Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia

A. A. Eremenko, Chief Researcher, Doctor of Engineering Sciences, Professor, yeryom@misd.ru
A. P. Khmelinin, Director, Candidate of Engineering Sciences

The geodynamic behavior of rock mass during mining of an iron ore deposit under conditions of high rockburst hazard is considered, including regional seismic activity, increased stresses in rock mass, intensification and combination of production processes, various mining systems, etc. The geomechanical behavior of the same rock mass is assessed using the regional and local methods, and the criteria of rockburst hazards are determined. The seismic hazard criterion is found for a mine located in a seismic area, including frequency of geodynamic phenomena per three months, as well as the area of rockbursting at a total seismic energy from 107 to 109 J and the seismically hazardous area. The rockburst hazard of the test rock mass was assessed after each explosion by an energy parameter defined as a ratio of seismic energy of the explosion to explosive mass. The authors analyzed the geodynamic situation during blind ore body mining on the Eastern and North-Western sites where dynamic events induced by rock pressure activated in January–February 2024. It was found how the backfill volume influenced the energy class of rock bursts. The experimental studies fixed position of a possible micro-burst, and it was pointed at an increase in the seismic energy and at a decrease in the electrometric coefficient. The magnitude of blasts increased from 2.0 to 2.7 as the mass of explosive charges grew from 2.0 to 7.2 tons. The analysis of the average annual intervals between the rock bursts of energy class 6 or higher within the space of 11 years of mining operations at the Tashtagol deposit shows that the number of days decreases, i.e. the rock mass is seismically active. In order to reduce stresses at deep levels of the test rock mass, the distress drilling charts are developed.

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