@hotmail.ru
1 Institute of Problems of Comprehensive Exploitation of Mineral Resources
of Russian Academy of Sciences, 111020, Moscow, Russia

For contacts:

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

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